Electrical Engineering · Renewable Energy Systems

In a flat-plate solar thermal collector, what is the primary purpose of applying a spectrally selective coating to the absorber plate?

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1To reflect incoming infrared radiation back to the atmosphere
2To maximize solar radiation absorption while minimizing infrared thermal re-radiation✓
3To increase the overall electrical conductivity of the absorber metal
4To increase convective heat transfer losses to the glass cover

Correct answer

To maximize solar radiation absorption while minimizing infrared thermal re-radiation

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