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For what purpose are Gas heating collectors used?

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For what purpose are Gas heating collectors used?

(a) To trap solar radiance

(b) To act as a medium to help in conversion of sunlight to electrical energy

(c) Employed as solar air heaters

(d) They act as alternate panels in case of failure

I had been asked this question during an interview.

My enquiry is from Flat Plate Collectors topic in division Solar Energy of Energy Engineering

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Right answer is (c) Employed as solar air heaters

Best explanation: Air or Gas heating collectors are employed as solar air heaters. Solar air heater is a type of system driving outdoor air through a sealed, sun heated collector mounted on an exterior wall or roof, returning the warmed air back to the living space.

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