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Photothermal performance of selective black nickel coatings
Author(s) -
Gogna P. K.,
Chopra K. L.,
Mullick S. C.
Publication year - 1980
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.4440040403
Subject(s) - thermal emittance , selective surface , materials science , nickel , thermal , photothermal therapy , electroplating , absorptance , optics , composite material , optoelectronics , metallurgy , meteorology , nanotechnology , beam (structure) , physics , layer (electronics) , reflectivity
Selective black nickel coatings with solar absorptance (αs = 0·94) and thermal emittance (ε = 0.08) at 100°C have been developed on galvanized steel using electroplating and chemical conversion techniques. Thermal performance tests have been conducted on selective and non‐selective collectors with single glass cover. A suitable collector test assembly has been constructed for thermal performance study. Measurements have been made under clear sky conditions over a wide range of inlet temperatures. For comparison, measurements have been carried out on an identical collector painted black. Thermal efficiencies of about 28 per cent at an operating water temperature =100°C ambient temperature =35°C and incident insolation =1000 W/m2 have been obtained.