期刊
SOLAR ENERGY
卷 76, 期 6, 页码 683-691出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.solener.2004.01.005
关键词
solar thermal systems; non-concentrating solar systems; angular selectivity
This paper explores the thermodynamic limits of solar thermal systems using absorber surfaces with high angular selectivity. It shows that theoretical considerations regarding the behavior of non-concentrating solar thermal systems are not enough in themselves to rule out their use in high-temperature applications. In fact, the paper demonstrates that the maximum theoretical thermal efficiency of a non-concentrating system may equal that of a concentrating system if the monochromatic directional emittance of its absorbing surface is sufficiently restricted. It is thus confirmed that the fundamental parameter that determines the ability of a solar-energy system to operate at high temperatures is not optical concentration, but angular selectivity of emittance. (C) 2004 Published by Elsevier Ltd.
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