Abstract
A new correlation is developed to predict monthly mean daily global radiation on horizontal surfaces for locations with latitudes between 60°N and 70°N. The suggested equation expresses global radiation in terms of per cent possible sunshine. The applicability of the new correlation is tested by statistical methods and the results are compared with two other well established models, proposed by Rietveld and by Dogniaux and Lemoine. These two models perform poorly at latitudes between 60°N and 70°N, but the new global radiation vs sunshine correlation can be accurately applied to locations in the latitude range 60°N–70°N.
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