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 radiator operable with a flow of air for cooling a quantity of water and formed as zig-zag walls, each of which comprises air ducts of predetermined ratio of flow length to hydraulic diameter.

Abstract: A device comprising at least three reciprocable piston-shaped bodies, each of which is provided with a drive rod which cooperates, via a drive rod head accommodating sliding bodies, with a plate which is mounted on a rotatable shaft and which can be tilted about a tilting axis which is transverse to the center line of the shaft. The means for tilting the plate are formed by piston-shaped bodies which can rotate with the shaft and which can be adjusted in the direction of the shaft, the first of the said bodies being coupled to the plate on the one side of the tilting axis, the other body being coupled to the plate on the other side of the tilting axis. Each of the said piston-shaped bodies bounds a space whereto pressurized liquid can be applied, the masses of the said piston-shaped bodies also serving for balancing the unbalancing forces occurring during operation.

Abstract: A hot-gas reciprocating engine comprising at least three piston-like bodies which each separate a hot space and a cold space in the relevant cylinder. Each of the hot spaces communicates, via a regenerator, with one of the cold spaces in another cylinder. Each of the piston-like bodies cooperates, by way of a drive rod, with a plate which is mounted on a rotatable shaft in such a manner that it cannot rotate with respect to this shaft, but can be tilted about a tilting shaft extending transversely of the first-mentioned shaft. Each of the cold spaces communicates, by way of a duct incorporating a control valve, with a cold space in another cylinder. Means for operating these valves are so constructed that, when the valves are opened, these means operate the means for tilting the plate, so that the plate assumes a more inclined position with respect to the shaft. The means for tilting the plate can be operated independently of the means for operating the valves.

Abstract: A hot-gas reciprocating engine comprising at least three pistons which each separate a space of lower temperature and a space of higher temperature. Each space of lower temperature is each time connected, via a regenerator and a heat exchanger which is in heat-exchanging contact with a reservoir containing heat-accummulating material, to a space of higher temperature having volume variations which lead in phase as well as to a space of higher temperature having volume variations which lag in phase. The said connections include valves which are operated by means for selectively releasing one of the two connections, each of the pistons co-operating, by way of a drive rod, with a tiltable plate which is mounted on a rotatable shaft.