[Bldg-sim] Appendix G. laboratory spaces with minimum 5000 cfm exhaust

[Paul Erickson]

Bill,

A few of us (AEI, ASHRAE, Labs21, and NREL)  began a dialogue about this in January hoping to get published clarity via the 90.1 Continuous Maintenance process.  The timing of our comments happened to coincide with committee voting already in progress and no clarification was made.  However, it was discussed that the intent is that the 5000 CFM minimum is in reference to System exhaust rates, not the exhaust rates of a single Space.

Hope that helps.

Paul

Paul Erickson  LEED(r) AP
SR. Sustainable Design COnsultant



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From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Bishop, Bill
Sent: Wednesday, August 18, 2010 1:42 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Appendix G. laboratory spaces with minimum 5000 cfm exhaust

For baseline HVAC system type, ASHRAE 90.1-2007 has the following exception (G3.1.1 d.):
"For laboratory spaces with a minimum of 5000 cfm of exhaust, use system type 5 or 7 that reduce the exhaust or makeup air volume to 50% of design values during unoccupied periods."
Similarly, "systems serving laboratories with exhaust rates of 5000 cfm or greater" are excepted from the baseline energy recovery requirement (G3.1.2.10 h.).

When applying this exception, is it 5000 cfm per space? Per floor? Per building? Per system?

Thanks,
Bill

William Bishop, PE, BEMP, LEED(r) AP | Pathfinder Engineers & Architects LLP
Mechanical Engineer

134 South Fitzhugh Street
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