Calculate the overall loss coefficient for a flat-plate solar collector located in Madison and sloped toward...

 

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Calculate the overall loss coefficient for a flat-plate solar collector located in Madison and sloped toward the equator with a slope equal to the latitude. Assume a single glass cover 25 mm above the absorber plate, a wind speed of 6.5 m/s, an absorber long-wave emittance of 0.11, and 70 mm of rock wool back insulation having a conductivity of 0.034 W/m °C. The mean plate temperature is 100°C, and the ambient temperature is 25°C. Neglect edge effects and absorption of solar radiation by the glass. The collectors are mounted flush on the surface of a house having a volume of 300 m³. The time is noon and Tdp = 20°C. Calculate the overall loss coefficient for a flat-plate solar collector located in Madison and sloped toward the equator with a slope equal to the latitude. Assume a single glass cover 25 mm above the absorber plate, a wind speed of 6.5 m/s, an absorber long-wave emittance of 0.11, and 70 mm of rock wool back insulation having a conductivity of 0.034 W/m °C. The mean plate temperature is 100°C, and the ambient temperature is 25°C. Neglect edge effects and absorption of solar radiation by the glass. The collectors are mounted flush on the surface of a house having a volume of 300 m³. The time is noon and Tdp = 20°C.