[Bldg-sim] Mandatory Automatic Receptacle Controls for LEED (ASHRAE 90.1-2010)

[Gail Hampsmire]

USGBC has approved an exception to the mandatory automatic receptacle controls for LEED projects using ASHRAE 90.1-2010. This exception may be applied for LEED v4 BD&C/ID&C projects, and for any LEED 2009 BD&C/ID&C projects that are applying LEED Interpretation 10421.


Created on July 8, 2017
LEED Interpretation
ID# 10462
*         Share Email<https://www.usgbc.org/leedaddenda/10462>
*         Back<https://www.usgbc.org/leed-interpretations>
Rating System
LEED BD+C: New Construction, LEED BD+C: Core and Shell, LEED BD+C: Schools, LEED BD+C: Retail, LEED BD+C: Healthcare, LEED BD+C: Data Centers, LEED BD+C: Hospitality, LEED BD+C: Warehouses and Distribution Centers, LEED ID+C: Commercial Interiors, LEED ID+C: Retail, LEED ID+C: Hospitality
Rating System Version
v4 - LEED v4
Inquiry
ASHRAE 90.1-2010 mandatory requirement 8.4.2 Automatic Receptacle Control applies to 125 Volt receptacles in private offices, open offices, and computer classrooms. Are there any cases where exceptions to these mandatory requirements will be allowed?
Ruling
The project team is requesting clarification regarding how to model spaces where mandatory ASHRAE 90.1 receptacle controls are not implemented. Projects using one of the following two compliance paths are exempt from the receptacle control requirements:

1. Path 1: Projects Using Option 1. Whole Building Energy Simulation may model a penalty in the Proposed model for the spaces where mandatory ASHRAE 90.1 receptacle controls are not implemented. The following modeling requirements apply:

*         The receptacle power density modeled for these spaces shall be the greater of 0.75 Watts per square foot (8.1 Watts per square meter) or the design coincident peak receptacle power density (if known).

*         The receptacle schedule modeled in the Baseline for these spaces shall have a minimum Equivalent Full Load Hours of operation no less than:

o   The ASHRAE 90.1-2010 User's Manual default schedule for office occupancy (2,920 Equivalent Full Load Hours per year)
OR

o   120% of the occupied hours of operation for the facility

OR

o   Detailed justification shall be provided supporting an alternate schedule.

*         The Proposed model shall include either a 20% increase in the receptacle power density for these spaces OR a 20% increase in the scheduled receptacle Equivalent Full Load Hours of Operation versus the Baseline model.



2. Path 2: Projects must demonstrate that the project has implemented efficiency measures that will achieve an equal or greater reduction in receptacle energy consumption, and will persist for a similar timeframe to those achieved by ASHRAE 90.1-2010 Section 8.4.2. It is recommended that a Credit Interpretation Request be submitted when pursuing this approach. The project must provide documentation regarding the receptacle equipment controls that will be implemented for the project; and must provide justification supporting the claim that the savings over the life of the efficiency measure will be similar to those anticipated for a project compliant with Section 90.1-2010 Section 8.4.2. Note: The baseline and proposed receptacle energy consumption for these spaces must be modeled identically if using this approach; the project is not eligible for any further receptacle savings in these spaces using the Exceptional Calculation Method.


Applicable Credits
Name : Minimum energy performance
Rating system : New Construction,Core and Shell,Schools - New Construction,Healthcare,Hospitality - New Construction,Warehouse and distribution centers - New Construction,
Rating system version : v4
Name : Minimum energy performance
Rating system : Retail - Commercial Interiors,
Rating system version : v4
Name : Minimum energy performance
Rating system : Retail - New Construction,
Rating system version : v4
Name : Minimum energy performance
Rating system : Retail - Commercial Interiors,
Rating system version : v4



Best Regards,
Gail Hampsmire, P.E., LEED Fellow
Technical Director, HVAC/Energy Team

Green Business Certification Inc.
2101 L Street NW I Suite 500 I Washington DC 20037

Main: 1.202.742.3232 I fax: 202.828.5110 I email: ghampsmire at gbci.org<https://webmail.usgbc.org/owa/redir.aspx?C=GZ2NV9n-Tka0xcihwNMka3tPNQQR4NAIjnxy2TUGXqSkgYbQpUIWRhUKdDdD2AIzspYHZz0nHxM.&URL=mailto%3aghampsmire%40gbci.org>

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