Liersch, G.F.G.F.LierschWittwer, V.V.Wittwer2022-03-082022-03-081996https://publica.fraunhofer.de/handle/publica/303552The invention relates to a device for the passive solar heating of buildings, and consists of a transparent heat insulator (4), absorber (5), weather protection (3) and a housing (7), whereby the device is formed as a closed module and the absorber (5) is in contact with the heat insulator (4), between the absorber and the wall to be heated there is an air gap (8), and two variable air inlet and outlet openings (1) are provided in the housing (7).de608621697Vorrichtung zur passiven solaren Beheizung von GebaeudenDevice for the passive solar heating of buildingspatent1993-4317858