[Equest-users] Strange Winter Cooling with Chiller

YinRic cesseric at hotmail.com
Tue Aug 31 20:38:18 PDT 2010


I changed the "chilled water loop operation" from "standby" to "demand" and ran, the cooling energy in winter suddenly disappeared! I must say that I didn't really understand the implication of "standby". Now, the result looks great. 

 

Thanks guys!

 

Rick
 


From: mike at andelmanlelek.com
To: cmg750 at gmail.com; cj at enersave.ca
Date: Tue, 31 Aug 2010 12:36:09 -0400
CC: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Strange Winter Cooling with Chiller






Check your chilled water loop operation.  The default is standby, so your loop is running 24/7.  Pump energy is often enough of a load to the loop to require the chillers to cycle on.
 
Mike
 

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Carol Gardner
Sent: Tuesday, August 31, 2010 12:26 PM
To: Chris Jones
Cc: Equest User
Subject: Re: [Equest-users] Strange Winter Cooling with Chiller
 
I wonder if the electric loads are associated with pumps for your chilled water system? I'd Google eQUEST reports to see if Marlin or others have written about this. I suspect that it's just an auxiliary load associated with moving the chilled water, or cooling tower fans, that you needn't worry about.

Let us know what you find out.

Carol

On Tue, Aug 31, 2010 at 9:17 AM, Chris Jones <cj at enersave.ca> wrote:
Check the LOOP-OPERATION - STANDBY, DEMAND-ONLY, SNAP.
With STANDBY you may see electrical consumption when no system has a load.

At 08:12 AM 31/08/2010, YinRic wrote:
Hi All,

Have you happened to meet problem with strange cooling in winter when you choose chiller as cooling source?

I have a typical 2-storey office building (with no extraordinary internal cooling load) modelled using eQuest. Whenever I choose "chilled water coils" as cooling source, some cooling energy appears in the "Electric Consumption" graph for Jan and Feb, although the SS-I report indicates no sensible or latent cooling energy in these two months. When I change the cooling source into "DX Coils", the cooling energy in winter simply disappeared.

Attempting to fix the problem, in the "air-side system" window under wizard mode, all I used are default values to avoid wrong inputs, and I chose "no heating" in winter, but the problem still exist.

This is a LEED project approaching deadline. If anyone could help me out, that would be greatly appreciated.

Thanks,
Rick, LEED AP
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Chris Jones
14 Oneida Avenue
Toronto, ON M5J 2E3.
Tel.  416-203-7465
Fax. 416-946-1005


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-- 
Carol Gardner PE
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