Hot-water system of heat pump

Abstract

The invention discloses a hot-water system of a heat pump. The hot-water system comprises a compressor, a four-way valve, an outdoor heat exchanger, a throttling device and a water tank, and further comprises a bushing heat exchanger and a coil heat exchanger, wherein the bushing heat exchanger and the coil heat exchanger are arranged in parallel; in the heating operation of the system, refrigerant flowing out from the compressor flows through the four-way valve to enter the bushing heat exchanger for condensation heat release; after the pressure of the refrigerant is reduced by the throttling device, the refrigerant is fed in the outdoor heat exchanger for evaporation heat absorption; and finally, the refrigerant enters the compressor by the four-way valve; in the defrosting operation of the system, the refrigerant flowing out from the compressor enters the outdoor heat exchanger by the four-way valve for condensation heat release; after the pressure of the refrigerant is reduced by the throttling device, the refrigerant is fed in the coil heat exchanger for evaporation heat absorption; and finally, the refrigerant is fed in the compressor through the four-way valve. The system directly supplies heat to heated water through the bushing heat exchanger in the heating process, so that the purpose of quick water heating can be realized; the heat is supplied through the coil heat exchanger in the defrosting process; and the influence on the water temperature in the water tank and the use comfort of users from the heat absorption of the coil heat exchanger in the defrosting process is little.

Description

technical field [0001] The invention relates to the technical field of air energy water heaters, in particular to a heat pump hot water system. Background technique [0002] In order to pursue high-efficiency and rapid defrosting effect, at present, air energy heat pump water heaters mostly use four-way valve reversing defrosting; especially for circulating or direct heating air energy heat pump water heaters, since the condenser is mostly replaced by casing, shell tube or plate Waiting for the heat exchanger, when the four-way valve is reversed to defrost, the condenser is transformed into an evaporator to provide heat for the refrigerant, and the heat source is hot water. [0003] During the defrosting process of the heat pump outdoor heat exchanger, a part of cold water is bound to be produced when the circulating or direct heating air heat pump water heater adopts reversing defrosting, especially for direct heating units, this part of cold water is bound to have a negati...

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Problems solved by technology

[0005] The air heat energy heat pump water heater defrosting device provided by the above-mentioned patent application has a simple structure, low cost, and high defrosting efficiency, and can not affect the heating water during the defrosting process, thereby not affecting the normal use of the heat pump water heater. , to overcome the problem that the temperature of the hot water decreases due to the heat absorbed by the heat exchanger in the water tank during the defrosting process of the transmission water heater, but the defrosting process uses the waste heat of the refrigerant after heat exchange in the water side heat exchanger, although there is Certain defrosting effect, but the heat is low, the defrosting effect is poor, and the time required for defrosting is longer

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