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Study on emissivity and absorptivity effect of black nickel coated copper used in solar receiver tube material

ABSTRACT Experimental investigation about emissivity (ε) and absorptivity (α) effect of black nickel coated copper used in selective surface of solar receiver tube material with the temperature difference such as 50°C, 100°C, 150°C, 200°C, 250°C, 300°C, 350°C, 400°C, 450°C and 500°C. The duration of exposure also considered for this study with 10 days gap (10 days, 20 days, 30 days, 40 days and 50 days). These conditions were followed to surface without coating and with coating. The corresponding properties were measured and mentioned experimentally as well theoretically. Transmissibility also considered in the time of study for identify the radiation characteristics.