EBOM-v4 EQc3: Thermal comfort

  • Typically pursued by Gold or Platinum projects

    If you’re pursuing higher levels of certification and 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. in place already, consider this credit. To earn it you’ll need to implement two forms of thermal comfort monitoring, including continuous monitoring of air temperature and humidity, and periodic measurements of air speed and radiant temperature. 

    Once you’ve confirmed that you have or can implement the required monitoring, the credit requires that you also determine acceptable boundaries for thermal comfort in the building based off of ASHRAE 55-2010 or one of two alternative international standards. That means that pursuing the credit requires some engineering expertise in order to set the appropriate boundaries and put a system in place to track and verify performance.

    One bright note is that under LEED v4, humidity monitoring can now be at the system (air handler unit—AHU) level, rather than in all occupiable spaces as was required in LEED 2009. This should make the credit somewhat more feasible from a cost perspective.

    What’s New in LEED v4

    • The referenced standard has been updated to ASHRAE 55–2010. For an explanation of changes from the 2004 version of the standard, refer to ASHRAE Journal (June 2011).
    • The credit now includes international standards to provide more relevant compliance options for non-U.S. projects.
    • The credit now requires humidity monitoring at the humidity zone level (e.g., for each air-handling system) instead of in each occupied space.
    • USGBC has established new compliance paths for data centers, which must satisfy only the credit requirements in regularly occupied spacesEnclosed space intended for human activities, excluding those spaces that are intended primarily for other purposes, such as storage rooms and equipment rooms, and that are only occupied occasionally and for short periods of time. Occupied spaces are further classified as regularly occupied or nonregularly occupied spaces based on the duration of the occupancy, individual or multioccupant based on the quantity of occupants, and densely or nondensely occupied spaces based on the concentration of occupants in the space..

    Readiness Review Questions

    • Are you performing continuous monitoring for air temperature, radiant temperature, humidity, and air speed? If not, can appropriate sensors be added to cover an adequate portion of occupied spaces? 

    • Do you have a system in place to respond to thermal comfort system alarms or occupant complaints with appropriate corrective actions in a timely manner? 

    • Are building engineers or third party technicians available and capable
 of performing periodic testing of air speed and radiant temperature?

    FAQs

    What’s up with the ISO and CEN standards? Is the credit implementation easier using one of these standards?

    The ISO and CEN standards are simply alternatives for determining acceptable ranges for thermal comfort in the building. So, applying one of these standards instead of ASHRAE 55-2010 won’t change the monitoring strategy that you need to have in place. However, the alternative standards may be more familiar to international teams and therefore could make the implementation process go more smoothly.

     

  • EQ Credit 3: Thermal comfort

    Intent

    To promote occupants’ productivity, comfort, and well-being by providing quality thermal comfort.

    Requirements

    Establishment

    Option 1. ASHRAE 55–2010 [India ACP: Thermal Comfort NBC]

    Have a permanent monitoring system to ensure ongoing building performance to the desired comfort criteriaComfort criteria are specific design conditions that take into account temperature, humidity, air speed, outdoor temperature, outdoor humidity, seasonal clothing, and expected activity. (ASHRAE 55–2004), as specified by ASHRAE Standard 55–2010, Thermal Comfort Conditions for Human Occupancy, Section 5.2 or 5.3, with errata, or a local equivalent.

    [India ACP: Thermal Comfort NBC]

    OR

    Option 2. ISO and CEN Standards

    Have a permanent monitoring system to ensure ongoing building performance of the desired comfort criteria, as specified by the applicable standard:

    • ISO 7730:2005 Ergonomics of the Thermal Environment, analytical determination and interpretation of thermal comfort using calculation of the PMV and PPD indices and local thermal comfort criteria; and
    • 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, Section A2.

    Performance

    The monitoring system must meet the following requirements.

    • Continuous monitoring. Monitor at least air temperature and humidity in occupied spacesEnclosed space intended for human activities, excluding those spaces that are intended primarily for other purposes, such as storage rooms and equipment rooms, and that are only occupied occasionally and for short periods of time. Occupied spaces are further classified as regularly occupied or nonregularly occupied spaces based on the duration of the occupancy, individual or multioccupant based on the quantity of occupants, and densely or nondensely occupied spaces based on the concentration of occupants in the space., at sampling intervals of 15 minutes or less.
    • Periodic testing. Monitor air speed and radiant temperature in occupied spaces. Using handheld meters is permitted.
    • Alarms. An alarm must indicate conditions that require system adjustment or repair.
    • Prompt repair. Specify procedures for adjustments or repairs to be made in response to problems identified.
    • Calibration. All monitoring devices must be calibrated within the manufacturer’s recommended interval.

    Alternative Compliance Paths (ACPs)

    India ACP: Thermal Comfort NBC

    OPTION 1. ASHRAE 55–2010 OR THE NATIONAL BUILDING CODE OF INDIA 2005 (NBC 2005)

    Projects in India may meet the desired comfort criteria specified in the following as a local equivalent to ASHRAE 55-2010:

    • For mechanically conditioned buildings, NBC 2005 Part 8, Section 3 - Table 2
    • For naturally conditioned buildings, NBC 2005 Part 8, Section 1 - Table 9

6 Comments

0
0
Laura Danzig Cushman & Wakefield
Jan 13 2017
LEEDuser Member

Continuous Monitoring Sensors

Project Location: Spain

Hi there,

a quick question regarding the locations of the sensors/measurements required for this credit.

As stated by Ashrae 55-2010, Air temperature
and air speed shall be measured at the 0.1, 0.6, and
1.1 m (4, 24, and 43 in.) and radiant asymmetry at 0.6 m (24 in.). I was wondering if these measurements are required for the permanent and continuous sensor system or just the periodic measurements for this credit? Otherwise, is it OK to have one sensor per each thermal zone installed at any height for at least the continuous monitoring system?

Thank you in advance!

Laura

1
1
0
Ben Stanley Sustainability Manager, YRG sustainability Mar 08 2017 LEEDuser Expert 6452 Thumbs Up

Hi Laura,

In my experience, the measurement locations you cite from ASHRAE 55-2010 apply to the periodic measurements of air speed and radiant temperature but not to the permanent air temperature sensors. I think this is supported by the LEED reference guide language that states "at least one air temperature sensor must be installed for each thermal zone with occupied spacesEnclosed space intended for human activities, excluding those spaces that are intended primarily for other purposes, such as storage rooms and equipment rooms, and that are only occupied occasionally and for short periods of time. Occupied spaces are further classified as regularly occupied or nonregularly occupied spaces based on the duration of the occupancy, individual or multioccupant based on the quantity of occupants, and densely or nondensely occupied spaces based on the concentration of occupants in the space.. The sensors may be placed close to where the occupants are known to spend time. Sensors in the return air duct to the air-handling unit are not acceptable. Additional sensors are required if a single measurement point is not representative of the entire thermal zone because of its use or configuration, if a space includes both perimeter and core area, if a space can be subdivided (e.g., with a movable wall), or if other drivers of large air temperature variance are present."

Post a Reply
0
0
Patricia Andrasik Assistant Professor / Head of Sustainability Outreach The Catholic Universtiy of America
Mar 20 2014
LEEDuser Member
82 Thumbs Up

Data loggers

How would one install data loggers to track thermal comfort in a dormitory?

1
3
0
Tristan Roberts LEED AP BD+C, Executive Editor – LEEDuser, BuildingGreen, Inc. Mar 21 2014 LEEDuser Moderator

Patricia, can you be more specific in your question?

2
3
0
Patricia Andrasik Assistant Professor / Head of Sustainability Outreach, The Catholic Universtiy of America Aug 03 2016 LEEDuser Member 82 Thumbs Up

We have installed the data loggers, but they are stand alone and are not connected to an alarm system. Could it be possible to achieve the credit by implementing a protocol that requires a constant review of the data which is then submitted to facilities to address any possible issue?

3
3
0
Ben Stanley Sustainability Manager, YRG sustainability Aug 19 2016 LEEDuser Expert 6452 Thumbs Up

Hi Patricia,

The rating system and reference guide language related to the alarm makes it seem to me that the intent is for the alarm to be automatic, rather than based on manual review of the data. Could the data loggers that you have indicate some sort of alarm, like a flashing light, if the conditions get outside of the acceptable range?

Post a Reply

Start a new comment thread

Jul 24 2017
Type the characters you see in this picture. (verify using audio)
Type the characters you see in the picture above; if you can't read them, submit the form and a new image will be generated. Not case sensitive.

Copyright 2017 – BuildingGreen, Inc.