An ultra-low ambient temperature solar-air source heat pump unit with an external sustainable heat source

Abstract

The invention discloses an ultra-low ambient temperature solar-air source heat pump unit connected with a sustainable heat source. device, main circuit electronic expansion valve, outdoor heat exchanger, gas-liquid separator, auxiliary circuit electronic expansion valve, water-cooled evaporator, low-temperature solar collector, water pump, first one-way valve, capillary tube, second one-way valve, second 1st solenoid valve, 2nd solenoid valve, 3rd solenoid valve, 4th solenoid valve, 5th solenoid valve, 6th solenoid valve, 7th solenoid valve, main loop (heating / cooling operation), defrosting loop, Supplementary air loop and sustainable heat source loop. On the one hand, the unit can use the hot water produced by the solar collector to heat the refrigerant in the air supply loop to vaporize it under the air supply working condition. On the other hand, in the defrosting condition, the four-way reversing valve of the unit does not change direction, and the hot water produced by solar energy is used for defrosting when the indoor heating is continued.

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...

AI Technical Summary

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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