A solar panel (5m x 2m) is used for heating domestic water. The absorbing panel has...
A solar panel (5m x 2m) is used for heating domestic water. The
absorbing panel has an absorbtivity of 0.93, a top-plate symmetry
emissivity of 0.9, and a back-plate emissivity of 0.05. The
transmittance through the glass top cover is 0.85.
With a peak radiation of 700 W/m^2 the absorber temperature is 100°
C and the top-cover is 60° C. if the all the absorber heat is
transferred to the water which flows through ducts in the absorber
with negligible heat-transfer resistance, determine the water mass
flow rate (kg/s) necessary to raise the water temperature from 15°
C (inlet) to 60° C at peak radiation. State clearly any assumptions
made. Assume heat transfer coefficient as 7 W/m^2K
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