Air conditioner system and its defrosting control method

Abstract

The invention discloses an air conditioner system, comprising a compressor, a four-way valve, an indoor heat exchanger, a throttling component and an outdoor micro-channel parallel flow heat exchanger sequentially connected by pipes, and the air conditioner system further includes a bypass A loop and a control device for controlling the conduction of a bypass loop or a four-way valve, one end of the bypass loop is connected with the outlet pipe of the outdoor microchannel advective heat exchanger, and the other end is connected with the outlet pipe of the indoor heat exchanger The control device is used to control the conduction of the bypass circuit to carry out the bypass defrosting or control the four-way valve reversal to carry out the tangential defrosting of the four-way valve when it is judged that the air conditioner needs to be defrosted. The invention also discloses a defrosting control method of the air conditioner system. By adding a bypass loop in the air conditioner system, the invention performs bypass defrosting during low-temperature heating, which is beneficial to increase the low-temperature heating capacity, reduces the number of shutdowns during defrosting, and improves the defrosting efficiency of the air conditioner.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to an air conditioner system and a defrosting control method thereof. Background technique [0002] When the air conditioner is heating, the indoor temperature is high and the outdoor temperature is low. As the temperature of the outdoor heat exchanger drops, condensation will appear on the fins; and when the temperature of the outdoor heat exchanger drops to a certain level, frost will begin to form on the fins, and even ice may form, which will cause heat transfer The channel is blocked, so the heating effect is poor or even no heating. Especially when the micro-channel parallel flow heat exchanger is used as the outdoor heat exchanger, the frosting speed will be faster during operation, and the defrosting time will be longer. As a result, the refrigerant stays in the flat tube at the bottom, and the temperature of the refrigerant in the flat tube at the bottom is lower...

AI Technical Summary

Problems solved by technology

As the temperature of the outdoor heat exchanger drops, condensation will appear on the fins; and when the temperature of the outdoor heat exchanger drops to a certain level, frost will begin to form on the fins, and even ice may form, which will cause heat transfer The channel is blocked, so the heating effect is poor or even no heating

Especially when the micro-channel parallel flow heat exchanger is used as the outdoor heat exchanger, the frosting speed will be faster during operation, and the defrosting time will be longer. As a result, the refrigerant stays in the flat tube at the bottom, and the temperature of the refrigerant in the flat tube at the bottom is lower than that in other flat tubes, so the frost condensed in the flat tube at the bottom of the microchannel parallel flow heat exchanger is difficult to remove. thus affecting the heating effect

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