[Equest-users] Waterside Economizer

[Sami, Vikram]

Varkie,
I took a look at your model. I think the reason you are getting zero flow in your condenser loop is that you only have one chiller (the water side economizer). When its not satisfying the whole load, it goes off, and there's no chiller to create loop demand (hence zero flow). If you add a chiller to the loop the error should go away.

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 Sethi, Amarpreet
Sent: Monday, June 28, 2010 6:22 PM
To: Varkie C Thomas
Cc: equest-users at lists.onebuilding.org; Jonathan Smith
Subject: Re: [Equest-users] Waterside Economizer

Varkie,

You need the water economizer –

"water economizer" = CHILLER
   TYPE             = WATER-ECONOMIZER
   CHW-LOOP         = "Chilled Water Loop"
   CHW-PUMP         = "WE pump"
   CW-LOOP          = "Condenser Water Loop"   ..


And a pump attached to the water economizer –

"WE pump" = PUMP
   CAP-CTRL         = VAR-SPEED-PUMP
   ..

Along with the chilled water loop and a condenser water loop.

I think the problem you are facing may be due to the 42deg temperature input.

Hope this helps.
Amarpreet

From: Varkie C Thomas [mailto:thomasv at iit.edu]
Sent: Monday, June 28, 2010 10:08 AM
To: Varkie C Thomas
Cc: Jonathan Smith; Sethi, Amarpreet; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Waterside Economizer

I am having a hard time getting �Chiller Type = Waterside Economizer� to work in eQ.  I received 2 messages recommending this as the solution.  I have 2 more saying that they have not been able to model WSE in eQ.  Please let me know if it is not supposed to work.

Unlike DOE2.1E this is the only minimum input required in eQ.  In this project during WSE operation we require a Clg-Twr leaving temp (Plate & Frame HX entering temp) of 42F so that the CHW temp leaving the HX is 44F or 46F.  The eQ default is 85F.  Even with this default and �Chiller Type = Waterside Economizer� I get the error message �Condenser Water Loop has Zero Design Flow�.

Unlike DOE2.1E there is no way of attaching a schedule for WSE operation.  I have attached eQ input-output �Without-WSE-1� and �With-WSE-2�; DOE2.1E definitions of WSE commands and keywords;  a sample DOE2.1E plant section input showing WSE; a schematic of Plate & Frame HX; and my eQ input for WSE and the resulting error message.  The attached project is dummy to test eQ for WSE.

Has anyone modeled WSE with eQ?  WSE works with DOE2.1E commands and keywords.  Does Waterside Economizer work with EnergyPlus (this project is also going to be modeled with E+ using Design-Builder interface for building and systems), TRACE or HAP

Varkie



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