[Equest-users] Review Requested

[Sami, Vikram]

Just to add to what Eddie said - you will spec OA from only when you are borrowing outside air from another system (Like with a DOAS). I've actually never seen this before (where you specify OA-From as the same system). What its probably doing is taking your return air as OA (at around 78) and cooling it (and taking moisture out of it).

I would have thought it would give you an error.

Vikram Sami, LEED AP
Sustainable Design Analyst
1382 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 Eddie Corwin
Sent: Thursday, September 09, 2010 3:26 PM
To: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Review Requested

In both of your HVAC systems you have "Outdoor Air From System" object specified.  In most cases, you will want to leave this object blank. The only time would want to use that object if, for example, you were taking the return air from one system, and using it in another, separate, system.  I am pretty sure that in your case, especially in the labs, all of the air will be coming from the outside, or will be recirculated within the same system.

If you reset those values to their default you get much better cooling results, but you also get heating in the summer, which is another issue you need to look at in more detail.  The "Outdoor Air From System" object is found in your HVAC system --> Outdoor Air --> Outdoor Air and Economizer

-Eddie

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Subject: Equest-users Digest, Vol 30, Issue 13

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