Applications Simple Model of the Atmospheric Radiative Transfer of Sunshine (SMARTS)



comparison of direct normal, diffuse horizontal , global horizontal spectra predicted smarts v2.9.2 , measured rotating shadowband spectroradiometer (rss) @ arm cart site in oklahoma; air mass 2 specific test.


smarts version 2.9.2 selected prepare various reference terrestrial spectra, have been standardized astm under designations g173, g177 , g197, , iec under 60904-3. latter standard represents spectral distribution of global irradiance incident on 37° tilted surface facing sun @ air mass of 1.5. integrated irradiance amounts 1000 w/m. standard spectrum mandated iec evaluate rating of photovoltaic (pv) solar cells in absence of optical concentration. pv cells requiring concentration, referred cpv cells, evaluated against direct spectrum @ air mass 1.5 described in astm g173. spectrum integrates 900 w/m. reasons behind selection of atmospheric , environmental conditions led development of astm g173 described in scientific paper. smarts version 2.9.2 considered adjunct standard g173 astm. further details on use of smarts pv or cpv applications available in other publications. in particular, model used evaluate real-world efficiencies of pv or cpv modules , evaluate mismatch factors.


the reference spectra in astm g197 have been developed evaluate optical characteristics of fenestration devices when mounted vertically (windows) or on structures inclined @ 20° horizontal (skylights on roofs).


the reference spectrum in astm g177 limited global irradiance in ultraviolet (280–400 nm), , corresponds high-uv conditions encountered in arid , elevated sites, such in southwest usa. spectrum used reference testing degradation , durability of materials.








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