Low-environment-temperature air source heat pump system with undercooling loop

Abstract

The invention belongs to the technical field of air source heat pump systems, relates to an air source heat pump refrigerating system, in particular to a low-environment-temperature air source heat pump system with an undercooling loop. The low-environment-temperature air source heat pump system comprises a main loop, an auxiliary loop, the undercooling loop and a one-way valve assembly. A first outlet of an air-supplying enthalpy-adding compressor is connected with a first port of a four-way reversing valve. A second port of the four-way reversing valve is connected with a first port of an indoor heat exchanger. A second port of the indoor heat exchanger is connected with the inlet end of the one-way valve assembly. According to the low-environment-temperature air source heat pump system, the main loop, the auxiliary loop and the undercooling loop are combined in an optimization manner, so that the circular flow of the refrigerating system in the air source heat pump low-temperature environment is increased; high-temperature refrigerant is introduced into the bottom of an outdoor heat exchanger, so that the bottom temperature of the outdoor heat exchanger is always higher than zero in the low-temperature environment, the bottom of the heat exchanger will not freeze, condensate water and defrosting water of the outdoor heat exchanger can be discharged smoothly in winter, and the phenomenon that ice layers are accumulated, a unit cannot operate normally at the cold high-humidity environment is avoided.

Description

technical field [0001] The invention relates to an air source heat pump refrigeration system, in particular to a low ambient temperature air source heat pump system with a subcooling circuit, belonging to the technical field of air source heat pump systems. Background technique [0002] At present, many areas in northern my country still use boiler Heating, boilers burning coal, and low-altitude emissions of pollutants are one of the important killers of smog and PM2.5 in the northern region. To completely control the smog in the north, eliminating small coal-fired boilers is the fundamental way out. Encouraging and supporting the development of new energy, energy-saving and environmental protection industries such as the air source heat pump industry is one of the main ways to solve the smog in the northern region. [0003] However, when air source heat pumps are extended to cold areas such as the Yellow River Basin, North China, and Northwest China (the heating design te...

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Problems solved by technology

[0003] However, when air source heat pumps are extended to cold areas such as the Yellow River Basin, North China, and Northwest China (the heating design temperature range is -5 to -20°C), they encounter problems such as serious attenuation of heating heat and low energy efficiency ratio at low ambient temperatures; The temperature is lower than zero degrees Celsius for a long time. If the defrosting water generated during the defrosting of the unit in winter cannot be discharged in time, it will cause the bottom of the outdoor heat exchanger to freeze, and the unit will not be able to operate normally due to the accumulation of ice.

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