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

[David Eldridge]

ASHRAE 170 or other AHJ often establish minimum airflow requirements that could be higher than the auto-sized airflow based on thermal loads for some spaces. The baseline will be subject to those requirements as well.

LEED reviewers should be familiar, just be sure to document your sources.

David




David S. Eldridge, Jr., P.E., LEED AP BD+C, BEMP, BEAP, HBDP
Grumman/Butkus Associates



From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Steve Jacobs
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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