Abstract
A procedure is presented here for designing flat-plate collectors for a solar earth heat pump. Equations are derived from fundamental principles for converting direct solar radiation incident on horizontal planes to south facing planes tilted 0° to 90° from the vertical. Brooks' empirical equation for the inclusion of diffuse radiation has been used to determine the total insolation incident on the collector. His equation for converting total insolation received on a horizontal plane surface to a vertical surface at Boston, latitude 40°N is assumed to be applicable for other latitudes, since the equation is based only on observation, and the constants involved should not vary with latitude. It is shown here that the angular function in Brook's equation is a function of solar altitude and solar azimuth angle only, and therefore is independent of the angle of tilt. Numerical calculations are included in the paper, and performance curves are presented. The method developed may be used in designing flat-plate collectors for any application.
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