Abstract
The paper deals with the urgency of use and finding of new refrigerant mixtures that are, in particular, applied for heat pumps. To obtain high conversion efficiency an optimal composition of the CO2 /R32/R134a refrigerant mixture as regards thermodynamic and environmental characteristics was selected. Its main advantages as well as disadvantages were shown. Also the cycle of the heat pump was improved by a heat exchange apparatus adding; the last used the heat of rejected water after a consumer. The modeling of cycles using special program packages was carried out. The major graphic dependences and cycles parameters are presented. The improvements listed allowed obtaining the heat pumpwater heater conversion efficiency equal to 15,75. The main conditions to obtain such a high conversion efficiency of the plant are described.