Utilize heat storage to balance the ultra-low ambient temperature air source heat pump unit with daily poor outdoor temperature

Abstract

The invention discloses an ultra-low ambient temperature air source heat pump unit that uses heat storage to balance the daily difference in outdoor temperature. The unit includes a quasi-two-stage (two-stage) compressor, an indoor heat exchanger, an economizer, and a main electronic expansion valve. , Outdoor heat exchanger, first auxiliary electronic expansion valve, second auxiliary electronic expansion valve, energy storage water tank, first solenoid valve, second solenoid valve, circulating water pump, four-way reversing valve, gas-liquid separator. During the day, at noon when the outdoor temperature is not very low, the unit has excess heating heat, which is stored in the energy storage water tank; when the outdoor temperature is very low at night, the unit uses heat storage to heat the gasification compressor to replenish air, and the unit uses external The heat absorbed is equivalent to the sum of the heat absorbed by the outdoor heat exchanger from the environment and the heat absorbed by the supplementary air from the hot water storage. When the compressor is in the same working state, the heating capacity of the unit can be increased by 32% or even higher, meeting the The heating requirements of the unit in an ultra-low temperature environment, so as to balance the daily difference in outdoor temperature.

Description

technical field [0001] The invention relates to an air-source heat pump unit, in particular to a quasi-two-stage (two-stage) compressed air-source heat pump unit that utilizes heat storage to heat a gasification compressor to supplement air and balance daily poor outdoor temperatures in an ultra-low temperature environment. Background technique [0002] The quasi-two-stage (two-stage) compressed air source heat pump with intermediate supplementary air has the problem of insufficient heating capacity when the outdoor temperature is extremely low. If a unit model with a larger heating capacity is selected, although it can meet the heating demand of the room in an ultra-low temperature environment, the cost of purchasing an air source heat pump will increase; When the temperature is high, the unit has to run at a low speed, so that the energy efficiency of the unit is relatively low, which will lead to a decrease in the seasonal performance coefficient of the unit. Contents o...

AI Technical Summary

Problems solved by technology

If a unit model with a larger heating capacity is selected, although it can meet the heating demand of the room in an ultra-low temperature environment, the cost of purchasing an air source heat pump will increase; When the temperature is high, the unit has to run at a low speed, so that the energy efficiency of the unit is relatively low, which will lead to a decrease in the heating seasonal performance coefficient of the unit

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