[Equest-users] why more heating usage with evaporative cooler

[Keith Swartz]

Yitian,

The humidity control in eQUEST is in the "Basics" tab for the air system in the detailed edit mode. Unfortunately humidity control is not available for an evaporative cooling system. See the lower right corner in the image below.

[cid:image003.jpg at 01CCCEE5.7CA43270]

You can get a sense for space humidity levels from report SS-N to see if humidity control may be an issue. If you find it is an issue, you may need to edit the .inp file. Search the DOE-2 help for keywords like MAX-HUMIDITY and MIN-HUMIDITY for more details. The increased heating might be caused by something else besides humidity control. That's just the first thing that came to my mind.
________________________________
Keith Swartz, P.E., LEED AP

Energy Engineer / Senior Project Manager
Energy Center of Wisconsin
455 Science Drive, Suite 200, Madison, WI 53711
Phone: 608.238.8276 x123
Fax: 608.238.0523

The Buildings Team
Design decisions through energy, economics and emissions analysis.
www.ecw.org/Buildings<http://www.ecw.org/Buildings>

Energy Center University
Your gateway to sustainable design training and online education programs.
www.ecw.org/university/<http://www.ecw.org/university/>
From: Yitian Zhu [mailto:yitian at efficiency20.com]
Sent: Monday, January 09, 2012 1:53 PM
To: Keith Swartz
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] why more heating usage with evaporative cooler

Keith,

Thank you very much for replying this.

I've actually did some investigate into this issue and had some ideas about possible solutions and, I thought it could because that Evaporative Cooler runs even during heating season, but since I have the same setting of cooling & fan schedule for DX Coil or Chilled Water Cooling, why would EVP Cooler have this problem? And which input represents the humidity control of EVP Cooler? I wonder which input could determine the set point between cooling and heating season? Or, I should basically create separated seasons for the cooling,heating & fan schedule? I guess it would be unreliable.

Thank you Again for your help!

Best,

Yitian

Energy Analyst
Efficiency 2.0

On Mon, Jan 9, 2012 at 12:47 PM, Keith Swartz <kswartz at ecw.org<mailto:kswartz at ecw.org>> wrote:
Yitian,

Is the evaporative cooler also controlling the humidity during the heating season? If so, that might explain it. More heating would be needed to compensate for the cooling effect of adding cold moisture to the airstream.

________________________________
Keith Swartz, P.E., LEED AP

Energy Engineer / Senior Project Manager
Energy Center of Wisconsin
455 Science Drive, Suite 200, Madison, WI 53711
Phone: 608.238.8276 x123<tel:608.238.8276%20x123>
Fax: 608.238.0523<tel:608.238.0523>

The Buildings Team
Design decisions through energy, economics and emissions analysis.
www.ecw.org/Buildings<http://www.ecw.org/Buildings>

Energy Center University
Your gateway to sustainable design training and online education programs.
www.ecw.org/university/<http://www.ecw.org/university/>
From: Yitian Zhu [mailto:yitian at efficiency20.com<mailto:yitian at efficiency20.com>]
Sent: Friday, January 06, 2012 4:01 PM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] why more heating usage with evaporative cooler

Hi,

I'm new to eQuest, recently I'm modeling a office building with evaporative cooler, I did a sample test and found out that, for the same building, significantly more heating is consumed with the model using evaporative cooler than others using DX coil or chilled water cooler. Does anybody noticed that and, why is that?

Great thanks!

Yitian

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