Mid-Rise-v4 EAp1: Minimum energy performance

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  • EA Prerequisite 1: Minimum energy performance

    Intent

    To improve the building’s overall energy performance and reduce its greenhouse gas emissions.

    Requirements

    Meet both the whole-building energy simulation and commissioningThe process of verifying and documenting that a building and all of its systems and assemblies are planned, designed, installed, tested, operated, and maintained to meet the owner's project requirements. requirements:

    Whole-Building Energy Simulation

    Demonstrate a 5% improvement over the baseline building performanceThe annual energy cost for a building design, used as a baseline for comparison with above-standard design. rating. Calculate the baseline according to the building performance rating method of USGBC’s residential midrise simulation guidelines, which is based on ANSI/ASHRAE/IESNA Standard 90.1–2010, Appendix G (with errata), or USGBC-approved equivalent standard for projects outside the United States, using a computer simulation model for the whole-building project.

    Comply with the mandatory provisions of ANSI/ASHRAE/IESNA Standard 90.1–2010 (with errata).

    Comply with USGBC’s residential midrise simulation guidelines.

    Include all energy consumption and energy costs associated with the building project.

    Compare the design case with a baseline building that complies with Standard 90.1–2010, Appendix G (with errata but without addenda).

    AND

    Commissioning

    Option 1. Commissioning using ENERGY STAR protocols. Meet the ENERGY STAR Qualified Multifamily High Rise Buildings Testing and Verification (T&V) Protocols.

    OR

    Option 2. Commissioning using Prescriptive Path.

    Meet all of the following:

    1. Reduced Heating and Cooling Distribution System Losses for In-unit HVAC

      Limit the duct air leakage rateThe speed at which an appliance loses refrigerant, measured between refrigerant charges or over 12 months, whichever is shorter. The leakage rate is expressed in terms of the percentage of the appliance's full charge that would be lost over a 12-month period if the rate stabilized. (EPA Clean Air Act, Title VI, Rule 608)., testing for leakage to outside the unit or conducting a total duct leakage test. The tested leakage-to-outside rate must be less than 4.0 cfm25 per 100 square feet (1.2 cmm at 25 Pascals per 100 square meters) of conditioned floor area for each installed system, verified by a qualified energy rater. For units smaller than 1,200 square feet (110 square meters) tested leakage must be less than 6.0 cfm25 per 100 square feet (1.7 cmm at 25 Pascals per 100 square meters). Total duct leakage for in-unit systems must not exceed 8 cfm25 per 100 square feet (2.4 cmm at 25 Pascals per 100 square meters) of conditioned floor area. Testing is waived if the air-handler unit and all ductwork are visibly within the unit’s envelope (i.e., no ducts are hidden in walls, chases, floors, or ceilings).
    2. Fundamental Commissioning of Central HVAC Systems

      Meet the performance testing and ongoing maintenance requirements of EA Prerequisite Fundamental Commissioning and Verification of LEED v4 for New Construction for central commercial heating, cooling, water heating and ventilation systems. The requirements include the following:

      • Develop a system test procedure.
      • Verify system test execution.
      • Maintain an issues and benefits log throughout the commissioning process.
      • Document all findings and recommendations and report directly to the owner throughout the process.
      • Prepare and maintain a current facilities requirementsThe implementation of the owner's project requirements, developed to confirm the owner's current operational needs and requirements. and operations and maintenance plan documenting information necessary for efficient building operations.


    3. Construction Document Specifications

      Include the following details in construction and bid documents:

      • Elements to be sealed (construction and bid documents). List all elements identified in ASHRAE 90.1–2010, Section 5.4.3.1, or applicable state or local codes, in addition to any site-specific elements identified during plan review, and include the items in the LEED for Homes multifamily midrise thermal enclosure inspection checklist (see below). Show locations to be sealed as well as acceptable methods and materials.
      • Air barrier sheet (bid documents). Show the air barrier continuity through the various conditions of the exterior enclosure; this information can serve as an index to details.
      • Compartmentalization sheet (bid documents). Show the continuity of fire and smoke barriers around each apartment and between corridors, stairs, and common areas; this information can serve as an index to details.


    4. LEED for Homes Multifamily Midrise Thermal Enclosure Inspection Checklist

      Have a third party–qualified energy rater verify each item on the checklist. The LEED checklist is based on the ENERGY STAR for Homes, version 3 (Rev. 02) thermal enclosure rater checklist, Sections 2, 3, and 5.

    Certified Passive House projects automatically meet the thermal enclosure inspection checklist requirement.  

    Canada ACP - NECB

    Projects in Canada may instead demonstrate a percentage improvement in the proposed building performance rating compared with the baseline according to the National Energy Code for Buildings (NECB) 2011. The same percentage cost improvement in energy performance is required to meet the Prerequisite, and the same points for cost percentage improvement in energy performance are applicable for the Credit.

    The following conditions (where applicable) must be met. Note that unless otherwise noted, CanQUEST (the Canadian energy modelling software based on eQUEST that performs NECB 2011 compliance runs) does not implement many of these conditions correctly and would require corresponding modifications to the Reference case.

    1. Comply with mandatory requirements of ASHRAE 90.1-2010
    2. ASHRAE 90.1-2010 mandatory requirements must be met, in addition to the performance path limitations referenced in the NECB 2011 Sections 3.4.1.2, 5.4.1.2 and 6.4.1.2. In cases where ASHRAE and the NECBC reference requirements concerning the same item, the more stringent requirement shall be adhered to.

      The following exceptions apply:

    • ASHRAE 90.1-2010 mandatory items 6.4.3.9, 9.4.1.2b, 9.4.1.4, 9.4.1.5, 9.4.3

  • Apply fenestration area convention similar to ASHRAE 90.1-2010
  • Maintain the same FWR (as defined by NECB, including doors) for the Reference as exists in the Proposed Design, up to the prescribed maximum. If the Proposed Design’s FWR exceeds the prescribed FWR, scale down the fenestrations in the Reference case accordingly.

  • Apply skylight area convention similar to ASHRAE 90.1-2010
  • Maintain the same SRR for the Reference as exists in the Proposed Design, up to the prescribed 5% maximum. If the Proposed Design’s SRR exceeds 5%, scale down the skylights in the Reference case accordingly.

  • Model proposed and reference outside air similar to ASHRAE 90.1-2010
  • Proposed and reference (baseline) outside air rates shall be modeled as per ASHRAE 90.1 – 2010 (G3.1.2.6).

  • Apply ASHRAE kitchen exhaust demand ventilation requirements
  • Provide for the same demand ventilation requirements as described in ASHRAE Appendix G3.1.1.d.

  • Apply ASHRAE’s chiller heat recovery requirements
  • Provide for the same chiller heat recovery requirements as applies to ASHRAE.

  • Apply supply air temperature reset controlled based on warmest zone
  • Reset the minimum supply air temperature to satisfy the cooling requirements of the warmest zone, as stipulated in NECB Section 5.2.8.8. Note that this control setting is already corrected in CanQUEST for the Reference case.

  • Account for uninsulated structural penetrations if they exceed 2% of net wall area
  • The 2% allowance may be applied, but based on the net opaque wall area, not the entire building envelope area.

  • Follow ASHRAE/LEED rules for renovations to existing buildings
  • Model existing components consistent with ASHRAE and LEED provisions.

  • Account for all anticipated energy use in building
  • Fully account for all energy end-uses in the energy performance modelling.

  • DES Systems are to be modeled according to Option 1, Path 1 or Option 1, Path 2 as indicated in the LEED v4 Reference Guide
  • The following exceptions apply:

    • Option 1, Path 1 - Do not apply ASHRAE 90.1-2010 requirements for purchased heating and cooling. Under this ACP, purchased heating and cooling (as applicable) are modeled as cost-neutral in the baseline and proposed case. Local rates for purchased heating (fossil fuel based) and cooling are used to establish the purchased heating and cooling costs. The energy model's scope accounts for only downstream equipmentThe heating and cooling systems, equipment, and controls located in the project building or on the project site and associated with transporting the thermal energy of the district energy system (DES) into heated and cooled spaces. Downstream equipment includes the thermal connection or interface with the DES, secondary distribution systems in the building, and terminal units. Drift water droplets carried from a cooling tower or evaporative condenser by a stream of air passing through the system. Drift eliminators capture these droplets and return them to the reservoir at the bottom of the cooling tower or evaporative condenser for recirculation., plus purchased heating and cooling. NECB clause 8.4.3.6 does not apply for LEED projects.
    • Model baseline systems in accordance with NECB requirements, with DX coils replaced with chilled water coils if purchased cooling is present and fossil-fired furnaces replaced with hot water coils if purchased heating is present.
    • Option 1, Path 2: Do not apply ASHRAE 90.1-2010 requirements for baseline systems. Model baseline systems in accordance with NECB requirements for onsite generated equipment (i.e. assume building is not connected to a DES and the proposed building is modeled with a virtual plant according to LEED v4 Reference Guide requirements).

14 Comments

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Smita Thomas Energy Shrink, LLC
May 01 2017
Guest
3 Thumbs Up

Reciprocity b/w ESv3 and LEED MF midrise

Project Location: United States

A client needs an energy model for a multifamily midrise that is applying for LEED v4 and also applying for Energy Star. As per the client, an energy model built to ESv3 specs (90.1-2010 baseline) is acceptable for LEED MF midrise v4. Because the exceptions/special requirements in each are slightly different, I'd like to confirm that LEED v4 accepts the ESv3 model. Thanks in advance.

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Tristan Roberts LEED AP BD+C, Executive Editor – LEEDuser, BuildingGreen, Inc. May 05 2017 LEEDuser Moderator

Smita, we're looking into this. USGBC has to check with EPA.

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Smita Thomas Energy Shrink, LLC May 06 2017 Guest 3 Thumbs Up

Thanks. Appreciate it.

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Smita Thomas Energy Shrink, LLC Jul 21 2017 Guest 3 Thumbs Up

In case it helps others, GBCIThe Green Building Certification Institute (GBCI) manages Leadership in Energy and Environmental Design (LEED) building certification and professional accreditation processes. It was established in 2008 with support from the U.S. Green Building Council (USGBC). staff have confirmed that LEED models and ES MFHR models cannot be used interchangeably. This may change in the future if a comparative study is conducted at some point, but for now two separate models have to be created for the two programs. HTH.

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Sue Bryant engineer Noresco
Apr 20 2017
LEEDuser Member
4 Thumbs Up

ESv3 checklists

Project Location: United States

The EAp1 v4 requirement is to meet ESv3 by completing the thermal enclosure system rater checklist, the HVAC system quality install rater and contractor checklist and the water management system builder checklist. Current ESv3 versions are titled Rater Design Review Checklist, HVAC design report, HVAC Cx1. Commissioning (Cx) is the process of verifying and documenting that a building and all of its systems and assemblies are planned, designed, installed, tested, operated, and maintained to meet the owner's project requirements. 2. The process of checking the performance of a building against the owner's goals during design, construction, and occupancy. At a minimum, mechanical and electrical equipment are tested, although much more extensive testing may also be included. Checklist, and Water Management builder requirements. Should the current v3 checklists be used?

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Ann Edminster founder/principal, Design AVEnues LLC Apr 21 2017 LEEDuser Expert 867 Thumbs Up

Per USGBC staff, yes, use the ESv3 checklists. (They are working with EPA to better coordinate on naming issues in the future.)

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Amber Wood Sr. Manager NORESCO
Aug 24 2016
LEEDuser Member
3 Thumbs Up

USGBC’s residential midrise simulation guidelines

Where is the guideline document downloadable and does it include appendix B?
I've found the residential midrise simulation guidelines in a table here http://www.usgbc.org/node/9462224?view=resources&return=
yet not a document to download, and the table states "Hot water consumption associated with dwelling units shall be determined according to the exceptional calculation methodology detailed in Appendix B, Section B.1 of this manual."

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Asa Foss LEED for Homes Techincal Development, US Green Building Council Aug 24 2016 LEEDuser Expert 964 Thumbs Up

Hi Amber,

The reference to Appendix B is a hold over from a previous format of the residential simulation guidelines, which is the online tool you linked to. Any reference to Appendix B should be ignored. Instead, for example, the hot water information it is referring to is in the table under the 'Residential Simulation Guidelines' left nav in the online resource.

This error was recently flagged, and will be corrected in the October 1, 2016 update.

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sue bryant Architectural Energy Corporation
Jul 18 2016
LEEDuser Member
61 Thumbs Up

PV - how is it accounted for?

Project Location: United States

I would like to confirm that PV is accounted for solely in the energy model for V4 Midrise projects. Unlike Homes, there are no credits targeting PV. Also, I see no Innovation credits. Thank you

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Tristan Roberts LEED AP BD+C, Executive Editor – LEEDuser, BuildingGreen, Inc. Jan 17 2017 LEEDuser Moderator

Agreed on the first point, but there are Innovation credits.

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Joel Cesare Sustainable Building Advisor City of Santa Monica
Mar 30 2015
LEEDuser Member
94 Thumbs Up

Is LEED for Homes v4 Available?

Project Location: United States

A consultant informed us last week that you currently cannot use LEED for Homes v4. Is this true?

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Tristan Roberts LEED AP BD+C, Executive Editor – LEEDuser, BuildingGreen, Inc. Mar 30 2015 LEEDuser Moderator

Joel, LEED v4 for Homes is available, yes (and you'll find all the credits here onLEEDuser). Perhaps the consultant was confused by the fact that the previous version of LEED for Homes is also still on the market.

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Joel Cesare Sustainable Building Advisor, City of Santa Monica Mar 31 2015 LEEDuser Member 94 Thumbs Up

Thanks, Tristan. They are claiming California has historically had its own version of LEED for Homes and that is what is currently not available in v4. Can you confirm?

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Asa Foss LEED for Homes Techincal Development, US Green Building Council Jun 16 2015 LEEDuser Expert 964 Thumbs Up

Hi Joel,

Yes, California has historically had it's own version of LEED for Homes. The only difference has been the energy section, because T-24 addresses energy in a unique way (compared to the rest of the country/world), and USGBC aligned the energy section with T-24.

We are planning on doing an equivalency in the energy section to T-24 for LEED Homes v4 as well. However, we've heard that there will soon be a new approach to demonstrating energy savings in California (California HERS), so we are waiting for that program to launch before we issue a formal equivalency.

In the meantime, projects in California may use LEED v4, and just utilize the energy section from Homes v2008, which already requires that projects exceed T-24 2013 by 10%.

See Interpretation 10396 for Homes scoring: http://www.usgbc.org/leed-interpretations?keys=10396

See Interpreation 10395 for Midrise scoring: http://www.usgbc.org/leed-interpretations?keys=10395

If you (or anyone) has any additional questions, don't hesitate to contact me.

-Asa

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Jul 24 2017
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