1 December 1983 Thermal Stability and Performance of Molybdenum Black Solar Selective Absorbers.
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Abstract
Molybdenum black solar selective absorbers have been deposited on galvanized steel and zinc-plated mild steel sheet by chemical conversion process. The high solar absorptance ( 0.88 ) and low thermal emittance ( 0.20 ) have been achieved for molybdenum films deposited on galvanized steel sheet at room temperature. In this paper we discuss the stability and dependence of selective properties on elevated temperature, temperature cycling and highly humid atmosphere. It is observed that the coatings do not degrade on annealing at 250°C in air upto 800 hours constantly. The selective properties remain almost constant on thermal cycling ( 600 times at 150°C ) and 98% humidity. The heat loss factor of the molybdenum black film coated absorbing surface has been calculated from the stagnation temperature measurements. The molybdenum black film coated absorbers achieve 141° C as compared to black painted absorber temperature 124°C under identical condition.s. It is concluded that the coatings produced by chemical conversion process are of appropriate quality for applications in solar appliances.
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B. K. Gupta, A. K. Agarwal, V. P. Bhatnagar, "Thermal Stability and Performance of Molybdenum Black Solar Selective Absorbers.", Proc. SPIE 0428, Optical Materials and Process Technology for Energy Efficiency and Solar Applications, (1 December 1983); doi: 10.1117/12.936318; https://doi.org/10.1117/12.936318
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KEYWORDS
Glasses

Temperature metrology

Molybdenum

Tantalum

Zinc

Chemical reactions

Humidity

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