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Bertrand,<br>
You will have to make the change from TRNEdit. First, generate
your *.dck file from the Studio, then open it using TRNEdit. Find the
solar collector. If you used a Type1a solar collector, the section of the
*.dck might look like the following:<br><br>
UNIT 2 TYPE 1<x-tab> </x-tab> Type1a<br>
*$UNIT_NAME Type1a<br>
*$MODEL .\Solar Thermal Collectors\Quadratic Efficiency Collector\No
Incidence Angle Modification\Type1a.tmf<br>
*$POSITION 115 151<br>
*$LAYER Main # <br>
PARAMETERS 9<br>
1<x-tab> </x-tab><x-tab>
</x-tab>! 1 Number in
series<br>
2.0<x-tab> </x-tab><x-tab>
</x-tab>! 2 Collector
area<br>
4.190<x-tab> </x-tab><x-tab>
</x-tab>! 3 Fluid
specific heat<br>
1<x-tab> </x-tab><x-tab>
</x-tab>! 4 Efficiency
mode<br>
50.0<x-tab> </x-tab><x-tab>
</x-tab>! 5 Tested flow
rate<br>
0.7<x-tab> </x-tab><x-tab>
</x-tab>! 6 Intercept
efficiency<br>
15<x-tab> </x-tab><x-tab>
</x-tab>! 7 Efficiency
slope<br>
0.0<x-tab> </x-tab><x-tab>
</x-tab>! 8 Efficiency
curvature<br>
1<x-tab> </x-tab><x-tab>
</x-tab>! 9 Optical Mode
1<br>
INPUTS 4<br>
0,0<x-tab> </x-tab><x-tab>
</x-tab>! [unconnected]
Inlet temperature<br>
0,0<x-tab> </x-tab><x-tab>
</x-tab>! [unconnected]
Inlet flowrate<br>
0,0<x-tab> </x-tab><x-tab>
</x-tab>! [unconnected]
Ambient temperature<br>
0,0<x-tab> </x-tab><x-tab>
</x-tab>! [unconnected]
Incident radiation<br>
*** INITIAL INPUT VALUES<br>
20.0 100.0 10.0 0. <br><br>
you need to make two changes. First, give the "collector area"
parameter a name instead of a value and second, create a constant that
sets the name to a value. The end result would be: (NOTE: I have
highlighted my changes in red)<br><br>
<font color="#FF0000">CONSTANTS 1<br>
CollArea = 2.0<br><br>
</font>UNIT 2 TYPE 1<x-tab> </x-tab> Type1a<br>
*$UNIT_NAME Type1a<br>
*$MODEL .\Solar Thermal Collectors\Quadratic Efficiency Collector\No
Incidence Angle Modification\Type1a.tmf<br>
*$POSITION 115 151<br>
*$LAYER Main # <br>
PARAMETERS 9<br>
1<x-tab> </x-tab><x-tab>
</x-tab>! 1 Number in
series<br>
<font color="#FF0000">CollArea</font><x-tab>
</x-tab>! 2 Collector
area<br>
4.190<x-tab> </x-tab><x-tab>
</x-tab>! 3 Fluid
specific heat<br>
1<x-tab> </x-tab><x-tab>
</x-tab>! 4 Efficiency
mode<br>
50.0<x-tab> </x-tab><x-tab>
</x-tab>! 5 Tested flow
rate<br>
0.7<x-tab> </x-tab><x-tab>
</x-tab>! 6 Intercept
efficiency<br>
15<x-tab> </x-tab><x-tab>
</x-tab>! 7 Efficiency
slope<br>
0.0<x-tab> </x-tab><x-tab>
</x-tab>! 8 Efficiency
curvature<br>
1<x-tab> </x-tab><x-tab>
</x-tab>! 9 Optical Mode
1<br>
INPUTS 4<br>
0,0<x-tab> </x-tab><x-tab>
</x-tab>! [unconnected]
Inlet temperature<br>
0,0<x-tab> </x-tab><x-tab>
</x-tab>! [unconnected]
Inlet flowrate<br>
0,0<x-tab> </x-tab><x-tab>
</x-tab>! [unconnected]
Ambient temperature<br>
0,0<x-tab> </x-tab><x-tab>
</x-tab>! [unconnected]
Incident radiation<br>
*** INITIAL INPUT VALUES<br>
20.0 100.0 10.0 0. <br><br>
Finally, select "New Table" from the "Parametrics"
menu in TRNEdit. On the left, you will see a list of all the variables
that you can add to the table. Move the ones that you want over to the
right hand side and set the number of different runs that you want to
make. A table should appear. Once you have set the values of CollArea,
save the table and select "Run Table" from the TRNSYS
menu.<br><br>
Cheers,<br>
David<br><br>
<br>
At 06:07 5/2/2007, tchanche fankam bertrand wrote:<br>
<blockquote type=cite class=cite cite="">Dear all,<br>
i am trying to perform a parametric study.<br>
i would like to know how to change a parameter into constant and
vary it for a parametric study.<br>
eg. the collector area<br>
Cheers, <br><br>
<br>
------------------------<br>
TCHANCHE FANKAM Bertrand<br><br>
C/O SUH Christopher<br>
22 kadmeas-BOTANIKOS<br>
Athens, GREECE<br>
mobile:+30 69 42 95 59 52<br><br>
<br>
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