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The stack effect is strongest when

  • A.the outdoor air is warmer than the indoor air
  • B.the building is single-storey and well sealed
  • C.the wind is blowing strongly and steadily across the openings on both sides
  • D.the indoor to outdoor temperature difference and the height are both large

Answer: D

Correct answer: the indoor to outdoor temperature difference and the height are both large

The driving pressure is proportional to both, so the effect is strongest on a cold day in a tall building. That is also its limitation as a cooling strategy: it works least well in hot weather, when the temperature difference is small and the cooling is most wanted.

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