[Equest-users] Supply Air Temp Reset Interpretation Please...?

Jones, Christopher via Equest-users equest-users at lists.onebuilding.org
Thu Apr 20 05:48:54 PDT 2017

I had always assumed temperature first but reading the PNNL 90.1-2010 Performance Rating Method Reference Manual, 3.121 (pdf page 151), it states “For systems 5 through 8, the air temperature for cooling shall be reset higher by 5°F under the minimum cooling load conditions using a reset by warmest zone, airflow first strategy.”

The manual states that the airflow first strategy minimizes zone reheat coil energy ( or overcooling) and central chiller energy consumption at the cost of possible increased fan energy.

Unfortunately, the reviewer may have a case.

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Christopher R. Jones, P.Eng.
Technical Specialist

WSP Canada Inc.
2300 Yonge Street, Suite 2300
Toronto, ON M4P 1E4 Canada
T +1 416-644-0252


Please consider the environment before printing...

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Pasha Korber-Gonzalez via Equest-users
Sent: Thursday, April 20, 2017 3:59 AM
To: eQUEST Users List <equest-users at lists.onebuilding.org>
Subject: [Equest-users] Supply Air Temp Reset Interpretation Please...?

Hello--- I received this note from a fellow energy model reviewer (non-LEED review comment) regarding my Baseline energy model that is supposed to be compliant with Appendix G.  I disagree with what they are saying.  I appreciate your feedback please and verification if in fact I am wrong in how I am interpreting Section G3.1.3.12.

"We believe TEMP-FIRST supply air reset control strategy is not the correct interpretation of G3.1.3.12 – rather, AIRFLOW-FIRST should be used."


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