Abstract
Solar central receivers which utilize solid thermal carriers such as sand or small refractory particles for direct absorption of concentrated solar radiation have been investigated at several laboratories. In the central receiver concept a field of tracking mirrors (heliostats) is used to focus solar energy onto a receiver mounted atop a tower. A possible receiver configuration is a cavity in which a falling sheet of solid particles is directly irradiated by the concentrated solar flux passing through the aperture. Regardless of the particular geometry, the radiative transfer within the falling particle curtain must be studied in order to determine the net radiative heating rate for the particles A discrete ordinate radiative transfer model has been applied to study the radiative coupling within the falling particle curtain. The model determines how much energy is absorbed by the particles, how much is transmitted to the rear wall of the receiver, and determines the effects of particle scattering and ther...
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