[Equest-users] Medical building design flowrates - ASHRAE 170

[Fred Betz]

Steve,

Yes, you can use ASHRAE 170 in the baseline if that's what's mandated by code. About 30 states use one edition or another of Standard 170.

For spaces not covered by ASHRAE 170, use ASHRAE 62.1 unless otherwise directed by local code.

LEED 2009 for Healthcare requires following ASHRAE 170-2008.

I've had 3 projects successfully reviewed by GBCI for LEED certification using this approach.

Fred


Fred Betz  PhD., LEED AP (r)BD+C
Senior Sustainable
Design Consultant



AEI | AFFILIATED ENGINEERS, INC.
5802 Research Park Blvd. | Madison, WI  53719

P: 608.236.1175 | F: 608.238.2614
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From: Steve Jacobs [mailto:sjacobseng at gmail.com]
Sent: Thursday, July 16, 2015 11:38 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Medical building design flowrates - ASHRAE 170

For medical buildings that are governed by ASHRAE 170 the airflow requirements are a bit different. The standard not only mandates minimum OA flowrates but also general airflow rates (often times 6 ACH or higher). This airflow rate is typically higher than the autosized rates based on a 20F differential. It seems like the baseline should use the required flowrates like the proposed, but has anyone gone through this with a LEED reviewer. Basically it would mean that the minimum flowrate in the VAV spaces would be 100% resulting in a lot of reheat energy.

Thanks,
Steve
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