HEATING WATER-HEATING CYCLE AND COOLING-HEATING WATER-HEATING CYCLE

PURPOSE:To use one heating cycle both as a heat source for space heating and as a heat source for hot water supply simultaneously, the two purposes differing in the temperature level required by using part of the working medium pressurized by a main compressor as the heat source of heat exchange for medium hot-water heating on condensation by a third heat exchanger and the remaining part of the working medium as the heat source of heat exchange for high-temperature heating by condensation after additional pressurization. CONSTITUTION:Tow cyclic heat pumps involving simultaneous operation of a main compressor 1 and an auxiliary compressor 2 are set up, channeling working medium through a circuit from the main compressor 1 third heat exchanger 6 second expansion valves 7 second heat exchanger 5 and back to the main compressor 1 and also through a circuit from the main compressor 1 auxiliary compressor 2 first heat exchanger 3 first expansion valve 4 second expansion valve second heat exchanger 5 and back to the main compressor 1. While part of the working medium pressurized by the main compressor 1 is utilized as a heat source for space heating on condensation by the third heat exchanger 6, the remaining part is pressurized additionally by the auxiliary compressor 2 so as to be turned into a gas, which has a higher pressure and higher temperature than the working medium channeled through the third heat exchanger 6, and utilized as a heat source for hot water supply on condensation by the first heat exchanger 3.