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Abstract

The subject of the research was the determination of the precision of the calculation of the energy output of flat plate solar collectors, when a data reduction is used in which the correlation between irradiance and temperature of the ambient air is conserved. (Method Dr. Kesselring: the reduced data are given through "mean useful radiation density functions" (MURD functions), here used in a simplified version: called radiation energy distributions (RED functions). The experimental test of the applicability of the collector efficiency as a function of T*, and the application of the RED function method for a meteorological data set of one year show that this method can well be applied for the calculation of the collector heat output for fixed collector temperatures. Small deviations occur in comparison with a detailed simulation programme they could in part be due to an imperfect correspondence of the basic physical parameters used in the simulation calculation with the coefficients of the efficiency curve eta (T*). This report also compares the RED function method with other methods based on reduced data sets, especially cumulative radiation frequencies curves (CFC). So far all results refer to the collector heat output for fixed collector temperatures.

Additional information

Authors: KOCH H R KERNFORSCHUNGSANLAGE JULICH GMBH, JULICH (GERMANY), KERNFORSCHUNGSANLAGE JULICH GMBH, JULICH (GERMANY)
Bibliographic Reference: EUR 9484 EN (1984) MF, 20 P., BFR 120, BLOW-UP COPY BFR 150, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989124002700 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en
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