[TRNSYS-users] Cooling tower TYPE 510 model malfunctions

[David BRADLEY]

Jing,
   Thank you for the file and first I want to say that your simulation 
is very well put together. You avoided a lot of the pitfalls and traps 
that are common sources of errors! Well done.

   I had a look at your simulation and found that during those few 
periods of the year when the water is coming out of the tower slightly 
hotter than it goes in are just because the ambient temperature and RH 
are so high at those times that the tower can't do any cooling. The way 
that a closed circuit tower works is that water is sprayed over the 
tubes that contain the water that is being cooled. As water evaporates 
off the tubes, it cools the tubes and thus the water in them. If it gets 
too hot and humid out, however, there isn't much evaporation off the 
tubes and consequently there isn't any cooling.
Best,
  David


On 5/1/2014 10:11, Jing Hong wrote:
> David,
> Thanks! Here is the machine schedule, as attached.
>
>
> On Wed, Apr 30, 2014 at 4:35 PM, David BRADLEY <d.bradley at tess-inc.com 
> <mailto:d.bradley at tess-inc.com>> wrote:
>
>     Jing,
>       Could you please send me the file "Machine schedule.sl7" in
>     addition to the two that you already sent (no need to copy the
>     entire list).
>     Best,
>      David
>
>
>     On 4/29/2014 13:41, Jing Hong wrote:
>>     Dear all,
>>     I am trying to test a cooling tower. As attached, I have a
>>     simplified cooling tower system with my own control strategy. But
>>     when the cooling tower is continuously working, the fluid outlet
>>     temperature of cooling tower will be higher than the return. I
>>     didn't figure out which part wrong.
>>     If you have any experience of this situation before, please let
>>     me know. It will be very helpful for me. I appreciate.
>>     Best wishes,
>>     Jing Hong
>>
>>     -- 
>>     Doctoral Student
>>     University of Wisconsin-Milwaukee
>>     School of Architecture and Urban Planning
>>
>>
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>
>     -- 
>     ***************************
>     David BRADLEY
>     Principal
>     Thermal Energy Systems Specialists, LLC
>     22 North Carroll Street - suite 370
>     Madison, WI  53703 USA
>
>     P:+1.608.274.2577  <tel:%2B1.608.274.2577>
>     F:+1.608.278.1475  <tel:%2B1.608.278.1475>
>     d.bradley at tess-inc.com  <mailto:d.bradley at tess-inc.com>
>
>     http://www.tess-inc.com
>     http://www.trnsys.com
>
>
>
>
> -- 
> Doctoral Student
> University of Wisconsin-Milwaukee
> School of Architecture and Urban Planning

-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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