1- How can we calculate the heat loss coefficient U_L and the removal factor F_R of a heat pipe evacuated tube solar collector?
2- In which case we can consider that each one of them (U_L and F_R) are constant?
Thank you
J. A. Aguilar-Jiménez
Dear Grissa,
You can refer to this documents:
Article Solar Energy Engineering
Article Modeling, Construction, and Experimentation of a Compound Pa...
Article Effect of orientation of a CPC with concentric tube on efficiency
This documents can help you to establish the equations related to UL and FR coefficients, the first one is a book widely used in this topics.
Greetings.
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