Answer to Question #7267 in Molecular Physics | Thermodynamics for Shahriar

Question

Estimate the energy collection and efficiency of a module of a two-cover water heating flat-plate collector operating at a latitude of 30° in a space heating process. The date is March 11 and the hour is 1500 to 1600. Assume Ts=Ta; (τα)e = 1.02 τα; all incident solar is beam radiation. Ignore dust and shading and ignore edge losses. Take ρg= 0.6. The design parameters of the module are as follows:

0.75 m wide, 5 in long
Two glass covers, KL = 0.0125 per cover
Metal plate 1.0 mm thick; k = 50 W/m ºC
Tubes are 10 mm diameter on 100-mm centers
α = 0.95, independent of incident angle
Back insulation 80 mm thick; k = 0.048 W/m ºC
Water flow rate 0.03 kg/s
Heat transfer coefficient inside risers 300 W/m2 ºC
Slope from horizontal = 50°
Cover spacing = 25 mm
Plate emittance εp = 0.95
For this hour, the operating conditions are as follows:
Solar radiation for the hour on a horizontal surface 1.40 MJ/m2
Ambient temperature 2°C
Wind heat transfer coefficient 10 W/m2 °C

Answer 1

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