Szukana fraza: [Abstract = "The refrigerant transfers heat from the lower heat source to the upper heat source. The paper discusses types of heat pumps in terms of the use of the lower heat source. A technical and economic analysis was carried out on the basis of two types of heat pump\: air\-to\-water and ground\-to\-water A comparative analysis of the results obtained results will allow a real assessment of the system\?s functioning."]

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