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A low-emissivity coating on glazing works by

  • A.reducing the air leakage round the frame
  • B.reflecting long wave infrared radiation
  • C.absorbing the whole of the incident solar spectrum
  • D.increasing the glass's thermal conductivity

Answer: B

It lets visible light through while turning back the long wave radiation, so a heated building keeps its warmth and a cooled one rejects the re-radiated heat. Which side of the pane it is placed on depends on whether heating or cooling dominates.

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