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West-facing glazing is the most difficult to shade because the afternoon sun is

  • A.high in the sky for most of the afternoon
  • B.diffused by the atmosphere at that hour
  • C.of a lower intensity than the morning sun
  • D.low in the sky and shines directly into the opening

Answer: D

A horizontal overhang cannot intercept a low sun, so vertical fins or an external screen is needed, and the gain coincides with the hottest part of the day. Reducing the west glazing is usually cheaper than shading it.

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