I read in an article that " The correlations used in solar radiation model are based on ASHRAE, H.C. Hottel, and S.C.S.G models." Anyone knows what does S.C.S.G stand for?
Since ASHRAE and H.C. Hottel are references, I think S.C.S.G is a reference too. Because the writer was talking about the correlations he used in his model and from where he got these correlations. Therefore, I couldn't figure out what was this (S.C.S.G) reference or what does stand for.