Retail-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..

    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

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Feb 25 2017
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