[Equest-users] Question on eQuest Modeling DX Cooling, with Bug?

[Nathan Miller]

I seem to remember running into this before myself. I would check the
default curves for the DX vs. evaporative cooling. I think eQUEST assumes
a much worse partial-load performance for the evaporative curve. 

 

Nathan Miller, PE, LEEDRAP

Senior Energy Engineer/Mechanical Engineer

 

D 206-788-4577

 <http://www.rushingco.com/> www.rushingco.com

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Guoguang
Le
Sent: Tuesday, September 14, 2010 5:41 PM
To: Carol Gardner
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Question on eQuest Modeling DX Cooling, with
Bug?

 



Carol, I attched files for your review. If it is true, then eQuest has
some bugs.

Thanks for your time.

Best regards,

 

James
--- On Mon, 9/13/10, Guoguang Le <jamesle_tx at yahoo.com> wrote:


From: Guoguang Le <jamesle_tx at yahoo.com>
Subject: Re: [Equest-users] Question on eQuest Modeling DX Cooling, with
Bug?
To: "Carol Gardner" <cmg750 at gmail.com>
Cc: equest-users at lists.onebuilding.org
Date: Monday, September 13, 2010, 7:35 PM


Hi Carol,

 

I have attached two inp files, one for Air cooled condenser model with EER
9.9 and another one for Evap Cooled condenser with EER 11.

 

I created these files with eQuest Wizard mode. If you move forward to
detailed mode, you will find "Cooling Electric Input Ratio" is 0.2911
btu/btu in EER 9.9 model and 0.2580 btu/btu in EER 11 model. 

 

If you run simulation, the result for EER 9.9 air cooled model is $242,752
and for evap Cooled model is $243,127. (I did not change the data on
"Cooling Electric Input Ratio".)

 

If I change the data in the field of "Cooling Electric Input Ratio" as
0.3444 for EER 9.9 air cooled model and 0.3100 for EER 11 evap cooled
model. The result is $245,342 for EER 11 Evap cooled model and $244,726
for EER 9.9 Air Cooled model.

 

The conclusion is EER 11 evap cooled model is worse than EER 9.9 air
cooled model.

 

Can you help figure it out?

Best regards,

 

James

 

I believe that there are many Guru in the web. Thanks for your time!

 

 

 


--- On Sun, 9/12/10, Carol Gardner <cmg750 at gmail.com> wrote:


From: Carol Gardner <cmg750 at gmail.com>
Subject: Re: [Equest-users] Question on eQuest Modeling DX Cooling, with
Bug?
To: "Guoguang Le" <jamesle_tx at yahoo.com>
Cc: equest-users at lists.onebuilding.org
Date: Sunday, September 12, 2010, 9:11 PM

Not likely. Send a copy of your .inp and .pd2 files for help.

Carol

On Sun, Sep 12, 2010 at 6:10 PM, Guoguang Le <jamesle_tx at yahoo.com
<http://us.mc501.mail.yahoo.com/mc/compose?to=jamesle_tx@yahoo.com> >
wrote:



To all,

I have two energy models on DX cooling for a same building, one is with
air cooled and another with evaporation cooling. The EER is 9.9 for air
cooled condenser and  11 for evaporation cooled condenser. The final
result I got is that it is the low cost to run air cooled condenser DX
with EER 9.9 than evaporation cooled condenser DX with EER 11. I am
wondering whether eQuest has bug or not. Anyone could figure it out?

Best regards,

James

 

 


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nebuilding.org>  <equest-users-request at lists.onebuilding.org
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Date: Sunday, September 12, 2010, 2:03 PM

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Today's Topics:

   1. Re: eQUEST 3.64 - Modeling Procedures Quick Reference Guide
      (Chris Jones)
   2. Re: eQUEST 3.64 - Modeling Procedures Quick Reference Guide
      (Brian Fountain)

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-- 
Carol Gardner PE

 

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