A 4-m 2 square flat-plate solar collector for domestic hot-water heating is shown schematically. Solar radiation at

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A 4-m2 square flat-plate solar collector for domestic hot-water heating is shown schematically. Solar radiation at a rate of 750 W/m2 is incident on the glass cover, which transmits 90% of the incident flux. Water flows through the tubes soldered to the backside of the absorber plate, entering with a temperature of 25°C. The glass cover has a temperature of 27°C in the steady state and radiates heat with an emissivity of 0.92 to the sky at – 50°C. In addition, the glass cover loses heat by convection to air at 20°C flowing over its surface at 20 mph.

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Principles Of Heat Transfer

ISBN: 9781305387102

8th Edition

Authors: Frank Kreith, Raj M. Manglik, Mark S. Bohn

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