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A Trombe wall is a passive heating device consisting of

  • A.a massive wall behind glazing on the sunward side
  • B.a water-filled roof pond with movable insulation
  • C.a buried duct bringing air in at ground temperature
  • D.a lightweight wall with reflective insulation

Answer: A

The sun heats the mass through the glass and the wall releases the heat into the room over the following hours, giving a time lag that suits an evening occupancy. Vents at top and bottom let it work by convection as well as conduction.

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