| 摘要 |
PURPOSE: A two-stage compression type heat pump system for supplying hot water is provided to efficiently raise the temperature of the water supplied to the building by forming a plurality of compression systems into multi-stage. CONSTITUTION: A two-stage compression type heat pump system for supplying hot water comprises a low-stage compression system, a high-stage compression system, and a flow line(90). The low-stage compression system is composed of a low-stage compressor(10a), a low-stage condenser(20a), a low-stage receiver tank(30a), a low-stage expansion valve(40a), a low-stage evaporator(50a), a low-stage ventilation fan(60a), a low-stage accumulator(70a), a first four way valve(80), a low-stage check valve(81). The low-stage compressor compresses a first refrigerant(A) at high pressure and temperature. The first four way valve connects the low-stage compressor, the low-stage condenser, the low-stage evaporator and the low-stage accumulator and switches the flow passage direction of the first refrigerant. The high-stage compression system is composed of a high-stage compressor(10b), a high-stage condenser(20b), a high-stage receiver tank(30b), a high-stage expansion valve(40b), a high-stage evaporator(50b), a high-stage ventilation fan(60b), a high-stage accumulator(70b), a second four way valve(82), and a high-stage check valve(83). The high-stage compressor compresses the second refrigerant(B) at high pressure and temperature. Water(I) is flowed into the low-stage condenser through the flow line and then is provided to a building through the high-stage condenser.
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