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At 04:52 PM 4/24/2004 -0500, Jeff Haberl wrote:<br><br>
<blockquote type=cite class=cite cite><font face="arial" size=2 color="#000080">I'm
afraid that this is more complicated that it seems. However, I'm pleased
to say help is on its way. Mr. Sakkara Rasisuttha, a Ph.D. candidate at
TAMU is completing his PhD thesis on the use of a triple-effect solar
collector that collects heat during the day along with electricity, and
then can be used to reject heat at night. His work includes experimental
work to determine the collector properties, which show, as expected, that
an unglazed collector is not a good heat collector, but is a good heat
rejector. Therefore, it would appear that one might want to consider a
thin plastic cover over the PV collector to boost the efficiency of the
thermal collection. A paper on this has been submitted to the IBPSA USA
conference in Boulder this summer. Thesis due out
shortly.</font></blockquote><br>
Due to a research project with the National Renewable Energy Laboratory,
we've actually developed these models for TRNSYS in the past couple of
months. We have both glazed and un-glazed versions of the
collectors in both air-heating (air channel) and water-heating
(plate-tube) versions. We handled the PV relatively simply as our
focus was more on the thermal application (the PV efficiency is
calculated from one of several methods based on the incident radiation
and calculated mean cell temperature).<br><br>
These models will be available for TRNSYS 16, which is due out in a few
weeks, and will become part of the TESS component libraries for
TRNSYS.<br><br>
Jay Burch (NREL) and I have also written a paper, to be presented
shortly, on a study we did together investigating the impacts of
un-glazed PV/T collectors for every city in the TMY-2 data set. The
paper looks at the impact on heating, night cooling, and electricity
production for a residential application. The residential building
is based on the Building America guideline and the building
characteristics (slab insulation, attic insulation, wall construction,
window types etc.) change with location.<br><br>
E-mail me if you have any questions and I can also provide the reference
for the paper.<br><br>
Jeff<br>
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