[TRNSYS-users] Type 53

[Cagatay Berkyürek]

Hello everybody,

 

I am modelling a centrifugal chiller with trnsys type 53. I let the model to read the external data file, which is composed of X, Y and Z values as usual. The model works and gives the table of results which is composed of power, cooling load, water flows, COP…etc. But I have some problems and also questions:

 

 

1.	In my simulation model I define the evaporator leaving water temperature, evaporator water flow rate and condenser water flow rate as variables, I let type 53 to read these variables from the tables (for each variable one table composed of 20 different values) that I created by using data reader type 9a and I link these data readers to type 53 and printer type 65b adequately. Do you see any fundamental mistake with my model logic?

 

2.	In the case when I don’t use any variable using a data reader and just enter the parameter and input values and let the model read the external data file, I get only one constant result for each output value and the results in my graphic are only straight lines! I have the feeling that, the model should give various results for each output because of the definitions of X, Y and Z in the external data file. Could you write me your comment about this?

 

3.	My biggest problem is that the chiller power results calculated by the model are not same with the power values in the curve-fit    results which are calculated according to the X, Y and Z values in the external data file. My curve-fit results table is composed of only chiller power, but theoretically it should be composed of ∆T, Load and COP values, isn’t it? Where does this difference come from?

 

Your help would be greatly appreciated. Thanks in advance.

 

Dipl.-Ing. Cagatay Berkyürek

 

Technical University of Berlin

Institute of Energy Engineering 

Marchstr. 18

10587 Berlin/Germany

Tel: 030/314-28483

E-mail: akif.c.berkyuerek at tu-berlin.de

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