(4.136)

where U may depend on wind speed in analogy to (4.118). The collector gain is now given by $mathml$ where the first term is proportional to A, while the two last terms are proportional to Aa. Assuming now a fluid flow $mathml$ through the absorber, the expression for determination of the amount of energy extracted becomes [cf. (4.128)]

$mathml$ (4.137) ...

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