Ultralow circumstance temperature solar energy-air source heat pump unit externally connected with sustainable heat source

Abstract

The invention discloses an ultralow circumstance temperature solar energy-air source heat pump unit externally connected with a sustainable heat source. The ultralow circumstance temperature solar energy-air source heat pump unit comprises a quasi-double-stage (double-stage) compressor, a four-way reversing valve, an indoor heat exchanger, a main road economizer, a main road electronic expansion valve, an outdoor heat exchanger, a gas-liquid separator, a side road electronic expansion valve, a water cooling evaporator, a low-temperature solar heat collector, a water pump, a first one-way valve, a capillary pipe, a second one-way valve, a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve, a sixth solenoid valve, a seventhsolenoid valve, a main loop (heating/cooling operation), a defrosting loop, a gas makeup loop and a sustainable heat source loop. On the one hand, under the gas makeup conditions, the ultralow circumstance temperature solar energy-air source heat pump unit can heat refrigerating fluid in the gas makeup loop through hot water produced by the solar heat collector to gasify the refrigerating fluid; and on the other hand, under the defrosting conditions, the four-way reversing valve of the unit does not conduct reversing, and the unit conducts defrosting through hot water generated by solar energyduring indoor continuous heat supply.

Description

technical field [0001] The invention relates to a quasi-two-stage (two-stage) compressed air source heat pump system with intermediate air supply, in particular to an ultra-low ambient temperature solar-air source heat pump unit with an external sustainable heat source for intermediate air supply. Background technique [0002] The existing intermediate air supply type quasi-two-stage (two-stage) compressed air source heat pump system mainly has two forms of intermediate air supply: the subcooling type with an economizer and the flash type with a flasher. The refrigerant used for air supply in the former is The steam is further heated by the high-temperature / pressure liquid refrigerant at the outlet of the condenser, and the latter is generated by the gas-liquid phase separation after the first stage throttling. The heat consumed by these two forms of supplementary air comes from the system itself. In addition, the defrosting forms of the quasi-two-stage (two-stage) compress...

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Problems solved by technology

In addition, the defrosting forms of the quasi-two-stage (two-stage) compressed air source heat pump system with intermediate air supply mostly adopt reverse cycle defrosting and hot gas bypass defrosting. The demanded heat, resulting in a decline in the coefficient of performance of the heating season, weakened the economy of air source heat pump heating in the middle air supply

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