Hi,
The SRCC tests both regular flat plate collectors (both air and water heating) and evacuated tube collectors. The test reports are here:
http://www.solar-rating.org/RATINGS/RATINGS.HTM
In the Directory of SRCC certified solar collector ratings.
You can also use the calculator to check the comparitive efficiency of evacs and flats:
http://www.builditsolar.com/References/Calculators/Collector/ColEfic.htm#efic
The bottom line is that there is very little difference.
What you want to do sounds like an interesting experiment, and I would certainly like to hear how it comes out, but I would not expect a whole lot of performance gain for the vacuum insulation.
Gary
Gary
gary@BuildItSolar.com
www.BuildItSolar.com
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