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<p>Ahmad,</p>
<p> There isn't really enough information in the screen captures
that you sent in order to check and see if there are connection or
parameter errors in the simulation. I would suggest that you look
at the qUseful output from Type71 and compare it (on a per unit
area basis) to the incident solar radiation when there is liquid
flowing through the collector. From this you can get an
instantaneous collector efficiency. Better yet you can integrate
qUseful and qIncident and compare those to get a longer term
average collector efficiency. The efficiency rather than the
collector outlet temperature will give you a better idea of
whether there are errors in the way that the simulation is set up.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
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<div class="moz-cite-prefix">On 06/02/2017 10:15, ahmad abbasian via
TRNSYS-users wrote:<br>
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Hello</p>
<p style="font-family: Calibri, Arial, Helvetica, sans-serif,
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I'm simulating a solar assisted heating system. I have used
type 71 (evacuated tube collector) for my model. The tested
flow ate is 0.014kgr/S.m2 and the area is 2m2 so the flow rate
is set to 0.028 kgr/S. The other parameters are based on the
two attached tables. I'm wondering that the outlet water
temperature is low which seems to be unacceptable. I think
that the water outlet temperature can be reach to around 100 C
in such collector, but the maximum temperature here is 40 C !
following is the inlet and outlet temperatures to collector.
pump is controlled using a differential controller to be
turned on whenever the outlet temperature is 5 C more than the
inlet temperature. What is wrong with my simulation? </p>
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Ahmad abbasianzadeh</div>
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Solar energy Researcher</div>
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<b>Harrisburg, Pensylvania</b></div>
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***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
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