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<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Hello everybody,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>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:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:18.0pt'><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<ol style='margin-top:0cm' start=1 type=1>
<li class=MsoNormal style='mso-list:l0 level1 lfo1'><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>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?<o:p></o:p></span></font></li>
</ol>
<p class=MsoNormal style='margin-left:18.0pt'><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<ol style='margin-top:0cm' start=2 type=1>
<li class=MsoNormal style='mso-list:l0 level1 lfo1'><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>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?<o:p></o:p></span></font></li>
</ol>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<ol style='margin-top:0cm' start=3 type=1>
<li class=MsoNormal style='mso-list:l0 level1 lfo1'><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>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?<o:p></o:p></span></font></li>
</ol>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Your help would be greatly appreciated. Thanks in
advance.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Dipl.-Ing. Cagatay Berkyürek<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><st1:PlaceName w:st="on"><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>Technical</span></font></st1:PlaceName><font
size=2 face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial'> <st1:PlaceType
w:st="on">University</st1:PlaceType> of <st1:State w:st="on"><st1:place w:st="on">Berlin</st1:place></st1:State><o:p></o:p></span></font></p>
<p class=MsoNormal><st1:place w:st="on"><st1:PlaceType w:st="on"><font size=2
face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial'>Institute</span></font></st1:PlaceType><font
size=2 face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial'>
of <st1:PlaceName w:st="on">Energy</st1:PlaceName></span></font></st1:place><font
size=2 face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial'>
Engineering <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Marchstr. 18<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>10587 Berlin/Germany<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Tel: 030/314-28483<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>E-mail: akif.c.berkyuerek@tu-berlin.de<o:p></o:p></span></font></p>
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