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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.

Mohsen Darabi

Good question