The effect of cloudless atmospheres on the luminous efficacy of beam, diffuse, and global radiation
Conference
·
OSTI ID:109875
- Florida Solar Energy Center, Cape Canaveral, FL (United States)
A detailed analysis of the different factors affecting luminous efficacy under cloudless skies is performed using a spectral radiation model. The radiative and photometric fluxes for a large number of atmospheric conditions and solar zenith angles are integrated numerically. Aerosols and water vapor are found to be the most important factors. Ozone, nitrogen dioxide, and the station`s pressure are generally of secondary importance. Other potential factors are also discussed (limits of the spectral integration, ground albedo, and circumsolar radiation). Comparisons against previously published predictions of the direct beam efficacy are also presented. The present analysis may be used to test the reliability of experimental determinations of the efficacy if the local atmosphere is well characterized. Although feasible, a complete efficacy model might be more complex than a direct modeling of just the illuminance components.
- OSTI ID:
- 109875
- Report Number(s):
- CONF-950725--; ISBN 0-89553-167-4
- Country of Publication:
- United States
- Language:
- English
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