This could starts with the incoming solar radiation, characteristics of the cover and box sides, absorber behavior, and useful energy gained through the working fluid.
Dear Saad,
Just think by mean of energy balance.
Ein = Eout
Incoming energy decided by Solar irradiance come to your collector. Your collector will be an heat exchanger which performance depend on collector area, material, etc. so you can estimate your collector energy conversion efficiency.
Output energy should be your heat load, or your storage system.
I recommend you to read following book as reference:
J. A. Duffie, W. A. Beckman, “Solar Engineering of Thermal Processes”, third edition, John Wiley & Sons, Inc., New York, 2006
The solar collector performance measures in terms of heat energy i.e know as collector efficiency.it is how much the amount of solar irradiation falling on collector surface got converte into heat energy
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