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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><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'>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>
<ol style='margin-top:0cm' start=1 type=1>
<li class=MsoNormal style='mso-list:l3 level1 lfo3'><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>
<li class=MsoNormal style='mso-list:l3 level1 lfo3'><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>
<li class=MsoNormal style='mso-list:l3 level1 lfo3'><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'>Your help would be greatly appreciated. Thanks in
advance.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><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:place w:st="on"><st1:State w:st="on">Berlin</st1:State></st1:place><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: <st1:PersonName w:st="on">akif.c.berkyuerek@tu-berlin.de</st1:PersonName><o:p></o:p></span></font></p>
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