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_______ is a glazing which limits the radiation and convection heat losses.

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_______ is a  glazing which limits the radiation and convection heat losses.

(a) Absorber plate

(b) Selective surface

(c) Insulation

(d) Transparent cover

I had been asked this question in examination.

This intriguing question comes from Flat Plate Collectors topic in division Solar Energy of Energy Engineering

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The correct choice is (d) Transparent cover

Explanation: A transparent cover is glazing which limits the radiation and heat convection losses. It includes one or more sheets of glass or radiation transmitting plastic film or sheet. The glass itself is always a single pane adding to adding the second reduces the collector efficiency.

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