Abstract: One of two axially spaced annular heat exchangers, interconnected in a closed circuit traversed by a fluidic heat carrier, serves to preheat a flow of ambient air downstream of a compressor which impels that flow toward a combustion chamber where an air-fuel mixture is ignited to drive a turbine coupled with the compressor. The other heat exchanger, which extends radially beyond the first-mentioned heat exchanger to create a thermosiphon effect for the circulation of the carrier, abstracts residual heat from the expanding gas flow downstream of the turbine. In one embodiment, the compressor and the turbine are interconnected by a central shaft surrounded by a coaxial tubular member which carries the two heat exchangers; in another embodiment this relationship is reversed.

Abstract: A mechanically-driven hermetically sealed compressor for air-conditioning devices where the compressor is driven by a magnetic torque transmission arrangement which has a pole ring disposed outside the hermetically sealed compressor housing and one inside the housing. The compressor housing is, in the region of a gap between the pole rings, constructed in the form of a sealing separating wall of magnetically pervious material.

Abstract: An independently heated or cooled room is linked with an environment of different temperature through a fluid-circulation system including a closed path traversed by a heat-carrier medium. The medium travels between two heat exchangers, respectively located in the warmer and in the colder air, under a pressure differential low enough to maintain a coherent flow at substantially uniform speed in one or more pairs of channels extending between the two heat exchangers.

Abstract: In a device for reducing the temperature variation in buildings having optically transparent walls and means which permit control of the transmission, absorption and/or reflection of heat said walls possess spaces containing crystalline substances the melting temperature of which is nearer to the mean inside temperature than to the outside temperature.

Abstract: A driving device for accessory units in motor cars, e.g. an air conditioning appliance, which comprises an expansion engine which is located in the induction pipe of the internal combustion engine. The expansion engine is powered by flow of air in the induction pipe and the expansion engine serves as a throttling device for the induction pipe.

Abstract: A heat pipe comprising a hermetically sealed hollow body which is filled with a saturated vapor of and a small amount of the condensate of a heat carrying fluid. The heat pipe communicates with the inside of an auxiliary body which also may contain a small amount of the condensate and vapor and which has associated therewith heat sink and heat source means by which the amount of vapor in the auxiliary body and in the hollow body may be regulated to control heat flow in the heat pipe.

Abstract: Water for the lubrication of a bearing is obtained from a heat sink in the vicinity of the bearing. The temperature of the heat sink is below the dew-point of the surrounding air.