Evaluation of models to predict insolation on tilted surfaces

Details Evaluation of models to predict insolation on tilted surfaces Evaluation of models to predict insolation on tilted surfaces

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978stin...7825025k&link_type=abstract

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Mathematics

Flat Surfaces, Insolation, Solar Radiation, Mathematical Models, Slopes, Sunlight

Scientific paper

An empirical study was performed to evaluate the validity of various insolation models which employ either an isotropic or an anisotropic distribution approximation for sky light when predicting insolation on tilted surfaces. Data sets of measured hourly insolation values were obtained over a six-month period using pyranometers which received diffuse and total solar radiation on a horizontal plane and total radiation on surfaces tilted toward the equator at 37 deg and 60 deg angles above the horizon. Data on the horizontal surfaces were used in the insolation models to predict insolation on the tilted surface; comparisons of measured versus calculated insolation on the tilted surface were examined to test the validity of the sky light approximations. It was found that the Liu-Jordan isotropic distribution model provides a good fit to empirical data under overcast skies but underestimates the amount of solar radiation incident on tilted surface under clear and partly cloudy conditions. The anisotropic-clear-sky distribution model by Temps and Coulson provides a good prediction for clear skies but overestimates the solar radiation when used for cloudy days. An anisotropic-all-sky model was formulated in this effort which provided excellent agreement between measured and predicted insolation throughout the six-month period.

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