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Direct gain passive heating admits sunlight

  • A.onto an external wall that then conducts inward
  • B.into the occupied space, where mass absorbs it
  • C.into a separate collector isolated from the space
  • D.into a buried duct beneath the building

Answer: B

Correct answer: into the occupied space, where mass absorbs it

Direct gain is the simplest passive arrangement: south glazing admits the sun into the room itself, and exposed floor or wall mass absorbs it and releases it after dark. The cost of that simplicity is glare and a swing in temperature, which indirect systems such as a Trombe wall moderate at the expense of some efficiency.

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