Abstract
A thick concrete wall for solar radiation heating in a building with attached greenhouse and outside insulated enclosure was studied. It was shown through a long-term study that heat flowed from the wall surface to the room in winter. The room temperature was controlled because of 2 reasons. Firstly, it was becasuse of the external thermal insulation of building enclosure. Secondly, it was bacause of the thick concrete wall and the greenhouse. The thermal environment of the room was evaluated by measuring distribution of the thermal radiant temperature.