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Discussion

Widening the comfort band from a fixed set point saves energy because

  • A.the plant runs for fewer hours and at lower load
  • B.the occupants generate less metabolic heat
  • C.the building's thermal mass increases
  • D.the ventilation rate required falls

Answer: A

Every degree of set point relaxation in summer cuts the cooling hours and the load appreciably, and in a naturally ventilated building it may remove the plant's operation altogether for weeks. It costs nothing but the acceptance.

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