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The time lag of a wall is the delay between

  • A.sunrise and the first solar gain through the glazing
  • B.switching the plant on and the space eventually reaching its set point
  • C.the outdoor and indoor peak humidity
  • D.the peak outdoor temperature and the peak indoor surface temperature

Answer: D

A heavy wall may delay the peak by eight or ten hours, so the heat arrives after the occupants have left and can be discharged overnight. Selecting the mass to place the peak outside occupied hours is the object of the calculation.

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