[Equest-users] Question: eQuest error of cooling coil leaving temperature for VAV

[Rob Bialobrzeski]

Not sure if you are still having trouble with this issue, but if so, eQuest
calculates the cooling coil leaving temperature as follows:

Cooling Coil Leaving Temp = Zone Entering Min Supply Temp. - Supply Fan
Delta T

So, your design CHW Temp has to be at least 6 degrees less than the Zone
Entering Min Supply Temp MINUS the Supply Fan Delta T.  

Hope that helps,
Rob
-------------------------------------
Rob Bialobrzeski
DMI
(781) 431-1100 extension 17
 

-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of
equest-users-request at lists.onebuilding.org
Sent: Monday, February 23, 2009 3:03 PM
To: equest-users at lists.onebuilding.org
Subject: Equest-users Digest, Vol 11, Issue 28

Message 6:
Date: Mon, 23 Feb 2009 13:54:47 -0500
From: Vikram Sami <VSami at lasarchitect.com>
Subject: Re: [Equest-users] NINJA-SPAM: Question: eQuest error of
	cooling	coil leaving	temperature for VAV
To: "Min-Hwan Yang" <yangm at kjww.com>,
	<equest-users at lists.onebuilding.org>
Message-ID:
	
<55BA83825A482144A8637F9CAA981F7612B184BC at las-mail.lordaecksargent.internal>
	
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Means your design CHW temp needs to be at least 6 degrees warmer than the
zone entering min supply temperature. So you can't have a CHW temp of 44
degrees and a supply temp of 49 degrees. 


Vikram Sami, LEED AP 
Direct Phone 404-253-1466 | Direct Fax 404-253-1366 
LORD, AECK & SARGENT ARCHITECTURE
1201 Peachtree Street NE, Suite 300, Atlanta, GA 30361 
Responsive Design ? Technological Expertise ? Exceptional Service 
Please visit our new website | www.lordaecksargent.com
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-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Min-Hwan
Yang
Sent: Monday, February 23, 2009 11:24 AM
To: equest-users at lists.onebuilding.org
Subject: NINJA-SPAM:[Equest-users] Question: eQuest error of cooling coil
leaving temperature for VAV

Hi, I am new here.

Does anyone know what's causing the following error and how to fix in the
VAV systems?
"cooling coil leaving temperature must be at least 6F higher than entering
water temp."

Thanks in advance.

Min-Hwan Yang, CPD, LEED AP
Mechanical Engineer | yangm at kjww.com

200 West Jackson Boulevard, Suite 1200 | Chicago, Illinois 60606
312-294-0501 | Direct: 312-356-3750?|?Fax: 312-294-0003
www.kjww.com


"One of the Best AEC Firms to Work For"
Building Design + Construction, March 2008