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Electronic Resource
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SAND Report: SAND77-0874, July 1977.
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Library's review
ABSTRACT:
Direct Normal, DN, radiation data is presently available for only a few sites in the country while total horizontal, TH, radiation is available for many locations. If a mathematical function relating DN and TH were established, solar engineers could estimate DN for any site for which TH
Direct Normal, DN, radiation data is presently available for only a few sites in the country while total horizontal, TH, radiation is available for many locations. If a mathematical function relating DN and TH were established, solar engineers could estimate DN for any site for which TH
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data. is available. Total radiated energy on a tilted surface, TT, is also of interest to solar engineers. A recently completed report [2] includes TT values for a surface tilted at 45° for 26 sites. A function relating TT and TH would permit one to estimate TT for sites where only TH data is available. This paper gives empirically derived functions relating DN and TH and TT and TH. Show Less