Abstract
This paper presents a method for estimating the quantity of solar radiation available on surfaces with various orientations in the United States. Seasonal curves show the availability of solar radiation during cloudless days on surfaces with various orientations at or near sea level. Polynomials have been developed for curves of the horizontal surface. The ratios of solar radiation incident upon tilted surfaces to that incident on horizontal surfaces are presented in the form of curves for which polynomials have been developed. Curves and polynomials giving the percentage increase in solar radiation with altitude are shown; these curves and polynomials can be used to correct the values for conditions at or near sea level. A regression equation correlates the ratio of recorded to calculated cloudless day radiation and cloudiness. Comparisons are shown between the calculated cloudless day radiation determined from the curves and polynomials and recorded clear day radiation.
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