Abstract: A heating device comprising a plurality of heating chambers, each chamber being bounded by the heat-transmission wall of a reservoir in which a heat transport medium is present which completes an evaporation/condensation cycle. The reservoirs are connected, via a common reservoir which also contains heat transport medium, to the same common heat source.

Abstract: A heating system for supplying thermal energy to a heater of a machine such as a hot gas engine, this system using a heat-transporting medium which flows within a closed space between a heat-receiving portion to a heat-discharging portion. Thermal energy is supplied from a heat source through a wall in the heat-receiving portion with the transporting medium changing from the liquid phase to the-vapor phase, and the absorbed thermal energy is transferred to the heater in the heat-discharging portion by changing from the vapor phase into the liquid phase. The wall parts of the heat-receiving portion, through which thermal energy can be supplied from the heat source to the transporting medium, comprise on their surface contacting this medium of a layer of a porous material having a capillary structure whereby liquid-phase medium is distributed on said walls.

Abstract: A cooling system for a combustion engine with a radiator wherein a plurality of cooling medium pipes are arranged in one plane, the pipes being connected by strips of gauzes, with air ducts between the strips or in the gauzes having a hydraulic diameter (d.sub.h) of less than 2 mm, the length (L) of said ducts being less than 25 mm, and L/d.sub.h <25. The radiator is preceded by a dirt collector consisting of a thin zigzag-folded air-transmitting layer with ducts having a hydraulic diameter of less than 2 mm.

Abstract: Container for storing and transporting a liquefied gas provided with an auxiliary container which contains a material by which gas produced by evaporation of the liquid is sorbed at a temperature higher than the temperature of the liquid.

Abstract: A heating device, comprising a tubular body whose inner wall bounds a heating chamber for objects. Between the inner wall and the outer wall of this body a plurality of ducts is provided which are situated in a ring-shape about the heating chamber and which extend parallel to the tube axis. These ducts are separated from each other by rigid partitions. Each duct contains evaporable heat transport medium.

Abstract: A heating device comprising a plurality of heating chambers, each chamber being bounded by the heat-transmission wall of a reservoir in which a heat-transmission wall of a reservoir in which a heat transport medium is present which completes an evaporation/condensation cycle. The reservoirs are connected, via a common reservoir which also contains heat transport medium, to the same common heat source.

Abstract: A hot-gas engine including a heater and a source of heat in combination with a switching device for conveying heat from the heat source to heater, the device including a pair of spaced heat pipes with third intermediate heat pipe and means for introducing inert gas into said third heat pipe and removing said gas to vary the vaporization point therein and the rate of heat transfer therethrough.

Abstract: A heating device formed as a double-wall tubular heat pipe with a closed annular space between outer and inner walls containing a vaporizable liquid heat-transporting medium, and a cylindrical bore defined within said inner tube as the heating space for objects to be heated, said annular space having end walls closing its ends, and means for transmitting heat through one of said end walls into said space.