Dependence on latitude of the relation between the diffuse fraction of solar radiation and the radiation and the ratio of global-to-extraterrestrial radiation for monthly average daily values
- Universidad Politecnica, Madrid (Spain)
An approach for the prediction of the monthly average daily diffuse radiation, {bar H}{sub d}, was proposed by Page in 1961. The Page method is based on the use of the linear correlation {bar H}{sub d}/{bar H} = c + d{bar H}/{bar H}{sub o}, where {bar H} and {bar H}{sub o} are, respectively, the monthly average daily values of global and extraterrestrial radiation, both on a horizontal surface. The values of c and d are a function of atmospheric conditions, cloud cover conditions/types, as well as latitude. In the present work the author studies the dependence on latitude of c and d for European locations with 36{degree}N < {gamma} < 61{degree}N (longitudes between 29{degree}E and 11{degree}W). The dependence is first studied using 28 values of c and d obtained using experimental values of {bar H} and {bar H}{sub d}. Next the dependence on {gamma} is studied using experimental values of {bar H} for 64 European locations, obtained for the period 1966-1975, and corresponding values of {bar H}{sub d} estimated using the European Community Solar Radiation Model (E.C.S.R.M.). In both cases a minimum for c vs. {gamma} and a maximum for d vs. {gamma} are obtained for similar values of {gamma}. Using the E.C.S.R.M. it is shown that both, the minimum and the maximum can be explained by the way {bar H}{sub d}/{bar H} and {bar H}/{bar H}{sub o} vary with {gamma}.
- OSTI ID:
- 6565778
- Journal Information:
- Solar Energy (Journal of Solar Energy Science and Engineering); (USA), Vol. 44:5; ISSN 0038-092X
- Country of Publication:
- United States
- Language:
- English
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