| Summary: | The work relates to the problems of using heat pumps in district heating systems. The aim of the study is to increase the energy economic efficiency of combined heat supply systems with heat pumps using natural refrigerants. This goal is achieved by developing a scheme of the system in which part of the building is heated centrally from the CHP, and the other part is from a heat pump installed in the building, and heat pump which receives low potential heat from the return network water leaving the part of the building, - centralized, and from outside air. The most sig-nificant results of the work are the developed scheme of a carbon dioxide heat pump, which combines both the possibilities of working in a quantitative heat supply system and when pre-paring hot water for buildings in a non-heating period. The significance of the obtained results lies in the fact that the proposed technical solution allows to reduce significantly fuel consump-tion for thermal power plants and the costs of consumers when they pay for consumed energy. Heat pump circuits have also been established for the quantitative law of regulating the opera-tion mode of the heat supply system. With the proposed scheme of operation, the heat pump for domestic hot water works only in the non-heating period, and domestic hot water is provided during the heating period from the CHP.
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