ID#1470 made on
EQc6.2 - Controllability of systems - non-perimeter spaces
LEED BD+C: New Construction, LEED O+M: Existing Buildings
LEED IEQ 6 requires the initial determination of room occupancy using ASHRAE 62-2201, Table 2. We have been attempting to pursue this credit point for a hospital renovation/addition consisting of appr...
LEED IEQ 6 requires the initial determination of room occupancy using ASHRAE 62-2201, Table 2. We have been attempting to pursue this credit point for a hospital renovation/addition consisting of approximately 100,000 gsf of Intensive Care, Critical Care, Emergency Department and Outpatient procedure spaces. But we have been finding that the ASHRAE table is so limiting in it's brief list of room types that we are expecting to have to submit to the USGBC the 'narrative justifying exceptions' that is mentioned in the Reference Manual, pg 288, for a majority of the roughly 400 spaces: For example, a straight-forward application of the reference standard results in the following 'regular occupancies'; A 459 sf CAT scan room, using the ASHRAE occupancy of 20/1,000 sf for Medical Procedures, has an occupant load of (9) people. Similarly, a 257 sf critical care room, using the 10/1,000 for Patient Rooms, has an occupant load of (3), requiring (3) lighting, (3) airflow & (3)temperature controls. The more we consider how to apply the ASHRAE table in determining the number of controls, the more we wonder if (a) we are failing to understand some important nuance of the instructions; OR (b) how most any project team could pursue this point without having to submit an enormous number of the written justifications; OR (c) if this is a point that is suitable only for a remarkably small number of projects (and project types) to pursue. Would the USGCB accept a submission that includes many dozens of 'exceptions' arguing, for example, that a 324 square foot x-ray room has one (non-regular occupant) patient and only one (regular occupant) technician? Isn't there somewhere a better standard for use in determining occupancy? Thank you, Andrew M. GIl, AIA LEED AP HOLT Architects, P.C. Ithaca, NY 14850 amg@HOLT.com
The intent of the credit is to provide a high level of thermal, ventilation and lighting system control in order to promote the productivity, comfort and well-being of building occupants. The USGBC recognizes the unique purpose and functions that take place in healthcare-related facilities. Instead of providing justifications for each individual room/space, the proposed approach of consolidating the exceptions based upon functional type seems reasonable. For these exceptions, explain how the local environment is controlled or adjusted by the regular occupants. At this time, the credit suggests referencing ASHRAE 62-2001 for determining occupancy densities, but it is not required for credit compliance. If another method or reference is used, then the reasoning would need to be documented and justified.
Related Addenda (Corrections & Interpretations)