EBOM-2009 IEQp1: Minimum IAQ Performance

  • EBOM IEQp1 Diagram
  • Upgrades? No. Changes? Probably

    Meeting the LEED ventilation prerequisite is not likely to require substantial building upgrades, although it is likely to require some adjustments, such as altering minimum damper settings on existing equipment.

    An in-house engineer or a third-party vendor can help you measure outdoor air flow in each air-handling unit and compare their performance against ASHRAE Standard 62.1-2007 requirements. ASHRAE and USGBC provide calculators for determining the required rates of outdoor air flow for your building based on floor area, actual occupancy, and other characteristics of the space and ventilation distribution system. Buildings that employ older ventilation equipment or unique ventilation solutions may have one or more air handling units that are unable to meet the ASHRAE 62.1-2007 requirements. In this scenario, you can still achieve this prerequisite by showing that these air handling units provide at least 10 cubic feet per minute per person of outside air under normal operating conditions.

    Well-ventilated officeWell-ventilated space will improve occupant comfort and productivity. Photo – YRG Sustainability

    Achievable for naturally ventilated buildings

    Naturally ventilated buildings must document compliance with a special section of the ASHRAE 62.1-2007 standard, and complete some specific measurements, but this should still be highly achievable for buildings with lots of windows or a well-designed engineered natural ventilation system.

    Maintain good air quality along with energy performance

    Reducing mechanical ventilation and outdoor air intake are easy ways to reduce energy consumption, but can compromise indoor air quality if not thoughtfully executed. This prerequisite and EAp2: Minimum Energy Efficiency Performance are often seen as being in conflict with each other, but IEQp1 is designed, in part, to ensure that energy efficiency in LEED-certified buildings does not come at the expense of good indoor air quality.

    Management in actionRegular inspection and preventive maintenance on mechanical equipment will help ensure optimal airflow in your building. Photo – YRG Sustainability

    Consider these questions before pursuing this credit

    • Is the building mechanically ventilated, naturally ventilated, or mixed-mode? ASHRAE Standard 62.1-2007 addresses natural and mechanical ventilation systems using different guidelines and criteria.  Mixed-mode systems must demonstrate compliance while operating in mechanical mode only.
    • Do you have a building automation system (BAS)A building automation system (BAS) uses computer-based monitoring to coordinate, organize, and optimize building control subsystems, including lighting, equipment scheduling, and alarm reporting. that measures outdoor air? If your building does not use a BAS to monitor the rate of outside air flow through the ventilation system, manual measurements of outside air flow must be taken at each air handling unit.
    • Have the ventilation systems been tested or balanced in the last 2 years? If yes, do you have documentation on the measurements of outdoor air flow? Recent testing reports, which include ventilation rate procedure (VRP) calculations, may be used to compare measured outside air flow to the ASHRAE 62.1-2007 requirements.
    • Do occupants and building maintenance staff feel that the building is well-ventilated? Does the air seem fresh? Stuffy? Odorous? Occupant feedback is a valuable early-detection tool to know if your ventilation system is operating properly and complying with ASHRAE 62.1-2007 standards.
    • Do you have mechanical drawings that are helpful for managing ventilation systems and maintaining outdoor air flow calculations as required by ASHRAE? Do you have an HVAC preventative maintenance program? A set of accurate mechanical drawings will help you to determine where outside air flow measurements should be taken and provide manufacturer product information that can be useful in developing an ongoing preventive maintenance program to ensure proper system performance.
    • Are your engineers trained and equipped to take outdoor air flow measurements? If not, is there an engineering firm that you can use to help with these tests?

    LEED-EBOM IEQp1 FAQs

    What if after our Preliminary Review we have to re-work the ventilation rate procedure calculations and find that we need to make corrections to the system in order to meet the prerequisite? Can we redo the outside air testing after making corrections? Would we need to update the performance period for all credits accordingly?

    If for some reason you needed to make corrections to the ventilation system in order to meet the ventilation prerequisite during the review process, you could do so without having to reset the performance period for all of the performance based credits like EAp2. Outside air measurements can and must be redone to confirm that the systems meet the prerequisite after the corrections were made.

    What if our systems do not meet the required outside air when systems are tested at worst-case conditions?

    If the systems do not meet the required outside air during the initial testing the following actions should be taken:

    • If the system (damper) set points for the worst case condition can be modified to supply sufficient outside air to meet the ASHRAE 62.1-2007 requirements, the team must do so.
    • If the system is incapable of providing enough outside air to meet the ASHRAE 62.1-2007 requirements, the project can then pursue Case 2 and provide at least 10 cfm/person for those systems. Note that the team needs to supply evidence that the systems aren’t capable of meeting the ASHRAE 62.1-2007 requirements.

    Our building has a single fan that supplies outside air to multiple AHU’s. Do we need to perform outside air testing at the supply fan or at all AHUs?

    Outside air measurements need to be tested at the system level and so measurements would need to be taken at each AHU, not just the single supply fan.

    We have a VAV system where single AHUs serve multiple zones. Do we need to take outside air measurements at each VAV box?

    If a single AHU is supplying outside air to multiple zones through VAV boxes, outside air measurements need to be tested at the AHU level but not a the VAV boxes.

Legend

  • Best Practices
  • Gotcha
  • Action Steps
  • Cost Tip

Before the Performance Period

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  • For naturally ventilated buildings, follow the guidelines specified in ASHRAE 62.1-2007, Section 5.1 to assess compliance with the requirements. If your building has the proper ratio of operable windows or roof openings to floor area as described in the ASHRAE standard, you are likely to be able to show compliance. You may also show compliance by meeting the requirements of EQc1.3: IAQ Best Practices—Increased Ventilation.


  • For mechanical and mixed-mode ventilation systems, follow the guidelines specified in ASHRAE 62.1-2007, Section 6 (detailed below) and use the provided 62MZCalcs calculator to determine ASHRAE-compliant ventilation rates for each air-handling unit and zone in the building.


  • The building's original system design specifications and airflow rates are not relevant to this prerequisite. Designing a system to achieve ASHRAE compliance does not mean that the system is delivering airflow at those rates under current operating conditions.


  • Develop a ventilation maintenance program including periodic checks and system repairs.

During the Performance Period

Expand All

  • For All Options


  • Conduct a visual inspection of outside air vents, dampers, and louvers and remove any obstructions that restrict outdoor air flow.


  • Conduct airflow monitoring using manual instrumentation or a building automation system to document outdoor airflow rates. Gather data or take measurements for each air handling unit or ventilation zone; sampling is not permitted. For all VAV boxes, you’ll need to set up the ventilation system to simulate the worst-case system conditions expected during normal operations, such as minimum outside air flow due to damper position.


  • If your building automation system does not continuously measure outdoor airflow, you should still be able to measure airflow accurately by performing a duct traverse with a pitot tube. If the system’s configuration does not allow for a duct traverse (such as with curved ductwork or limited access), anemometer measures can be taken at each air handling unit.


  • Compare measured flow with required levels of outdoor air for each ventilation zone. Calculate the required outdoor air levels by completing ventilation rate procedure (VRP) calculations using the provided ASHRAE 62MZCalcs spreadsheet for each air handling unit.


  • Perform VRP calculations for all air handling units and applicable floor areas. Make sure that the floor area covered by VRP calculations matches up with the total gross floor area that is reported in your LEED application.


  • In the ASHRAE 62MZcalc spreadsheet, be sure to override the default occupancy with actual building occupancy.


  • Test all building exhaust systems to confirm that they are functioning as intended. Be sure to confirm proper function, including fan speed, voltage, control sequences, and set points.


  • Costs for testing will depend on how many air handling units and ventilation zones need testing, whether staff are qualified to do testing in-house, and whether the building has a BAS that gathers data.


  • Adjust ventilation set points if testing shows that the building is over-ventilated to save energy and reduce operational costs.


  • Increased mechanical ventilation rates may increase energy costs for heating and cooling. Some strategies for mitigating these costs include energy recovery ventilation, economizers and controls, CO2 monitors, and demand-controlled ventilation.


  • Good indoor air quality can lower operational costs while increasing occupant health and productivity as well as the value and marketability of the building.


  • Case 1: Projects Able to Meet ASHRAE Standard 62.1-2007


  • Demonstrate that each air handling unit supplies the minimum outdoor air flow specified by ASHRAE 62.1-2007. If one or more air handling units do not meet the ASHRAE requirements, you can still earn the prerequisite by using the EQp1 Option B Calculator to show that those units supply at least 10 cfm per person.


  • Case 2: Projects Unable to Meet ASHRAE Standard 62.1-2007 Due to Physical Constraints


  • Demonstrate that it is not feasible to meet ASHRAE 62.1-2007 because of building design and construction. Also, demonstrate that at least 10 cfm per person of outdoor air is supplied under normal operating conditions. Projects able to demonstrate both of these items can earn the prerequisite, even though they don’t provide optimal indoor air quality.


  • Use the EQp1 Option B calculator for all air handling units that are unable to provide the minimum outdoor air flows required by ASHRAE 62.1-2007.

  • USGBC

    Excerpted from LEED 2009 for Existing Buildings: Operations & Maintenance

    IEQ Prerequisite 1: Minimum indoor air quality performance

    Required

    Intent

    To establish minimum indoor air quality (IAQIndoor air quality: The quality and attributes of indoor air affecting the health and comfort building occupants. IAQ encompasses available fresh air, contaminant levels, acoustics and noise levels, lighting quality, and other factors.) performance to enhance indoor air quality in buildings, thus contributing to the health and well-being of the occupants.

    Requirements

    Case 1. Projects able to the standard
    OPTION 1. ASHRAE Standard 62.1-2007 or Non-U.S. Equivalent

    Modify or maintain each outside air intake, supply air fan and/or ventilation distribution system to supply at least the outdoor air ventilation rate required by ASHRAE Standard 62.1–2007 ventilation rate procedure (with errata but without addenda ) under all normal operating conditions. Projects outside the U.S. may use a local equivalent to ASHRAE Standard 62.1-2007 for breathing zoneThe breathing zone is the region within an occupied space between 3 and 6 feet above the floor and more than 2 feet from walls or fixed air-conditioning equipment. (AHSRAE 62.1–2007) minimum ventilation rates.

    OPTION 2. CEN Standard EN 15251: 2007

    Projects outside the U.S. may modify or maintain each outside air intake, supply air fan and/or ventilation distribution system to supply at least the outdoor air ventilation rate required by Annex B of Comité Européen de Normalisation (CEN) Standard EN 15251: 2007, Indoor environmental input parameters for design and assessment of energy performance of buildings addressing indoor air quality, thermal environment, lighting and acoustics.

    Case 2. Projects unable to meet the standard

    If meeting the ventilation rates required of the above standards is infeasible because of the physical constraints of the existing ventilation system, modify or maintain the system to supply at least 10 cubic feet per minute (cfm) (5 liters per second) of outdoor air per person under all normal operating conditions. Demonstrate through design documentation, measurements or other evidence that the current system cannot provide the flow rates required by the above standards under any operating condition even when functioning properly.

    Each air-handling unit in the building must comply with either Case 1 or Case 2. If some airhandling units can provide the outside air flow required by the above standards and others cannot, those that can must do so. Buildings must provide at least 10 cfm (5 liters per second) per person of outside air at each air-handling unit under all normal operating conditions to earn this prerequisite.

    • Show compliance with the applicable requirement above (Case 1 or Case 2) through measurements taken at the system level (i.e., the air-handling unit). For variable air volume systems, the dampers, fan speeds, etc. must be set during the test to the worstcase system conditions (minimum outside air flow) expected during normal ventilation operations. Each air-handler must be measured; sampling or grouping of air-handlers is prohibited.
    • Implement and maintain an HVAC system maintenance program to ensure the proper operations and maintenance of HVAC components as they relate to outdoor air

      introduction and exhaust.
    • Test and maintain the operation of all building exhaust systems, including bathroom, shower, kitchen and parking exhaust systems.

    Naturally ventilated buildings must comply with ASHRAE Standard 62.1-2007, paragraph 5.1(with errata but without addenda1).

    Credit substitution available

    You may use the LEED v4 version of this credit on v2009 projects. For more information check out this article.

    Potential Technologies & Strategies

    Conduct a visual inspection of outside air vents and dampers and remove any outside air vent or louver obstructions that restrict full outside air capacity from entering the distribution system. Conduct airflow monitoring to document outside air cubic feet per minute (cfm). Compare measured flow with designed flow for each unit. Test the operation of each exhaust fan and verify that exhaust airflow meets design requirements or intentions. EPA’s “Guidelines for HVAC System Maintenance” provides guidance on developing, implementing and maintaining an HVAC system maintenance program to ensure the proper operations and maintenance of HVAC components as they relate to IAQIndoor air quality: The quality and attributes of indoor air affecting the health and comfort building occupants. IAQ encompasses available fresh air, contaminant levels, acoustics and noise levels, lighting quality, and other factors..

Technical Guides

IEQ Space Matrix - 2nd Edition

This updated version of the spreadsheet categories dozens of specific space types according to how they should be applied under various IEQ credits. This document is essential if you have questions about how various unique space types should be treated. Up to date, 2nd Edition.


Chartered Institution of Building Services Engineers (CIBSE) Applications Manual 10: 2005, Natural Ventilation in Non-Domestic Buildings

This is a best-practice design guide to natural ventilation.


IEQ Space Matrix - 1st Ed.

This spreadsheet categories dozens of specific space types according to how they should be applied under various IEQ credits. This document is essential if you have questions about how various unique space types should be treated.  This is the 1st edition.

LEED Gold Project Documentation

Complete LEED Online documentation for achievement of IEQp1 on a certified Gold LEED-EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems. 2009 project in Denver, Colorado.

Non-Compliant AHU Form

Case 2: Projects Unable to Meet ASHRAE Standard 62.1-2007 Due to Physical Constraints

A form like this will be needed for all AHUs that are not capable of meeting the outdoor airflow required by ASHRAE 62.1-2007; these AHUs must provide a minimum of 10 cfm in order to meet the prerequisite.

Ventilation System Maintenance

All Options

Use logs or status reports to document preventive maintenance of ventilation systems.

Exhaust Systems Testing

You can use the form provided as a checklist for testing exhaust systems, and for recording results.

IEQp1 LEED Online Form

Use these LEED Online screen captures with annotated tips from LEEDuser to help you fill out this form.

LEED Online Forms: LEED-EBOM IEQ

The following links take you to the public, informational versions of the dynamic LEED Online forms for each EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems.-2009 IEQ credit. You'll need to fill out the live versions of these forms on LEED Online for each credit you hope to earn.

v06 forms (newest):

v04 forms:

v03 forms:

These links are posted by LEEDuser with USGBC's permission. USGBC has certain usage restrictions for these forms; for more information, visit LEED Online and click "Sample Forms Download."

328 Comments

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Michael Smithing Director - Green Building Advisory Colliers International
Oct 14 2014
LEEDuser Member
2264 Thumbs Up

Error - ours or v5 form

Project Location: Bulgaria

We have a building with 57 AHU1.Air-handling units (AHUs) are mechanical indirect heating, ventilating, or air-conditioning systems in which the air is treated or handled by equipment located outside the rooms served, usually at a central location, and conveyed to and from the rooms by a fan and a system of distributing ducts. (NEEB, 1997 edition) 2.A type of heating and/or cooling distribution equipment that channels warm or cool air to different parts of a building. This process of channeling the conditioned air often involves drawing air over heating or cooling coils and forcing it from a central location through ducts or air-handling units. Air-handling units are hidden in the walls or ceilings, where they use steam or hot water to heat, or chilled water to cool the air inside the ductwork. each supplying 100% OA. We are documenting IEQp1 with the Appendix - 100% outdoor air.

We have entered the actual density in each zone and the form calculates Voz for IEQp1 and IEQc1.3 compliance. In each case, the measured airflow exceeds the IEQc1.3 requirements yet the summary tables (in the form and in the Appendix) show an "N" for compliance with both IEQp1 and IEQc1.3.

Has anyone encountered a similar problem? Is there an error in the form or are we missing something? Does the form do any other checks (e.g. Pz < Default) that are not documented?

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Jeannie Rueter Green Building Analyst Ausonio Incorporated
Oct 08 2014
LEEDuser Member

EB v2.0 questions

Project Location: United States

I’m working on responding to Technical Advice for a 24,000 sf building with office and warehouse spaces that is registered in EB 2.0. The building is a mix of leased spaces and spaces occupied by the owner.

Test and Balance was done in 2011 on all of the space conditioning units and exhaust systems except one split system in a leased warehouse space. The tenant had built an office/server space with no ceiling in a corner of the warehouse and the split system was in there to keep his server cool. The air intake was in the warehouse, not on the outside of the building. The space was locked and the tenant was not available for the TAB.

The split system was listed as one of the conditioning units in the building. Now the tenant with the split system moved out, the space was repurposed as construction supplies storage and is naturally ventilated by a roll up door and the split system and the office are no longer in the space.

There was also a new heating unit installed in another space when a new tenant moved in. They moved in after the TAB was done but are included in other credits with performance periods and the heater is in the list of conditioning units.

The Technical Advice is questioning if all conditioning units were reported. How do I address these two systems in the response? Is the split system just no longer applicable ? Does the owner need to do a TAB on the new heater and report the findings for this credit?

Thanks for your help.

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Diego Pietzsch Mechanical Engineer
Sep 04 2014
Guest
9 Thumbs Up

Natural Ventilation in a Warehouse

How can a large Warehouse that uses natural ventilation system, but does not meet the requirements of ASHRAE 62.1-2007 section 5.1 be able to pass under the LEED EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems. IEQp1? Is it possible to use simulation as an alternative for proving ventilation levels compliance?

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Ivan Souza Sustainability Consultancy Services, Cushman & Wakefield Sep 05 2014 LEEDuser Member 879 Thumbs Up

Hi Diego,

you can prove through the sizing calculation of natural ventilation warehouse system.

In a warehouse the idea is to remove heat through the chimney effect.

Take a look at the ASHRAE 62.1 User Manual, which talks about Enginnered Ventilation System.

Regards

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Julia Weatherby Senior Mechanical Engineer, Lindgren & Sharples, P.C. Sep 05 2014 LEEDuser Member 1571 Thumbs Up

Diego-
You could use any of the natural ventilation analysis techniques discussed under the EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems. IEQ credit 1.3 Increased Ventilation to document adequate ventilation, even if you are not going for the Increased Ventilation credit.

Refer to the IEQ Credit 1.3 section of the EBOM 2009 reference guide or to that credit on LEED User.

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Ivan Souza Sustainability Consultancy Services Cushman & Wakefield
Sep 03 2014
LEEDuser Member
879 Thumbs Up

Occupancy Doubt

Hi everyone,

i'm working in a office building that will be certified. I've a doubt about the occupancy to consider.

One of the floors will have a new tenant, which has much higher than projected occupancy, making the equipment impossible to meet the standard, and impacting on the heat load.

The new tenant will have classrooms.

How can I consider the amount of occupants in a classroom? Consider that is unable to determine how many students have for each class.

Can i consider it the peak of occupation?

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Julia Weatherby Senior Mechanical Engineer, Lindgren & Sharples, P.C. Sep 03 2014 LEEDuser Member 1571 Thumbs Up

For the EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems. rating system, you are supposed to use "the maximum number of people expected to occupy the zone during typical usage."

Here's what the LEED Tips for EBOM 2009 says: "Remember that all values of occupancy used to define minimum outside airflow requirements must be based on the maximum occupancy expected during normal facility operation and not on design occupancy, minimum occupancy, or unusual or emergency conditions. According to the Reduced Occupancy Guidance for LEED for Existing Buildings, the default values for occupancy listed in ASHRAE standard 62.1-2007 should be used only for completely vacant spaces."

This means that you should consider "normal" building usage and use an occupancy value that would be considered maximum during actual "normal" or "typical" conditions. That's not an average, but it's also not the absolute peak that might occur during an extraordinary circumstance.

If this occupancy level causes an issue for you, you could look at averaging techniques from Section 6.2.6.2 of ASHRAE 62.1-2007. The reference guide does say you can use those averaging techniques if the expected number of occupants fluctuates. That probably wouldn't help much though, as that kind of averaging makes more difference for spaces like lobbies with high ceilings and peak occupancies that may last only 15 minutes, than for a classroom with a normal height ceiling where the peak occupancy is closer to an hour or so. The time "T" over which you can average the occupancy is obtained from the equation, T=3v/Vbz, where
T=averaging time in minutes
v=volume of the zone in cubic feet
Vbz=the breathing zoneThe breathing zone is the region within an occupied space between 3 and 6 feet above the floor and more than 2 feet from walls or fixed air-conditioning equipment. (AHSRAE 62.1–2007) outdoor airflow calculated for the typical maximum people OA rate plus the area OA rate

For example, for a 900 square foot classroom with a 9 foot high ceiling and a typical maximum of 30 occupants:
v = 900 sf x 9 ft = 8,100 cubic feet
Vbz = (10 cfm/person x 30 people) + (0.12 cfm/sf x 900 sf) = 408

T = 3v/Vbz = 60 minutes
(which does you no good if typical classes are 1 hour or longer)

For EBOM, you should be basing your calculations on a performance period that occurs over a time period during which the building is occupied. This means that you or the building owner or tenant should be able to observe the classrooms during actual usage to determine what the "typical" maximum occupancies are.

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Janna Nash
Aug 06 2014
LEEDuser Member
537 Thumbs Up

Exhaust Fans in Production area

For LEED EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems. 2009, IEQp1, are exhaust fan test reports required for every fan or just one per type. We have 4 restrooms with an exhaust fan in each and then 4 industrial size exhaust fans in the production area that move air from inside the building to outside to help with air circ in summer. This production area is not air conditioned. Could you also tell me the best type of equipment to use for measuring outdoor airflow at the HVAC units. This project has six HVAC units to cool the office areas and computer rooms - just simple residential-size 4-5 ton split units, so I need to describe to contractor what tool to use and where to take the measurement. Readings are not required at diffusersIn an HVAC context, diffusers disperse heating, cooling, or ventilation air as it enters a room, ideally preventing uncomfortable direct currents and in many cases, reducing energy costs and improving indoor air quality (IAQ). In light fixtures, diffusers filter and disperse light./vents, correct? Thanks for any help you can pass on quickly as we wrap up this project!

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Janna Nash Aug 11 2014 LEEDuser Member 537 Thumbs Up

Clarification: Contractor came to take Outdoor Air measurements and we found the small HVAC units for our project building do not have fresh air intake. Can I comply with this IEQ prerequisite? And how?

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James Doyle Owner ConServe
Jul 31 2014
LEEDuser Member
103 Thumbs Up

EBOM IEQp1-A1 Statement "Would need over 100% OA Intake"

Our EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems. 2009 project credit data has to be completed by 8-5 and I am getting a message "Would need over 100% OA Intake" at the end of the IEQp1-A1 VAVVariable Air Volume (VAV) is an HVAC conservation feature that supplies varying quantities of conditioned (heated or cooled) air to different parts of a building according to the heating and cooling needs of those specific areas. data input form. All values look good with the measured OA intake to the AHU1.Air-handling units (AHUs) are mechanical indirect heating, ventilating, or air-conditioning systems in which the air is treated or handled by equipment located outside the rooms served, usually at a central location, and conveyed to and from the rooms by a fan and a system of distributing ducts. (NEEB, 1997 edition) 2.A type of heating and/or cooling distribution equipment that channels warm or cool air to different parts of a building. This process of channeling the conditioned air often involves drawing air over heating or cooling coils and forcing it from a central location through ducts or air-handling units. Air-handling units are hidden in the walls or ceilings, where they use steam or hot water to heat, or chilled water to cool the air inside the ductwork. exceeding the required minimum amount. What does the over 100% OA statement mean? We are using the V4 form.

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Ilona Johnson, PE, CEM, LEED AP Associate, Lilker EMO Energy Solutions Jul 30 2014 Guest 290 Thumbs Up

Look for the zone in purple italics in the calculator. Is it getting enough ventilation? Your "critical zone" may be under ventilated.

Also, which cell is this message showing up in? If it's showing up in row 43 of the USGBC version of the ASHRAE calculator, it may mean that you meet the prerequisite minimum OA, but not the 30% increased OA for IEQc2.

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James Doyle Owner, ConServe Jul 30 2014 LEEDuser Member 103 Thumbs Up

Ilona,
I am referring to the LEEDonline "VRP Compliance Calculator" found in Appendix 1 of the V4 data entry form. We are not using the ASHRAE calculator "62MZCalc". The critical zone had a Zp of 0.99 so I changed some values an now the highest Zp is 0.93. The note is removed when I hit recalculate but comes back when I reload the saved form!! :-(

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James Doyle Owner ConServe
Jul 17 2014
LEEDuser Member
103 Thumbs Up

Can ebom 2009 use IEQp1 v3 forms?

Our EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems. 2009 project (registered in late 2011 or early 2012) Score Card indicates that for IEQp1 we are to use the v4 form. I thought we could use the v3 form which may not require us to display the VRP Compliance Calculator. I realize we have to comply with the calculator and have it available if LEED wants to see the calculations. 85% of the systems are constant volume and there are 2 VAVVariable Air Volume (VAV) is an HVAC conservation feature that supplies varying quantities of conditioned (heated or cooled) air to different parts of a building according to the heating and cooling needs of those specific areas. systems (with non recirculating boxes) that are being tested for total OA flow at worst case winter conditions. Is it not easier to document IEQp1 with the v3 form than the v4 form? If we can use the v3 forms how do we get LEED to change the Score Card from v4 to v3?

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Jay Murray LEED Administrator Commercial Construction Consulting
Jul 16 2014
LEEDuser Member
155 Thumbs Up

10 cfm per person rule

I have a small tenant spaceTenant space is the area within the LEED project boundary. For more information on what can and must be in the LEED project boundary see the Minimum Program Requirements (MPRs) and LEED 2009 MPR Supplemental Guidance. Note: tenant space is the same as project space. in a large high rise commercial building. 100% outdoor air is supplied down a shaft, each floor has a main heat pumpA type of heating and/or cooling equipment that draws heat into a building from outside and, during the cooling season, ejects heat from the building to the outside. Heat pumps are vapor-compression refrigeration systems whose indoor/outdoor coils are used reversibly as condensers or evaporators, depending on the need for heating or cooling. In the 2003 CBECS, specific information was collected on whether the heat pump system was a packaged unit, residential-type split system, or individual room heat pump, and whether the heat pump was air source, ground source, or water source. which mixes that outdoor air with return air from the floor (40% OA, 60% RA). That mixed air is conditioned by the main floor heat pump and supplied to our space (the sensor for the main heat pump is located within our open office space). The interior of this space (mostly open office) has diffusersIn an HVAC context, diffusers disperse heating, cooling, or ventilation air as it enters a room, ideally preventing uncomfortable direct currents and in many cases, reducing energy costs and improving indoor air quality (IAQ). In light fixtures, diffusers filter and disperse light. serving it directly from that supply duct, while the perimeter spaces (2 conference rooms and some perimeter offices are fed from smaller heat pumps located above the ceiling with the 40/60 main heat pump supplying air into the back of the individual heat pumps. My question is this: the space as a whole is supplied 2,730 cfm from main floor heat pump, of that amount 40% is equal to 1,100 cfm of outdoor air. This office employs 35 people max, but when you add up the conference rooms and consider all of the offices occupied, the occupancy goes as high as 55 people (taking zero diversity). 55 times 10 cfm per person is 550 cfm, exactly 1/2 of what we are supplying. I noticed that one conference room only has 120 cfm going to the back of it's local heat pump which is NOT enough outdoor air per ASHRAE 62 for a room with 8 people. Will USGBC allow me to look at the space as a whole, or do I need to prove that every space within it meets the 10 cfm threshold even though we are supplying twice the required amount of outdoor air into the entire space?

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Ilona Johnson, PE, CEM, LEED AP Associate, Lilker EMO Energy Solutions Jul 16 2014 Guest 290 Thumbs Up

I started to respond based on Case A, but then I realized you are mentioning the 10 cfm because you are pursuing Case B. But I'm curious about the context. If you are providing two times the required 10 cfm per person, then you are providing 20 cfm per person. What is the area of your space? With 20 cfm per person, I'm curious if Case B is appropriate. You may be close to meeting ASHRAE 62.1 requirements in other spaces excluding this one conference room.

I once tried submitting Case B on a project, but then the reviewer came back and said we should make minor modifications to meet Case A. This might mean rebalancing air supply in certain spaces such as your conference room that receive insufficient ventilation...

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Jerry Scott
Apr 09 2014
Guest
60 Thumbs Up

Design Condition

I assume both Vpsd and Vdzd should both be taken at a set design condition (cooling or heating). I received the following GBCI comment:

"The Vdzd values should be the maximum design values and the other variables noted shall be modified to appropriately represent the worst-case condition. It is not clear whether the design cooling, or design heating condition (primary plus local recirculated air) represents the maximum supply to the zone."

This seems to imply the Vdzd values should be for the greatest of heating or cooling, and the condition might not be the same for every zone.

Is my original thought correct that Vpsd and Vpzd should always be evaluated under the same design condition?

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Ali Stricks
Apr 08 2014
Guest
32 Thumbs Up

Public Corridors Lack Ventilation

I’m dealing with a building that generally meets ASHRAE 62.1, however several public corridors are unconditioned and unventilated. The corridors do not have the minimum 0.06 cm/sf required per ASHRAE 62.1. I want to ensure the building meets prereq requirements, but I also want to avoid suggesting unnecessary and costly changes in the air distribution system. I have the following questions:
1) All AHUS could comply through Case B by providing at least 10 cfm per person. However, I’m unclear on the circumstances in which a reviewer will accept Case B in place of Case A. Would the reviewers come back and say we need to add supply registers in the corridor?
2) Several corridors are flanked on both sides by offices with outdoor air flow rates that exceed ASHRAE 62.1. Could I claim “credit” for air mixing from adjacent rooms?

Thanks in advance!

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Julia Weatherby Senior Mechanical Engineer, Lindgren & Sharples, P.C. Apr 11 2014 LEEDuser Member 1571 Thumbs Up

1) I don't think the reviewer would require that you add ductwork or diffusersIn an HVAC context, diffusers disperse heating, cooling, or ventilation air as it enters a room, ideally preventing uncomfortable direct currents and in many cases, reducing energy costs and improving indoor air quality (IAQ). In light fixtures, diffusers filter and disperse light. to a system to comply with Case A.
2) If there are no closed doors between the offices and the corridors, it might be reasonable to divide the corridors into parts to be included in the same ventilation zone with an adjacent office. In this case the square footage area of the office zone would be increased but the population would not be increased; the entire area would be defined as "office" for purposes of the ventilation calculations. This would model the air supplied to the office as being shared between the office and its adjacent circulation corridor.

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Noriko Yasuhara Woonerf Inc.
Apr 02 2014
LEEDuser Member
1794 Thumbs Up

Measurement at DOAS before fixed dampers

From the reference guide: "Show compliance with the applicable requirement above through measurements taken at the system level (i.e., the air-handling unit). For variable air volume systems, the dampers, fan speeds, etc. must be set during the test to the worst-case system conditions (minimum outside air flow) expected during normal ventilation operations. Each air-handler must be measured; sampling or grouping of air-handlers is prohibited."

The building we are working with has a DOAS - dedicated outdoor air system, that supplies OA to three meeting rooms, the pipes that go to each room have fixed dampers that were regulated during the HVAC test and balance. Is our understanding correct to say that the measurements must be made at the system level even when there are fixed dampers are set near the diffusersIn an HVAC context, diffusers disperse heating, cooling, or ventilation air as it enters a room, ideally preventing uncomfortable direct currents and in many cases, reducing energy costs and improving indoor air quality (IAQ). In light fixtures, diffusers filter and disperse light.?

Thanks in advance,

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Julia Weatherby Senior Mechanical Engineer, Lindgren & Sharples, P.C. Apr 11 2014 LEEDuser Member 1571 Thumbs Up

Because your system is 100% outdoor air (no recirculation), I imagine it would be acceptable to add together the air flows at each supply air register. I assume it is easier for you to make the measurements at the air outlets than at the air handling unit outdoor air inlet. You can include a narrative in the Special Circumstances section or the Alternative Compliance section noting that the ductwork routing was confirmed and that airflow was measured at all outlets of the 100% outdoor air system. Theoretically, the sum of the air outlets should be equal to the outdoor air inlet at the AHU1.Air-handling units (AHUs) are mechanical indirect heating, ventilating, or air-conditioning systems in which the air is treated or handled by equipment located outside the rooms served, usually at a central location, and conveyed to and from the rooms by a fan and a system of distributing ducts. (NEEB, 1997 edition) 2.A type of heating and/or cooling distribution equipment that channels warm or cool air to different parts of a building. This process of channeling the conditioned air often involves drawing air over heating or cooling coils and forcing it from a central location through ducts or air-handling units. Air-handling units are hidden in the walls or ceilings, where they use steam or hot water to heat, or chilled water to cool the air inside the ductwork.. Even considering duct leakage, the sum of the outlets would be expected to be less than or equal to the OA inlet at the AHU, so demonstrating compliance by measuring the sum of the air outlets should be a valid method in a 100% outdoor air system.

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Tom Dietsche LEED Project Manager Lilker EMO Energy Solutions
Mar 31 2014
LEEDuser Member
232 Thumbs Up

Local code more stringent than ASHRAE 62.1

I noticed that the LEED EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems. form does not have the same compliance path as LEED-NC, which allows you to document that your building complies with local code that is more stringent than ASHRAE 62.1. Has anyone ever tried the "local code" compliance path for an EBOM project?

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Hernando Miranda Owner, Soltierra LLC Apr 01 2014 Guest 7686 Thumbs Up

Hello Tom,

I have not done an EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems. project, but proving local code is more stringent than ASHRAE 62.1 is quite a pain.

If you are challenged, the reviewers will ask you have to analyze your project using both methods and identify the most stringent conditions. This might appear to mean doing a side-by-side analysis on a space-by-space and a system-by-system basis. But, on the single occasion where a reviewer challenged me about local code for ventilation, I did not provide a side-by-side analysis. I provided two separate analyses which each showed compliance.

A side-by-side analysis doesn't really prove anything because the calculation methodologies and assumptions used are often very different--apples and oranges.

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tiantian zhou
Mar 25 2014
LEEDuser Member
223 Thumbs Up

VRP calculations for fan-powered boxes using 62MZ calc

Our system has fan-powered VAVVariable Air Volume (VAV) is an HVAC conservation feature that supplies varying quantities of conditioned (heated or cooled) air to different parts of a building according to the heating and cooling needs of those specific areas. boxes. The first review comments required us to use 62MZ calc to account for local recirculation. But we have 120 AHUs and hundreds of zones. One 62MZ calc excel file only can calculate one system which means we have to fill and upload 120 excel file. is it right and terrible?
what should I do?
The 62MZ calc sheet is not so smart and convenient. we are looking forward to more smart calculation sheet.

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Julia Weatherby Senior Mechanical Engineer, Lindgren & Sharples, P.C. Apr 11 2014 LEEDuser Member 1571 Thumbs Up

You probably have to submit 120 Excel files. However, you do not have to fill out every zone for every AHU1.Air-handling units (AHUs) are mechanical indirect heating, ventilating, or air-conditioning systems in which the air is treated or handled by equipment located outside the rooms served, usually at a central location, and conveyed to and from the rooms by a fan and a system of distributing ducts. (NEEB, 1997 edition) 2.A type of heating and/or cooling distribution equipment that channels warm or cool air to different parts of a building. This process of channeling the conditioned air often involves drawing air over heating or cooling coils and forcing it from a central location through ducts or air-handling units. Air-handling units are hidden in the walls or ceilings, where they use steam or hot water to heat, or chilled water to cool the air inside the ductwork.. You can make a judgement as to which zones are likely to be critical zones and include only those zones if that is helpful. However, when you have only a few zones served by an AHU, it is probably easiest to include all the zones for that AHU so you do not have to override any of the system variables.
If some of your AHU's are similar to each other, you could at least copy a completed Excel file and edit for any differences rather than starting from scratch with each AHU.

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Noriko Yasuhara Woonerf Inc.
Mar 20 2014
LEEDuser Member
1794 Thumbs Up

Ez for projects unable to meet ASHARE 62.1-2007?

Hello.

Is it necessary to consider the zone air distribution effectiveness (Ez) for projects unable to meet ASHARE 62.1-2007 when calculating 10cfm/person minimum ventilation?

Thanks in advance,

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Julia Weatherby Senior Mechanical Engineer, Lindgren & Sharples, P.C. Mar 21 2014 LEEDuser Member 1571 Thumbs Up

No, you do not need to consider Ez for air handling units unable to meet ASHRAE 62.1-2007. The 10 cfm/person is as measured at the AHU1.Air-handling units (AHUs) are mechanical indirect heating, ventilating, or air-conditioning systems in which the air is treated or handled by equipment located outside the rooms served, usually at a central location, and conveyed to and from the rooms by a fan and a system of distributing ducts. (NEEB, 1997 edition) 2.A type of heating and/or cooling distribution equipment that channels warm or cool air to different parts of a building. This process of channeling the conditioned air often involves drawing air over heating or cooling coils and forcing it from a central location through ducts or air-handling units. Air-handling units are hidden in the walls or ceilings, where they use steam or hot water to heat, or chilled water to cool the air inside the ductwork. outdoor intake.
However, you do need to evaluate each AHU separately to determine whether it can meet ASHRAE 62.1-2007, prior to using the 10 cfm/person alternative. You may need to submit some AHU's through the ASHRAE 62.1-2007 path while others in the same building use the 10 cfm/person route.

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Noriko Yasuhara Woonerf Inc. Mar 23 2014 LEEDuser Member 1794 Thumbs Up

Thank you very much, Julia!

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Noriko Yasuhara Woonerf Inc.
Mar 17 2014
LEEDuser Member
1794 Thumbs Up

Pz - Zone Population real vs default occupant density

Hello.

On 6.2.2.1 Breathing ZoneThe breathing zone is the region within an occupied space between 3 and 6 feet above the floor and more than 2 feet from walls or fixed air-conditioning equipment. (AHSRAE 62.1–2007) Outdoor Airflow, I read "Note: If Pz cannot be accurately predicted during design, it shall be an estimated value based on the zone floor area and the default occupant density listed in Table 6-1."

For existing buildings as well, Pz shall be calculated using actual occupancy, instead of calculated using the default density?

Thanks in advance,

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Ilona Johnson, PE, CEM, LEED AP Associate, Lilker EMO Energy Solutions Mar 17 2014 Guest 290 Thumbs Up

Hi Noriko,
Your calculations are supposed to be based on actual occupancy for this credit.

From a code perspective for new construction projects, you should use the actual number of occupants if known, and use the ASHRAE default occupants if the number is unknown. However, if you are documenting this credit for the LEED EB rating system, then you can always take a count of the occupants in the building. LEED reviewers expect you to use the actual number of people in the building to estimate outdoor air requirements. Ensure your occupant count is consistent with the occupants reported for all other credits.

I hope that helps!

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Noriko Yasuhara Woonerf Inc. Mar 20 2014 LEEDuser Member 1794 Thumbs Up

Thank you Ilona!

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Katie Raymond Sustainability Project Manager DTZ
Mar 11 2014
LEEDuser Member
36 Thumbs Up

CO2 sensors located in the return duct

I noticed Ben's comment below from February 10th,

"Also, if the CO2Carbon dioxide sensors are located in the return duct, the review team will likely request justification for how those sensors are accurately accounting for the CO2 in the breathing space of the occupied spacesOccupied Spaces are defined as enclosed spaces that can accommodate human activities. Occupied spaces are further classified as regularly occupied or non-regularly occupied spaces based on the duration of the occupancy, individual or multi-occupant based on the quantity of occupants, and densely or non-densely occupied spaces based upon the concentration of occupants in the space.."

Funny, I just got that exact comment back last week. I'm wondering, Ben, what type of justification could a team provide in this scenario? If we've already set up the calculations and testing to reflect the scenario where the potentially critical zones are fully occupied and the fans and outside air dampers are set to the lowest point, haven't we already demonstrated that the AHUs can push enough outside air to satisfy ASHRAE 62.1?

It seems this comment relates to IEQc1.2, which we are not pursuing.

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Hannah Bronfman Sustainability Consultant, YR&G Mar 11 2014 LEEDuser Expert 1388 Thumbs Up

Hi Katie

I think the review team is just asking you to confirm that you are aware that the CO2Carbon dioxide sensors are in place and that you understand the implications that the sensors have on your system and the associated OA flow rates. But more so, they are testing you to see if you have adequately accounted for the sensors during testing.

So I think all you need to do is provide a narrative confirming that your approach took into account the above considerations and then include the narrative you began regarding your specific "calculations and testing to reflect the scenario where the potentially critical zones are fully occupied and the fans and outside air dampers are set to the lowest point." Use enough detail so that the review team is aware of your understanding of the implications.

Good luck!

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Ilona Johnson, PE, CEM, LEED AP Associate, Lilker EMO Energy Solutions Mar 29 2014 Guest 290 Thumbs Up

I saw a similar comment on a LEED CI project, and the reviewer stated that CO2Carbon dioxide sensors in the return duct do not meet ASHRAE 62.1. They were concerned that CO2 sensors in the return duct report an average CO2 level, but do not report the CO2 concentration in worst case zones. The problem is that a return CO2 sensor could report a CO2 concentration that is lower than the space concentration in a densely packed conference room. If the building automation system reduces the outdoor air supply based on the return CO2 sensor, it could be starving the conference room of required outdoor air.

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Ilona Johnson, PE, CEM, LEED AP Associate Lilker EMO Energy Solutions
Mar 06 2014
Guest
290 Thumbs Up

One outside air intake for multiple AHUs

Has anyone had experience documenting IEQp1 in the following situation?:
I recently visited a facility that has one outdoor air intake for multiple AHUS. A single duct dumps outside air into a mechanical room on each floor. The mechanical rooms have 1-3 AHUS. The mechanical room acts as a mixing box that mixes outside air and return air. Based on the arrangement of units, I am confident that the air is fully mixed. Each air handling unit should receive a proportional amount of outside air. So in cases where there are 2 identical AHUS, each AHU should receive ½ of the outside air delivered into the mechanical room. I could potentially measure the airflow at the outside air supply and divide by 2, but I’m not sure how LEED reviewers would feel about it. The other alternative would be to add additional ductwork that directly ducts outside air to each AHU; however this seems to be an unnecessary expenditure. Has anyone had experience with this situation

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David Hubka Director - Operations, Transwestern Sustainability Services Mar 06 2014 LEEDuser Expert 996 Thumbs Up

We've done a project similar to yours and , through a calculation as you described, we prorated the amounts of outside air to each AHU1.Air-handling units (AHUs) are mechanical indirect heating, ventilating, or air-conditioning systems in which the air is treated or handled by equipment located outside the rooms served, usually at a central location, and conveyed to and from the rooms by a fan and a system of distributing ducts. (NEEB, 1997 edition) 2.A type of heating and/or cooling distribution equipment that channels warm or cool air to different parts of a building. This process of channeling the conditioned air often involves drawing air over heating or cooling coils and forcing it from a central location through ducts or air-handling units. Air-handling units are hidden in the walls or ceilings, where they use steam or hot water to heat, or chilled water to cool the air inside the ductwork.. The LEED reviewer approved this method. We were not required to duct the OA to each AHU.

It may be wise to include a narrative/photo to help illustrate your method.

Good Luck!

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Cheryl Burkinshaw
Mar 04 2014
LEEDuser Member
267 Thumbs Up

EZ

I am working on a small project with a design team that is fairly new to LEED. We are working on IEQ P1 and would like to find some direction on selecting the correct EZ value to be used in table IEQp1-A2. We have been using the 0.8 value as a default but would like to know for sure if that is correct. Thanks in advance.

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Dylan Connelly Mechanical Engineer, Integral Group Mar 04 2014 LEEDuser Expert 7075 Thumbs Up

Depends on your distribution style. Overhead diffusersIn an HVAC context, diffusers disperse heating, cooling, or ventilation air as it enters a room, ideally preventing uncomfortable direct currents and in many cases, reducing energy costs and improving indoor air quality (IAQ). In light fixtures, diffusers filter and disperse light. and return overhead is 0.8.
Julia Weatherby describes how to find out your Ez in detail below.

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Noriko Yasuhara Woonerf Inc. Mar 17 2014 LEEDuser Member 1794 Thumbs Up

Cheryl,

Check table 6-2 on ASHRAE 62.1 2007.

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Omar Delgado Mechanical Engineer EnerMech
Mar 04 2014
LEEDuser Member
184 Thumbs Up

Ventilation rates for manufacturing facilities

I'm analyzing a manufacturing plant which is 70% manufacturing space and 30% warehouse. Do I need to follow the ACGIH Industrial Ventilation Manual to comply with this credit ?

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Christina Reeves Principal Environmental Specialist Progressive Associates
Feb 13 2014
LEEDuser Member
111 Thumbs Up

Using the calculator (continued)

Hello again,
We now have the 62MZ spreadsheet working (thanks again!), but a few more questions have come up as our ME works through it. Can anyone provide some insight on these?
1. If we are analyzing a constant volume system serving a large arena seating area, do we enter only one zone for the entire area served?
2. Under the section, Inputs for Operating Condition Analyzed, there are no instructions for the pull down menu codes for “Air distribution type at conditions analyzed”. Where can we find the definitions for these codes?
3. If many different ventilation systems are being analyzed, is it best to create a new file for each unit?

Thank you!

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Julia Weatherby Senior Mechanical Engineer, Lindgren & Sharples, P.C. Feb 13 2014 LEEDuser Member 1571 Thumbs Up

Christina-

1. The "MZ" in 62MZ means multi-zone, so it isn't normally used for single zone constant volume systems (just for multi-zone recirculating systems). A simple excel spreadsheet or even just filling in the table in the LEED form should work fine for a constant volume single zone system serving a large arena seating area. It might work to just put in one zone in the 62MZ calculator, but I think it requires a minimum of 2 zones.

2. If you have the USGBC LEED version of the 62MZ calculator, there should be a button to click on the Vot calculation spreadsheet that says "Show Codes for Ez". These can also be found in Table 6.2 of ASHRAE 62.1-2007 or the 62.1-2007 users manual. The most commonly used is CSCRH: Ceiling supply of warm air 15degF or more above space temperature and ceiling return. This gives an Ez value of 0.8.
Note that in the Directions tab of the USGBC 62MZ calculator, it states:
"LEED Documentation: If the value for Ez is different than 0.8, the narrative should describe the value used, and provide a brief justification for that value."

3. Yes, it generally works best to create a separate file for each ventilation system.

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Christina Reeves Principal Environmental Specialist Progressive Associates
Feb 10 2014
LEEDuser Member
111 Thumbs Up

Using the 62MZ calculator

Hello, I have two questions from our ME about using the spreadsheet calculator:
1. Neither of us can get the macros to work on the calculator - to add zones, etc. We both choose 'enable Macros' when opening the file but the buttons still don't work. He is on PC and I'm on a Mac, so platform isn't the issue. Does anyone have tips for this?

2. Is there any guidance out there for how to use the calculator with demand-controlled ventilation?

Thanks much!

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Ben Stanley Sustainability Manager, YRG sustainability Feb 10 2014 LEEDuser Expert 4551 Thumbs Up

Christina,

I've been able to use the macros on PC's but never on a Mac. I'm not sure what the issue might be in this case. What about using the form calculator instead?

For the demand control ventilation, I would still set up the calculations and testing to reflect the scenario where the potentially critical zones are fully occupied and the fans and outside air dampers are set to the lowest point (worst case condition typically in the heating season). Also, if the CO2Carbon dioxide sensors are located in the return duct, the review team will likely request justification for how those sensors are accurately accounting for the CO2 in the breathing space of the occupied spacesOccupied Spaces are defined as enclosed spaces that can accommodate human activities. Occupied spaces are further classified as regularly occupied or non-regularly occupied spaces based on the duration of the occupancy, individual or multi-occupant based on the quantity of occupants, and densely or non-densely occupied spaces based upon the concentration of occupants in the space..

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Julia Weatherby Senior Mechanical Engineer, Lindgren & Sharples, P.C. Feb 10 2014 LEEDuser Member 1571 Thumbs Up

Christina-

On a PC, sometimes if the security level for macros is set to high or very high then even enabling macros will not allow them all to run. I would think you would get a warning message about that though, so that might not be the problem. Your ME on the PC could try downloading a fresh copy (or a copy from a different source) of the spreadsheet and trying again, making sure the security setting under macros is set to medium. Also try the help troubleshooting menu for macros from within Excel.

As Ben wrote, demand control ventilation does not necessarily come into play for the ventilation rate spreadsheet. You can use the design ventilation values for the spreadsheet, ignoring the demand control ventilation. Then the demand control ventilation is added as part of the control system.

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Christina Reeves Principal Environmental Specialist, Progressive Associates Feb 10 2014 LEEDuser Member 111 Thumbs Up

Thanks, Ben and Julia. I'll pass your suggestions along to our ME and see if they help. Cheers!

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American University Sustainability American University
Jan 23 2014
LEEDuser Member
885 Thumbs Up

Subtracting built-in furniture/casework from square footage

We've had a designer tell us that built-in furniture and case work (like a fan-coil unit enclosure) can be deducted from the square footage of a room when calculating the window opening requirement. ASHRAE 62.1 says "Naturally ventilated spaces shall be permanently open to and within 8 m (25 ft) of operable wall or roof openings to the outdoors, the openable area of which is a minimum of 4% of the net occupiable floor area." Do others agree that the square footage of those items can be deducted? This is for a residence hall application. Thanks.

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Julia Weatherby Senior Mechanical Engineer, Lindgren & Sharples, P.C. Jan 23 2014 LEEDuser Member 1571 Thumbs Up

Yes I agree that built-in features which reduce the open floor area can be deducted from the room area when finding net area for natural ventilation calculations.
- Julia Weatherby PE, LEED AP BD+C

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Sandra E. Project Manager ECO
Nov 06 2013
Guest
79 Thumbs Up

Type and sub-type area matrix IEQ EBOM

I have a question if a have in an EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems. project and this project isn´t an industrial facilities area ,but I have much inactive storage, is the space not included in the IEQp1 credit requirements?

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Tristan Roberts LEED AP BD+C, Editorial Director – LEEDuser, BuildingGreen, Inc. Dec 20 2013 LEEDuser Moderator

Carola, unoccupied space types are not subject to the requirements.

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Alexis Thompson Project Coordinator Sellen Sustainability
Oct 29 2013
LEEDuser Member
188 Thumbs Up

Exhaust Fan Testing in a Laboratory

I am working on a laboratory project and we are gearing up to perform the exhaust fan testing internally. Our building has a LOT of laboratory exhaust fume hood fans that only serve the laboratory equipment/processes. Do we need to perform testing on each and every one of these exhaust systems as well? Or, can we simply do the base building bathroom, shower, kitchen and parking exhaust systems? If we should test the lab fume hoods too then is it possible to test a sample? Please advise. Thank you!

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David Hubka Director - Operations, Transwestern Sustainability Services Oct 30 2013 LEEDuser Expert 996 Thumbs Up

On a previous project I have received a review comment stating that we must test all exhaust fans, not just bathroom, shower, kitchen, and parking as specifically stated in the reference guide. Don't think they will allow sampling.

Also, the GBCI defines exhaust fan as any fan that moves air from the inside of the building to the outside of the building. On past projects I have been required to test relief fans as well.

Hope this helps!

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Nena Elise Jan 29 2014 LEEDuser Member 3506 Thumbs Up

What about circulating and supply fans? Do those need to be tested?

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David Hubka Director - Operations, Transwestern Sustainability Services Jan 29 2014 LEEDuser Expert 996 Thumbs Up

Circulating and supply fans do not require testing. Only fans that move inside air to the outside.

Maybe substitute the EQp1 from v4 into your project as recently allowed by USGBC: http://www.usgbc.org/articles/use-v4-credits-your-v2009-project

EQp1 in v4 does not require testing of exhaust fans, only that they have a PM plan and PM actions are logged. Nice time saving short cut for projects that have a significant amount of exhaust fans.

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Nena Elise Feb 03 2014 LEEDuser Member 3506 Thumbs Up

Excellent thank you David! However the LEED reviewers did ask us to upload the exhaust testing report in our initial review. This is definitely worth a try though!

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David Hubka Director - Operations, Transwestern Sustainability Services Feb 03 2014 LEEDuser Expert 996 Thumbs Up

they probably won't let you substitute a v4 prereq/credit after the preliminary submission, but I agree with you that it may worth a try.

good luck!

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Levi Jimenez Project Manager, BuildingWise Oct 17 2014 LEEDuser Member 5 Thumbs Up

Nena, I am very curious: Did the reviewer allow you to substitute the v4 prerequisite compliance option in lieu of an exhaust fan test report? I am in a similar, if not identical situation now. I look forward to your response.

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Alan Grant Terra Neutral LLC
Oct 22 2013
LEEDuser Member
54 Thumbs Up

Measuring for an Office Building with 92 Heat Pumps

My client has an office building with one outside air supply fan supplying ventilation air throughout the three story building via ductwork to 92 heat pumpA type of heating and/or cooling equipment that draws heat into a building from outside and, during the cooling season, ejects heat from the building to the outside. Heat pumps are vapor-compression refrigeration systems whose indoor/outdoor coils are used reversibly as condensers or evaporators, depending on the need for heating or cooling. In the 2003 CBECS, specific information was collected on whether the heat pump system was a packaged unit, residential-type split system, or individual room heat pump, and whether the heat pump was air source, ground source, or water source. units. Is outdoor air measurement required at the supply air fan or at all 92 heat pumps?

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David Hubka Director - Operations, Transwestern Sustainability Services Oct 24 2013 LEEDuser Expert 996 Thumbs Up

Projects that have a dedicated outside air system that supplies ventilation to distributed heat pumps and/or fan coil units it would be necessary to perform the calculations and measurements at each distributed system.

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Pete Dahl SEBESTA Oct 25 2013 Guest 259 Thumbs Up

I believe measurements at each heat pumpA type of heating and/or cooling equipment that draws heat into a building from outside and, during the cooling season, ejects heat from the building to the outside. Heat pumps are vapor-compression refrigeration systems whose indoor/outdoor coils are used reversibly as condensers or evaporators, depending on the need for heating or cooling. In the 2003 CBECS, specific information was collected on whether the heat pump system was a packaged unit, residential-type split system, or individual room heat pump, and whether the heat pump was air source, ground source, or water source. are outside the scope of the balloted rating system. The rating system states, "measurements taken at the system level...Each air-handler must be measured."
However, the calculations to find minimum OA flow would need to account for the critical zone, and associated occupant density and total airflow.

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David Hubka Director - Operations, Transwestern Sustainability Services Oct 25 2013 LEEDuser Expert 996 Thumbs Up

I asked this same question to the GBCI, there response was what I have posted previously. Perhaps submit with an OA measurement at the supply fan but understand they may require OA tests at all 92 heat pumps.

good luck!

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Ben Stanley Sustainability Manager, YRG sustainability Nov 05 2013 LEEDuser Expert 4551 Thumbs Up

I would agree that measuring the outside air at each heat pumpA type of heating and/or cooling equipment that draws heat into a building from outside and, during the cooling season, ejects heat from the building to the outside. Heat pumps are vapor-compression refrigeration systems whose indoor/outdoor coils are used reversibly as condensers or evaporators, depending on the need for heating or cooling. In the 2003 CBECS, specific information was collected on whether the heat pump system was a packaged unit, residential-type split system, or individual room heat pump, and whether the heat pump was air source, ground source, or water source. is not required and rather that the 'system level' in this case is the dedicated outside air unit. It would be different if the dedicated OA unit supplied OA to floor by floor AHUs. In that case, each AHU would need to be tested.

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David Eldridge Project Manager, Grumman/Butkus Associates Oct 20 2014 LEEDuser Member 474 Thumbs Up

Why wouldn't the heat pumps be considered as AHUs? In the Q&A above, the example is pretty clear that a DOAS providing ducted airflow to other fan systems (in this case the heat pumps) would be measured at each AHU.

If each heat pump wasn't measured, how would you know how much OA was coming to each heat pump? The system could be out of balance, but this wouldn't be detected by measuring the DOAS only.

I could see a more practical approach if the DOAS total airflow was much higher than the minimum and if the design airflows of the heat pumps corroborated an ample airflow, and a few were sampled and showed compliance.

Although personally I'd advocate for a more practical approach, and which might be approved by the reviewer on a case-by-case basis...the OA quantity might be cross-checked if the heat pumps have any digital temperature sensors for instance without airflow measurement, or CO2Carbon dioxide measurements could be taken as a reference...I think David Hubka is correct according to the stated requirements.

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Ilona Johnson, PE, CEM, LEED AP Associate, Lilker EMO Energy Solutions Oct 20 2014 Guest 290 Thumbs Up

I think LEED v 4 allows sampling. Maybe submitting this credit under LEED v4 is a good way to go?

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Nena Elise
Oct 17 2013
LEEDuser Member
3506 Thumbs Up

Performance Period Question

On this same note, what do you all think about this situation: we have all our OA measurement done for each AHU1.Air-handling units (AHUs) are mechanical indirect heating, ventilating, or air-conditioning systems in which the air is treated or handled by equipment located outside the rooms served, usually at a central location, and conveyed to and from the rooms by a fan and a system of distributing ducts. (NEEB, 1997 edition) 2.A type of heating and/or cooling distribution equipment that channels warm or cool air to different parts of a building. This process of channeling the conditioned air often involves drawing air over heating or cooling coils and forcing it from a central location through ducts or air-handling units. Air-handling units are hidden in the walls or ceilings, where they use steam or hot water to heat, or chilled water to cool the air inside the ductwork. and all are complying except 1 because the TAB contractor thought it was acceptable to have the OA be +/- 10% of the OA rates we gave him from our VRP calculations. So, he under ventilated one of the AHUs by about 20 cfms. We finally got the contractor to come back and adjust the AHU and increase the cfms to reach the minimum. He came back this month (October) and all our other PP ended on Aug 31st. Does this mean we now need to extend all our other PP to Sept. 31 so that they call end within 30 days of each other? Or do you think the reviewers will accept having the one AHU measured in October? It has been nearly impossible for us to collect data from the building tenants so going back and asking for Sept. data will be very difficult.

Thank so much for any thoughts on this :)

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Nena Elise Oct 21 2013 LEEDuser Member 3506 Thumbs Up

If anyone can provide some feedback on this, I'd greatly appreciate it!
Thanks :)

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Ben Stanley Sustainability Manager, YRG sustainability Oct 21 2013 LEEDuser Expert 4551 Thumbs Up

Hi Nena,

I think that there's a good chance that the review team will allow the testing for the one AHU1.Air-handling units (AHUs) are mechanical indirect heating, ventilating, or air-conditioning systems in which the air is treated or handled by equipment located outside the rooms served, usually at a central location, and conveyed to and from the rooms by a fan and a system of distributing ducts. (NEEB, 1997 edition) 2.A type of heating and/or cooling distribution equipment that channels warm or cool air to different parts of a building. This process of channeling the conditioned air often involves drawing air over heating or cooling coils and forcing it from a central location through ducts or air-handling units. Air-handling units are hidden in the walls or ceilings, where they use steam or hot water to heat, or chilled water to cool the air inside the ductwork. to have fallen out of the performance period window if you explain the situation. I've seen projects where the reviewers allowed the project team to make corrections to the AHUs after the preliminary review to bring them into compliance. Given that, I think your best bet is to hold off changing the performance period for all of the other credits until after the preliminary review and only if GBCI requires it.

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Tam Kin Hung
Oct 09 2013
LEEDuser Member
116 Thumbs Up

Total Peak occupancy filled in Plf 3 AND the one used in IEQ P1

I am working on a LEED EB project, the Total Peak occupancy filled in Plf 3 is clear, however, but just wonder how this number can also maintain reasonable in IEQ P1 in order to calculate the Population Diversity (D) ? Since the Total Peak Occupancy for IEQ P1 might has to include the seatcount in conference room.

Please advice, thanks

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Tristan Roberts LEED AP BD+C, Editorial Director – LEEDuser, BuildingGreen, Inc. Nov 04 2013 LEEDuser Moderator

I don't see figures like those you are referring to being requested on the IEQp1 forum Please correct me if I'm wrong, or missing something.

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Ben Stanley Sustainability Manager, YRG sustainability Nov 05 2013 LEEDuser Expert 4551 Thumbs Up

I would make sure that the aggregate system level occupancy, after accounting for diversity, is close to the Total Peak occupancy included on PIf3.

If you are using the 62MZ calculator that value can be adjusted manually after the potentially critical zones are input. One other thought is that seat count is not necessarily the appropriate value for occupancy to input for the potentially critical zones. Instead, the EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems. calculation requires us to input the number of occupants based on the max occupancy observed during normal operations for the space.

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cathy keagle
Oct 01 2013
Guest
182 Thumbs Up

Testing Exhaust Fans

Does anyone have advice for a building where we are unable to find the drawings which specify the Design CFM for some of the exhaust fans? We have exhausted the search and can not find the drawings.

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Oct 22 2014
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