Intercepted flux and the horizontal component of solar radiation
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For the first time a method is presented to actually measure the radiative flux intercepted by cylindrical and conical objects in radiation fields of any unknown angular distribution.
The horizontal component of solar radiationH is a newly introduced parameter expressed in Wm−2 and defined as specific radiative flux intercepted by the lateral surface of a vertical cylinder. The horizontal componentH can be measured and must be considered complementary to the vertical component of solar radiationG which is conventionally measured as “Global radiation”.
Radiative fluxes intercepted by cylindrical and conical objects are expressed as simple analytic functions ofG andH in any irregular radiation field. Before the introduction of the H-concept, when onlyG was measured, intercepted fluxes had to be approximated on the basis of assumed angular distributions of the radiation field.
The climatological characteristics ofH andG are different: under clear skies in the open field the H-climatology is more temperate than the G-climatology all over the world and in all seasons. In the radiative environment of elongate vertical bodies H is generally a more significant parameter thanG.
KeywordsSolar Radiation Open Field Angular Distribution Vertical Component Lateral Surface
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