Patent ID: 7841201

Claim:
A heat pump comprising: an evaporator for evaporating water as a working liquid to generate a working vapor, the evaporator comprising an evaporation chamber and being adapted to generate an evaporation pressure of less than 20 hPa within the evaporation chamber, so that the water will evaporate at temperatures below 18° C., the evaporator comprising a feed line configured for feeding the working liquid to the evaporation chamber an expander expanding to at least three times a diameter of the feed line; a reception apparatus adapted to receive any working liquid fed by the feed line to the expander and overflowing over an edge of the expander; and a drain adapted to carry off the overflowing working liquid; a dynamic-type compressor coupled to the evaporator for compressing the working vapor, the dynamic type compressor being adapted to compress the working vapor to a working pressure of more than 5 hPa above the evaporation pressure; and a liquefier for liquefying the compressed working vapor, the liquefier being adapted to output a heat which has been acquired during the liquefaction to a heating system.