Air-source air conditioning system provided with double heat storage devices and defrosting method

Abstract

The invention discloses an air-source air conditioning system provided with double heat storage devices. The air-source air conditioning system comprises a compressor, a four-way reversing valve, an indoor heat exchanger, an outdoor heat exchanger and a refrigerant replenishing machine; air compressed by the compressor is fed via a first interface of the four-way reversing valve, is discharged viaa third interface of the four-way reversing valve and is condensed in the outdoor heat exchanger; the condensed liquid flows to a drying filter sequentially via the refrigerant replenishing machine and a first one-way valve; the liquid is divided into two routes after flowing out of the drying filter, one route of the liquid flows through a seventh electromagnetic valve, a thermal expansion valve, a heat radiating and accumulating heat exchanger, an eighth electromagnetic valve and an injector and afterwards enters the four-way reversing valve together with the air discharged from the compressor; the other route of liquid flows into an air and liquid separator via a third electromagnetic valve, a third one-way valve, a second electromagnetic valve, a fifth electromagnetic valve, the indoor heat exchanger and the four-way reversing valve; and the separated air flows into the compressor to be compressed. The air-source air conditioning system disclosed by the invention adopts double heat-storage heat exchangers, realizes defrosting, provides a low-level heat source capable of continuously supplying heat, and is beneficial for miniaturization of the heat radiating and accumulating heat exchanger.

Description

technical field [0001] The invention relates to an air-source refrigeration and heating air-conditioning system with double heat storage devices and a defrosting method thereof, belonging to the field of refrigeration and heating, ventilating and air-conditioning. Background technique [0002] Air-source air conditioners are currently widely used in residential and commercial air-conditioning products. During heating operation in winter, the heating capacity of the system will decrease with the decrease of the ambient temperature. After the system is turned on, the surface temperature of the indoor heat exchanger must reach a certain temperature to provide heating. Therefore, it takes a long time to run from starting up to achieving the set temperature, which affects comfort; [0003] In addition, when the surface temperature of the outdoor heat exchanger is lower than the dew point temperature of the ambient air and lower than 0°C, frosting will occur. When the frost layer ...

AI Technical Summary

Problems solved by technology

[0004] The reverse cycle defrosting method of the air source heat pump air conditioner has the following problems: the four-way reversing valve needs to be turned on and off periodically, there will be a certain amount of noise, and its own operating life will also be affected; When switching between the two heat exchangers, when the pressure difference between the two heat exchangers is large, the phenomenon of "running oil" will occur, causing the system to fail to operate normally; When it is outdated, it will also absorb its surface waste heat and a small amount of indoor air heat, which will affect the comfort of the indoor environment; because the indoor heat exchanger fan is shut down, the heat of reverse cycle defrosting mainly comes from the work consumption of the compressor, making the defrosting time longer

[0005] In order to solve the heat source problem during the defrosting of air source heat pump air conditioners, scholars have respectively proposed the use of phase change heat storage materials for heat dissipation and heat storage of compressors, or methods of compressing gas sensible heat heat storage and liquid supercooled heat storage to provide defrosting operation. The low-grade heat source can shorten the defrosting time, but these methods are difficult to achieve continuous heating

And because the phase change heat dissipation heat storage heat exchanger using phase change heat storage materials, its volume will increase with the increase of heat storage. If a single heat storage heat exchanger is used to provide low-level heat sources for defrosting and heating at the same time, the heat dissipation The volume of the heat storage heat exchanger will not be conducive to the miniaturization and integrated design of air conditioning products

And the biggest disadvantage of the heat dissipation heat storage heat exchanger that stores the heat dissipation of the compressor is that during cooling operation in summer, the heat dissipation heat storage heat exchanger that wraps the compressor will affect the heat dissipation of the compressor, resulting in a high temperature of the compressor and affecting the operating efficiency of the compressor and stability

Images