A technique for controlling air flow through modified Trombe walls.

This paper describes an experimental investigation into the operation of a modified Trombe wall. The construction has been altered to include a layer of insulation material; two alternative positions for this insulation layer have been considered and tested. Air flow from the top of the Trombe wall has also been enhanced by the inclusion of a low power axial flow fan which was controlled to function dependent on measured temperature in the wall cavity. The construction with exposed concrete facing into the air cavity has a slower response than that with exposed insulation facing the cavity. The concrete option also produces higher outlet temperatures, though the fan was found to operate for longer periods with the insulation option. The controller used could be developed for employment in more sophisticated control strategies.