Abstract
Abstract Taking into consideration the wavelength dependence of the spectral radiative characteristics of an absorbing plate and a transparent plate which are the main components of a flat-plate solar collector, the performance of the solar collector was analysed from the viewpoint of te heat balance on the absorbing and transparent plates based mainly on the radiation heat transfer under the steady state. Two sorts of hand-made solar collectors with selective and non-selective wavelength characteristics were constructed to compare the analytical result with a long-term experiment outdoors. The calculations compared well with the measurements for both the selective and the non-selective collectors, and it was thus shown that the prediction method could generally be applied to evaluate the collector's performance.
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