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Re: [TRNSYS-users] problem type 655 (chilled water flow rate)



Erwan,
  Type655 does consider the effect of ambient temperature; it is one of the two variables in the performance data file (the other variable is the desired chilled water outlet temperature). What you might be seeing, however, is that the routine that reads the performance data is able to interpolate performance within the range of data given but it cannot extrapolate beyond the range. If the highest ambient temperature in the data file is 30C and all of the ambient temperatures during the simulation are above 30C then you will always get the capacity and COP that correspond to to the performance at 30C.

  If that does not correct the problem, please send me the *.tpf file and the chiller data files that you are using and I will see if I can determine the cause of the problem.
Kind regards,
 David


On 8/24/2011 06:45, LIBIOT, Erwan wrote:

Dears all,

 

I'm using the type 655 "chilled water flow rate" from TESS library. First, I noticed an inversion between CAPACITY ratio and COP ratio in the external file (containing the chiller performance data).

Secondly, here my problem; this type do not consider the ambient temperature in the chiller capacity and COP calculations. In fact, this model always choose CAP and COP ratio values corresponding to the highest ambient temperature for a chilled water temperature. So, have you got an idea about how can I figure out this issue?

 

Thanks you


Erwan Libiot

 

De : Matt Duffy [mailto:duffy@tess-inc.com]
Envoyé : mardi 2 août 2011 14:49
À : luis Carlos vela garcia; trnsys-users@cae.wisc.edu
Objet : Re: [TRNSYS-users] problem type 655 (chilled water flow rate)

 

Dear Luis Carlos Vela,

That is fixed for TESS Libraries version 17.01 (you may see the version of the TESS Libraries that you have by viewing the names of their external DLL's in the ".\UserLib\ReleaseDLLs" directory or by looking at the 'Readme.html' file in the ".\Tess Models" directory). Thus, please make sure that you are using that version.

Best regards,

Matt Duffy

----- Original Message -----
From: "luis Carlos vela garcia" <lcarlosvg@hotmail.es>
Sent: Fri, July 29, 2011 16:24
Subject: [TRNSYS-users] problem type 655 (chilled water flow rate)


good day.

My name is Luis Carlos Vela colmbiano am a college student and Francisco José de Caldas District, has the license lacual TRNSYS V17. I am currently developing my graduation project and I have questions,
 
 
 
 TranSys attached image

 

 

when I choose the type chiller 655 and I will enter the input data see the following problem.
Water chiller units are degrees Celsius flexible rate, so my question is what units should I enter in this box as Celsius tablets are not units! of flow.


 
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