The Experts below are selected from a list of 150591 Experts worldwide ranked by ideXlab platform
Samuel J Hile - One of the best experts on this subject based on the ideXlab platform.
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Effective Incidence angles of sky diffuse and ground reflected irradiance for various Incidence angle modifier types
Solar Energy, 2013Co-Authors: Ehud Strobach, D Faiman, Samuel James Bader, Samuel J HileAbstract:Abstract A logical contradiction is pointed out involving the employment of some commonly used formulae for Effective diffuse and reflected angles, when simulating the total irradiance on a tilted solar collector, in situations where the Incidence angle modifier of the collector is known. By re-deriving the appropriate formulae for these Effective Incidence angles, it is found that the error involved in using the commonly used formulae is quite small in most practical cases. Differences are particularly small in the case of conventional photovoltaic panels, but may reach figures in the neighborhood of 5% for solar-thermal collectors.
Christian Gueymard - One of the best experts on this subject based on the ideXlab platform.
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A simplified model for the computation of radiation transmission through a series of semi-transparent plates
Solar Energy, 2003Co-Authors: Christian GueymardAbstract:Abstract An approximation of the Fresnel and Stokes equations is proposed in order to simplify the calculation of transmitted energy through windows consisting of up to four layers. The transmittance is obtained as a product of the normal Incidence transmittance (given as a function of the number of plates, their thickness, and extinction coefficient) and the normalized transmittance (given as a function of the same parameters and of the Incidence angle). By comparison with theory and fifth-order polynomials, the proposed model appears to give fairly accurate predictions for a wide range of parameter values, corresponding to most frequently used glazings. The proposed model may be used in conjunction with an Effective angle of Incidence if mean daily transmittance values are needed. Particularly, an equation giving the Effective Incidence angle for diffuse radiation is derived from integrations using typical sky radiance patterns. This Effective angle may be markedly different from 60° during clear sky conditions. The model may also be extended to the case of plastic covers with a refraction index different from that of glass. The model accuracy is maintained when the plastic cover has up to two layers of a clear material with a small absorption coefficient.
Ehud Strobach - One of the best experts on this subject based on the ideXlab platform.
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Effective Incidence angles of sky diffuse and ground reflected irradiance for various Incidence angle modifier types
Solar Energy, 2013Co-Authors: Ehud Strobach, D Faiman, Samuel James Bader, Samuel J HileAbstract:Abstract A logical contradiction is pointed out involving the employment of some commonly used formulae for Effective diffuse and reflected angles, when simulating the total irradiance on a tilted solar collector, in situations where the Incidence angle modifier of the collector is known. By re-deriving the appropriate formulae for these Effective Incidence angles, it is found that the error involved in using the commonly used formulae is quite small in most practical cases. Differences are particularly small in the case of conventional photovoltaic panels, but may reach figures in the neighborhood of 5% for solar-thermal collectors.
D Faiman - One of the best experts on this subject based on the ideXlab platform.
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Effective Incidence angles of sky diffuse and ground reflected irradiance for various Incidence angle modifier types
Solar Energy, 2013Co-Authors: Ehud Strobach, D Faiman, Samuel James Bader, Samuel J HileAbstract:Abstract A logical contradiction is pointed out involving the employment of some commonly used formulae for Effective diffuse and reflected angles, when simulating the total irradiance on a tilted solar collector, in situations where the Incidence angle modifier of the collector is known. By re-deriving the appropriate formulae for these Effective Incidence angles, it is found that the error involved in using the commonly used formulae is quite small in most practical cases. Differences are particularly small in the case of conventional photovoltaic panels, but may reach figures in the neighborhood of 5% for solar-thermal collectors.
Samuel James Bader - One of the best experts on this subject based on the ideXlab platform.
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Effective Incidence angles of sky diffuse and ground reflected irradiance for various Incidence angle modifier types
Solar Energy, 2013Co-Authors: Ehud Strobach, D Faiman, Samuel James Bader, Samuel J HileAbstract:Abstract A logical contradiction is pointed out involving the employment of some commonly used formulae for Effective diffuse and reflected angles, when simulating the total irradiance on a tilted solar collector, in situations where the Incidence angle modifier of the collector is known. By re-deriving the appropriate formulae for these Effective Incidence angles, it is found that the error involved in using the commonly used formulae is quite small in most practical cases. Differences are particularly small in the case of conventional photovoltaic panels, but may reach figures in the neighborhood of 5% for solar-thermal collectors.