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Homework No 4 2009

Homework No 4 2009 - Homework No 4 EML 6417 Due October 5...

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Homework No. 4 EML 6417 Due October 5, 2009 Develop a spreadsheet calculation to evaluate the Hotell-Whillier equation in your book for the instantaneous efficiency of a flat plate collector. Consider a single glass FPC having the following specifications: Plate to cover spacing: 25 mm Plate emittance = plate absorptance = 0.95 Glass emittance = 0.88 Glass transmissivity = 0.96 Glass surface reflectivity = 0.04 Ambient air temperature = 10 deg C Sky temperature = 10 deg C Glass temperature = 50 deg C Mean plate temperature = 95 deg C Wind heat transfer coefficient = 15 W/m2 deg C Convective heat transfer coefficient between plate and glass cover = 5 W/m2 deg C Collector tilt = 45deg Tube spacing = 150 mm Tube diameter (nominal) = 10 mm Plate thickness = 0.5mm Plate thermal conductivity (copper) = 385 W/mdegC Heat transfer coefficient inside tubes = 300 W/m2 deg C Bond resistance = o Water mass flow rate = 0.03kg/s (approximately 0.47 gpm) Inlet fluid temperature = 20 deg C Collector panel area = 2 m2 Collector length = 1.98 m Collector width = 0.994 m Assume incident solar irradiation is 400 W/m2 on a 45 deg tilted plane.

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