Quasi-two-stage compression ultralow temperature air source heat pump water heater with economizer

Abstract

The invention discloses a quasi-two-stage compression ultralow temperature air source heat pump water heater with an economizer, which mainly comprises a gas-supply enthalpy-rise compressor, an air-cooling evaporator, a water side heat exchanger, a gas-liquid separator, an economizer, a four-way valve, an electronic expansion valve, a drying and filtering device, a liquid accumulator, an electromagnetic valve, a thermal expansion valve and a one-way valve. The invention is characterized by adopting a quasi-two-stage compression technology, optimizing the structure of the evaporator, widening spaces between fins of the evaporator and using the reverse defrosting technology. Proved by system property test experiments and engineering practices, the quasi-two-stage compression ultralow temperature air source heat pump water heater with the economizer can improve energy efficiency ratio by 10% at the ambient temperature of 0 DEG C, by 15% at the ambient temperature of -5 DEG C and by about 30% at the ambient temperature of -10 DEG C and can still work normally to supply hot water even in ultralower ambient temperature of -15 DEG C; and in a frosting temperature range from 2 DEG C to -2 DEG C, the quasi-two-stage compression ultralow temperature air source heat pump water heater with the economizer can defrost quickly, evenly and thoroughly, thereby effectively solving the problem of frosting in winter in humid and cold area in the south of china.

Description

technical field [0001] The invention relates to energy-saving heating equipment, in particular to a quasi-two-stage compression ultra-low temperature air source heat pump water heater with an economizer. Background technique [0002] The air source heat pump water heater uses air as the heat source and refrigerant as the refrigerant. It is mainly composed of a compressor, a condenser, an expansion valve, a four-way valve, an air-cooled evaporator, and a gas-liquid separator. The evaporator sucks low-temperature and low-pressure gaseous refrigerant, compresses it into high-temperature and high-pressure gaseous refrigerant by doing work, and then enters the condenser for heat exchange with water and is condensed into a low-temperature liquid refrigerant. The water absorbs the released heat and the temperature continues to rise . After the condensed high-pressure and low-temperature liquid is throttled and depressurized by the expansion valve, it absorbs the heat of the surrou...

AI Technical Summary

Problems solved by technology

When the outdoor temperature is very low, the heating capacity of the system will be too small to meet the winter heating needs of these areas, and even the system cannot operate normally

[0005] (2) As the outdoor ambient temperature decreases, the pressure ratio of the compressor will increase, which will lead to a sharp drop in the heating COP of the unit, and the heating effect is not ideal

[0006] (3) The exhaust temperature of the compressor continues to rise, and the power consumption of the compressor increases, which affects the service life of the compressor

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