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Efficiency coefficients (aperture area): These three parameters describe the efficiency of the collector under certain conditions of irradiation and temperatures. The efficiency at an irradiation Gk, a mean collector temperature Tm and the ambient temperature Ta can be computed as follows:
η(x) = η0 – a1 * x – a2 * x^2 * Gk
where x = (Tm – Ta) / Gk
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