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How is heat loss over come in liquid plate collectors?

(a) By insulation

(b) By casing

(c) By the transparent cover

(d) From provided tubes

This question was addressed to me by my college director while I was bunking the class.

This question is from Flat Plate Collectors in portion Solar Energy of Energy Engineering

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Correct answer is (a) By insulation

To elaborate: Heat is transferred from the absorber plate to a point of use by the circulating fluid via water across the solar heated surface. The heat loss from the surface is prevented by placing thermal insulation of 5 to 10cm thickness behind the absorber plate.

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