[Equest-users] Compressor usage with economizer

Sami, Vikram Vikram.Sami at perkinswill.com
Wed Dec 21 11:52:57 PST 2011

Not sure if this is the reason, but the three units you mentioned all have "no" as the value for lockout compressor in the economizer tab. Try turning these to yes and see if it solves the problem.

Vikram Sami, LEED AP BD+C
Sustainable Design Analyst
1315 Peachtree St. NE, Atlanta, GA 30309
t: 404-443-7462    f: 404.892.5823       e: vikram.sami at perkinswill.com   www.perkinswill.com<http://www.perkinswill.com/>
Perkins+Will.  Ideas + buildings that honor the broader goals of society

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Jeremy N. Rapoza
Sent: Wednesday, December 21, 2011 1:54 PM
To: 'equest-users at lists.onebuilding.org'
Subject: [Equest-users] Compressor usage with economizer


I am currently having a problem where the compressors on my DX units are still kicking on during the Winter months even though I have an OA economizer.  This change in results happened after I added Demand Control Ventilation as a parametric run.  The overall savings were greater, but I was surprised how much cooling increased in the winter.  My design is using Bridgeport, CT weather.

I have attached the .pd2, .inp, and .prd files.  My concern is only for units labled RTU-1, AHU-2, and AHU-3.  Please ignore all the little PSZ's.

I have done a thorough search through the archives and have found this link<http://lists.onebuilding.org/htdig.cgi/equest-users-onebuilding.org/2008-November/000614.html> to be the most similar to my problem, but I don't see any resolutions that fully fixed my problem.

Here are two of the screen shots of how I set up RTU-1, which is essentially the same as the 2 other units:
[cid:image001.jpg at 01CCBFF0.3A4EA2B0]

[cid:image002.jpg at 01CCBFF0.3A4EA2B0]

Other notes:  I only have a few unmet hours.  SS-A report will show that winter cooling is more of a problem with RTU-1 and AHU-3.  AHU-2 happens to be a 100% OA unit for Kitchen makeup and it has much less winter cooling load (not surprising since it is 100% OA so it is 'economizing' all the time.   I also have modeled this project in Trace and the results in Trace have no winter cooling as expected (this project is a training exercise for me in eQuest.)

Any help is appreciated.

Jeremy Rapoza, P.E., LEED AP, Design EngineerI BVH Integrated Services I 860.286.9171 tel I 860.242.0236 fax I 50 Griffin Road South, Bloomfield CT 06002 I www.bvhis.com<http://www.bvhis.com/>

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