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Re: [TRNSYS-users] problem about type 51 cooling tower (solarabsorption system)



Hello Matt,

1. Depends on the design of the actual system, but yes, most of the time it is pumped to a fan coil. You should be able to find a fan/cooling coil in the TESS HVAC Library or the TRNSYS Standard HVAC Lib.

2. That is a correlation where "c" and "n" are generated from published data points from the actual cooling tower - Type51a is the other mode of the cooling tower where the user provides a data file to accomplish this, and the "c" and "n" are printed to the *.lst file.  A couple of years ago, I considered a nominal 240 ton tower, and its coefficient was c=1.36 and exponent was n=-0.937. I believe these are the default values for Type51b in TRNSYS 17.

Best regards,

Matt Duffy

----- Original Message -----
From: "Matt Wang" <jaochen88@hotmail.com>
Sent: Fri, February 4, 2011 11:42
Subject: [TRNSYS-users] problem about type 51 cooling tower (solarabsorption system)

 
Dear all,
 
I am a beginner and am trying to model a solar absorption system with solar collectors, storage tank, backup heater, absorption chiller and cooling tower in TRNSYS 16.  
I have looked up the archive and still have a couple of questions: 
 
1) When the chilled water is generated and pumped to the load, should there be any fan coil between the chiller and the house for space cooling? I couldn't find any type that is about fan coil.
 
2) I am doing with type 51b where c=2.3 and n=-0.72 (default values). I got an error message of "the correlation for the saturation temperature used in the cooling tower model was used with an enthalpy value outside the allowable range."  Can anyone suggest me where the problem could be?
 
Thank you...
 
Matt
!
 
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