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<p class=MsoNormal><span style='font-size:12.0pt'>Dear all,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt'>I've been trying to simulate
a solar thermal system for reheat in EnergyPlus but encountered lots of
problems. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt'>The laboratory building
requires 6 ach at all times and strict temp and RH control. The original
arrangement has a gas boiler providing hot water at 80 degree c to reheat coils
sitting in zones. As a result of high humidy level and reduced sensible load at
night, the reheat energy shoots up horrendously, though reheat is also needed
during day time. The idea is to have a large solar collector array to cover the
roof space and a storage tank to store hot water for night use. The size of the
collector and storage system needs to be optimised to match the hot water need.
But to kick start, the solar collector is simulated as one whole piece (shading
surface:detached, around 1000m2) and parametric data is taken from the E+ dataset.
I have managed to get all the connections right by following the example file: a
mixed heater's (no heating capacity storage tank) source side connected to the
solar collector and use side to another mixed heater (auxiliary heater) and to
the rest of the hot water plant. But after running it a few times, I've got
very strange results. The solar collector's efficiency is extremely low, e.g.
0.00001 but outlet temperature goes up to 200 degree c (steam?). The storage
tank remains unfortunately cold. I suspect the large solar collector I put in the
model (around 1000m2) is only functioning as a parametrically standard one (2
to 3 m2) and the rest area is functioning as a bypass. I tried to put in a
small collector, same size and parameters as that's specified in the example
file, and found the output more sensible. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt'>In addition to ways to
correct my input to get sensible output, another question is in the case of
such a system how should it be sized in terms of tank storage capacity and
solar collector size and output temperature to better match the mostly night
reheat need. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt'>Any comments are appreciated.
<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt'>Thanks<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>WU
Xuchao</span></b><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Sustainable
Design Consultant</span><o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Arup</span></b><span
style='font-size:10.0pt'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>10
Hoe Chiang Road #26-01 Keppel Towers Singapore 089315</span><span
style='font-size:10.0pt'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>T
+65 6411 2500</span><span style='font-size:10.0pt'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>D +65
6411 2576</span><span style='font-size:10.0pt'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>F
+65 6411 2501</span><span style='font-size:10.0pt'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><a
href="http://www.arup.com/" title="http://www.arup.com/"><span
style='color:blue'>www.arup.com</span></a></span><span style='font-size:10.0pt'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>We
shape a better world</span><span style='font-size:10.0pt'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>Arup
Singapore Pte Ltd - Reg. No. 200100731M</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p>
</div>
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