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:
- 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?
- 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?
- 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@tu-berlin.de