answers with references please ....
Dear Hamoda
I attached some papers describe the loss in the flat plate solar collectors.
And a review paper of the last ten years experimental results.
I hope you find them useful.
Best Regards
Gamal
You can also check the following links and atatched file:
1. Analysis of Thermal Losses in the Flat-Plate Collector of a Thermosyphon Solar Water Heater
http://scialert.net/fulltext/?doi=rjp.2007.35.41
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.594.2491&rep=rep1&type=pdf
Article Evaluation of heat loss coefficients in solar flat plate collectors
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