[Bldg-sim] Cooling Tower Approach

[Peters, Judith M via Bldg-sim]

Dan and Danielle,

Thank you for your excellent comments.  The results make more sense to me now.

Thanks again,
Judy


Judy Peters, PE LEED-AP BEMP
Energy Modeling Engineer
Daikin Applied
763.553.5155
judith.peters at daikinapplied.com<mailto:judith.peters at daikinapplied.com> | www.DaikinApplied.com<http://www.daikinapplied.com/>


From: Danielle Bond [mailto:danielle at ecapnet.com]
Sent: Monday, June 19, 2017 11:07 AM
To: Dan Nall
Cc: Peters, Judith M; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Cooling Tower Approach

In general, a smaller approach means the cooling tower is more efficiently rejecting heat, i.e. better performance. This overview is pretty good: http://spxcooling.com/pdf/TR-016.pdf

Best,
Danielle

--
Danielle Bond, Ph.D.
Energy Engineer, eCap Network
http://www.ecapnet.com/


On Mon, Jun 19, 2017 at 11:50 AM, Dan Nall via Bldg-sim <bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>> wrote:
If you input a tower with a lower approach but with the same fan power, you would wind up with less annual fan energy consumption, because your fan with the lower approach temperature would hit the minimum condenser water temperature at a higher wet-bulb temperature, allowing the fan to back off more hours of the year.
-----Original Message-----
From: "Peters, Judith M via Bldg-sim"
Sent: Jun 19, 2017 11:13 AM
To: "bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>"
Subject: [Bldg-sim] Cooling Tower Approach
I am looking for tips on how to properly compare tower approach temps.  Currently, I am comparing a 7 F approach with a 5 F approach.  The tower has 4 cells with 44 kW fan energy for each cell and a 10 F range.

Regardless of control parameters, the program shows less tower energy for a smaller approach and I was expecting the opposite.

Can anyone shed some light on this issue?

Thank you!



Judy Peters, PE LEED-AP BEMP
Energy Modeling Engineer
Daikin Applied
763.553.5155<tel:(763)%20553-5155>
judith.peters at daikinapplied.com<mailto:judith.peters at daikinapplied.com> | www.DaikinApplied.com<http://www.daikinapplied.com/>



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