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Spectral selectivity and accelerated life testing of Al‐PbS solar selective surfaces
Author(s) -
Thangaraj R.,
Gadgil S. B.,
Gupta B. K.,
Iyer J. Vaidhyanathan,
Agnihotri O. P. A.
Publication year - 1982
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4440060208
Subject(s) - thermal emittance , selective surface , selectivity , absorptance , emissivity , materials science , outgassing , irradiation , coating , thermal , ultraviolet , optics , optoelectronics , analytical chemistry (journal) , chemical engineering , chemistry , composite material , reflectivity , meteorology , catalysis , organic chemistry , beam (structure) , physics , nuclear physics , engineering
High absorptance and low thermal emittance selective surfaces have been formed by evaporating lead sulphide onto Al evaporated Al substrates. The dependence of selectivity, α/ϵ, on thickness has been studied. The maximum selectivity was obtained for PbS thickness of 400 Å. The emissivity is found to increase with temperature. The coatings are stable up to a temperature of 240°C in air. Long term ultraviolet irradiation causes the photo‐oxidation of PbS to PbSO 4 which results in the increase of emittance and a decrease in absorptance. When cycled between 0°C and 200°C, the coatings do not show any signs of degradation.