Abstract: An absorption heat pump comprising a generator which is provided with a condensation pipe (59) comprising a lower generating section (79) and an adjoining upper rectifying section (81). The upper section (81) is filled with a thermally insulating gas (87) which separates the generating section (79) from the rectifying section (81). Thus, a simple construction is obtained, in which the rectifier is integrated in the generator.

Abstract: An absorption heat pump comprising a heat-mass-exchanger (57) which is arranged in an absorber (3) and has a metal pipe (77) to which a metal fin is secured. The metal fin consists of a number of interconnected lamellae (81) which are helically wound around the pipe (77), while adjacent lamellae (81) of successive turns overlap each other in part, viewed in the circumferential direction of the pipe (77). The finned pipe (77) yields a comparatively strong heat-mass transfer in the absorber (3).

Abstract: A method of operating a bimodal heat pump is provided, such heat pump operating in a first mode as an absorption heat pump and in a second mode as a device for indirectly heating a heat-transport medium.

Abstract: The invention relates to a coffee maker comprising a water reservoir (1), a filter device (2) and a flow heater (3) for heating water from the water reservoir for delivery to the filter device. A problem associated with coffee makers is the deposit of scale in the flow heater. It is proposed to provide a coffee maker with means (13, 14) for adding a small amount of coffee extract to the water before it enters the flow heater (3). Coffee extract naturally contains phosphoric-acid-like compounds which inhibit the crystal growth of metal salts in the water. Preferably, coffee extract is fed continuously from the filter device (2) to the water reservoir (1).

Abstract: There is provided a method of operating a bimodal heat pump which in a first mode operates as an absorption heat pump and in a second mode operates as an evaporation-condensation device at a comparatively low ambient temperature. When switching from the first mode to the second mode, the evaporator and the absorber are uncoupled from the generator and the condenser. The generator and the condenser are operated in the second mode as an evaporation-condensation device, an extra quantity of working medium being present. The passage from the condenser to the evaporator is positioned at a level that provides the extra quantity of the working medium when starting the second mode.

Abstract: A method of operating a bimodal heat pump which in a first mode operates as an absorption heat pump and in a second mode operates as an evaporation-condensation device at a comparatively low ambient temperature. When switching from the first mode to the second mode, evaporator 15 and absorber 23 are uncoupled from generator 1 and condensor 7. The generator 1 and condensor 7 are operated in the second mode as an evaporation-condensation device, an extra quantity of working medium present in the condensor 7 being provided in the system. The heat pump comprises an overflow to the evaporator 15 the level 83 of which is a measure of an extra quantity of the working medium and has a closable transport pipe to the generator 1 for supplying extra working medium to the generator 1 when starting the second mode.The heat pump is meant in particular for heating spaces and presents the possibility of choosings from various working media and solvents having different decomposition temperatures.

Abstract: A heat pipe contains a getter for gaseous impurities arranged in the vapor space and distributed between the vaporization wall and the condensation wall.