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Patrick,<br>
I would think that the correct way of going about it (in TRNSYS)
would be to write a model of the wetted outermost layer of the roof to
take into account the evaporation, convection, and radiation that
occurs at all times (night or day) and then couple it to a BOUNDARY
wall (that models the remaining roof layers) . We've used the concept
in the past to model PCM wall materials and to model ground coupling.<br>
Best,<br>
David<br>
<br>
<br>
Patrick Wilkinson wrote:
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<p class="MsoNormal"><b><font face="Eras Light ITC" size="3"><span
style="font-size: 12pt; font-family: "Eras Light ITC"; font-weight: bold;">Has
anyone modeled a nighttime radiation cooling system, where the water is
sprayed
directly on the rooftop of the building, not through tubing/flat plate
collectors? If so, any ideas on how to model this in TRNSYS/Excel?<o:p></o:p></span></font></b></p>
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<p class="MsoNormal"><b><font face="Eras Light ITC" size="3"><span
style="font-size: 12pt; font-family: "Eras Light ITC"; font-weight: bold;">Any
information on the theoretical background would also help. I can only
seem to
find information regarding closed systems.<o:p></o:p></span></font></b></p>
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<p class="MsoNormal"><b><font face="Eras Light ITC" size="3"><span
style="font-size: 12pt; font-family: "Eras Light ITC"; font-weight: bold;">thanks<o:p></o:p></span></font></b></p>
<p class="MsoNormal" style=""><font face="Eras Light ITC" size="3"><span
style="font-size: 12pt; font-family: "Eras Light ITC";">Patrick
Wilkinson, P.E., LEED<sup>®</sup> AP<br>
Advanced Technology Group</span></font><o:p></o:p></p>
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<st1:City w:st="on"><font color="gray"><span style="color: gray;">Sherman</span></font></st1:City></span></font></st1:address><font
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