Low temperature heat-pump water heater capable of cascade heating multimode coupling layered water discharge

Abstract

The invention discloses a low temperature heat-pump water heater capable of cascade heating multimode coupling layered water discharge. The low temperature heat-pump water heater comprises an evaporator, a first compressor, a first stop valve, a second stop valve, a middle heat exchanger, a first expansion valve, a second compressor, a first condenser, a second condenser, a second expansion valve,a water pump, a third stop valve, a fourth stop valve, a fifth stop valve, a sixth stop valve, a seventh stop valve, an eighth stop valve, a ninth stop valve, a tenth stop valve, a flow regulating valve, a water tank, a first water mixing valve, a second water mixing valve, a third water mixing valve and an eleventh stop valve. Two types of coupling heat pump circulation are adopted to independently heat a plurality of different temperature stratification areas in the water tank through switching of multiple modes; and the manner that different temperature stratification areas are independently heated under different coupling modes through switching of different stop valves is adopted. The low temperature heat-pump water heater disclosed by the invention is higher in operating stability and larger in working range.

Description

technical field

[0001] The heat pump field of the present invention relates to a heat pump water heater. Background technique

[0002] With the gradual recognition of the market and the support of national policies, air source heat pump water heaters have been widely promoted, and users pay special attention to water comfort and energy saving. Existing heat pump water heaters can only heat water to a very high temperature and store it in the water tank. When users use hot water at a lower temperature, they can only use it after mixing hot water with high temperature from the water tank and mixing it with cold water. This process wastes the available energy in the hot water As a result, a large entropy production is generated, which reduces the utilization rate of energy, and has a single temperature of hot water, which cannot quickly meet the needs of users for different water temperatures; and when the heat pump system detects that the water temperature drops, it will aut...

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