Thank you very much for the explanation Ty,
But I have another doubt, could you help me to solve it? I have been reviewing the equation proposed by the SAM manual (Equation 2.42 of the manual:
www.nrel.gov/docs/fy11osti/51825.pdf) for the angle of incidence modifier. The IAM coefficients for the Euro Trough ET150 collector shown by SAM are 1; 0.0506; -0.1763 and 0 ; however, according to what is stated in this article(
citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.847.8570&rep=rep1&type=pdf) the coefficients for that same collector model are 1; 0.000884 and - 0.00005369 . So why the different values of the coefficients if the collector model is the same ?
On the other hand, in the simulation I am working on I use a commercial collector different from the ones in the program, and I have no information of the IAM coefficients of this specific collector; would it be feasible to use values of the coefficients of the collector models available in SAM or maybe there are standard values ?
Regards,
Willian