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None of the following is a property of the envelope except

  • A.the efficiency of the lighting ballast
  • B.the solar heat gain coefficient of the glazing
  • C.the coefficient of performance of the chiller
  • D.the specific fan power of the air handling unit

Answer: B

Correct answer: the solar heat gain coefficient of the glazing

The envelope is the fabric separating inside from outside, so its properties are U-values, solar heat gain coefficients, air tightness and thermal mass. Lighting ballasts, chillers and air handling units are all systems within the building, and their efficiencies are addressed separately.

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