Where can I find values of different heat loss coefficients for different solar collectors such as ETC, PTC, CPCs and FPCs etc.
a0 is solar collector thermal efficiency, a1 and a2 are thermal loss of solar collector, which came from testing data as shown the example in below figure. you can found this values in the specifications of each company.
thanks a lot....
Belessiotis, V., Harambopoulos, D., 1993. Testing solar water heating systems in Athens, Greece, Solar Energy 50(2), 167-177.
is a first source, but it's difficult to get this kind of data.
If you get some other source please share.
May useful option for FPC and ETC
http://www.solarenergy.ch/
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