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

[David BRADLEY]

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 at tess-inc.com]
> *Envoyé :* mardi 2 août 2011 14:49
> *À :* luis Carlos vela garcia; trnsys-users at 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 at 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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-- 
***************************
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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