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Check NOCT model implementation #917

@mjprilliman

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@mjprilliman

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A question on the implementation of the NOCT cell temeprature model equation used with the CEC performance models was presented in https://www.researchgate.net/publication/361463601_PV_Module_Operating_Temperature_Model_Equivalence_and_Parameter_Translation. Evaluate the implementation of the model based on the definitions presented in the SAM technical reference, the DeSoto model paper, and the Duffie and Beckman textbook. Confirm whether the POA irradiance used in the model should be before or after reflection effects, and consider how this definition effects the efficiency and absorptance-transmittance product variables used in the model.

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bugpvphotovoltaic, pvsam, pvwatts

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