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External shading is preferred to internal blinds because it

  • A.improves the uniformity of the daylight
  • B.intercepts the radiation before it enters the space
  • C.reflects a larger fraction of the radiation
  • D.reduces the conduction through the glazing

Answer: B

A blind inside absorbs the energy within the conditioned volume and re-radiates it there, so the plant still has to remove it. Keeping the sun off the glass is the only measure that removes the gain rather than relocating it.

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