Air conditioner system and defrosting method thereof

Abstract

The invention discloses an air conditioner system and a defrosting method thereof, comprising an indoor heat exchanger, a throttling device, an outdoor heat exchanger, a four-way reversing valve, an indoor heat exchanger and an outdoor heat exchanger arranged on a refrigerant circulation path. The heat exchanger is connected to the compressor through a four-way reversing valve, and also includes: a hot liquid pipeline, connected between the indoor heat exchanger and the outdoor heat exchanger, for the refrigerant to enter the outdoor in the form of hot liquid during defrosting Heat exchanger for hot liquid defrosting. Compared with the hot air defrosting method in the prior art, the present invention adopts the hot liquid defrosting method, which has the advantages of non-stop defrosting, short defrosting time, extremely rapid defrosting, and uninterrupted heat supply to the room during the defrosting process.

Description

technical field [0001] The invention relates to the field of air conditioners, in particular to an air conditioner system and a defrosting method thereof. Background technique [0002] At present, the defrosting method adopted by domestic heat pump air conditioners and water heaters is to use the exhaust temperature of the compressor to perform hot air defrosting. The specific defrosting process is: enter the defrosting mode-compressor stop-four-way valve reversing-compressor start-hot air flushing-compressor stop-four-way valve reversing-compressor start-cooling air-defrosting end . There are following deficiencies in this defrosting process: [0003] 1. A defrosting cycle needs to start and stop the compressor twice, which consumes a lot of energy and has a great impact on the power grid. Frequent starts and stops greatly reduce the life of the compressor; [0004] 2. The four-way valve changes direction twice in a defrosting cycle, which is easy to wear the internal sl...

AI Technical Summary

Problems solved by technology

[0003] 1. A defrosting cycle needs to start and stop the compressor twice, which consumes a lot of energy and has a great impact on the power grid. Frequent starts and stops greatly reduce the life of the compressor;

[0004] 2. The four-way valve changes direction twice in a defrosting cycle, which is easy to wear the internal slider, resulting in an increase in the failure rate of the four-way valve and shortening the life of the four-way valve;

[0005] 3. It takes about 4 minutes to change the direction of the four-way valve and start and stop the compressor, and the whole defrosting process takes about 12 minutes, and it takes longer in harsh environments;

[0006] 4. There is no heating in the room during defrosting. After defrosting, it needs to be cooled for a while before it can be heated normally, which seriously affects the indoor comfort;

[0007] 5. The defrosting only relies on the exhaust of the compressor to carry out the hot air to defrost. The energy comes from the work of the compressor. The energy used for defrosting can only reach the maximum operating power of the compressor. In harsh environments, the defrosting time is long or the defrosting time is long. unclean;

[0008] 6. When the compressor is running, the wall surface exchanges heat with the external environment to dissipate heat, causing the exhaust temperature to drop and wasting energy

[0010] 1. The refrigerant is not throttled and evaporated during defrosting, and there is no complete refrigeration cycle, which will cause the high and low pressure difference in the system to be difficult to establish, and the compressor's operating reliability is poor;

[0011] 2. The refrigerant flowing through the outdoor heat exchanger and the refrigerant flowing through the heat accumulator may be in a wet steam state after mixing, which will cause wet compression of the compressor after entering the compressor, which will seriously shorten the service life of the compressor and cause outdoor machine strong vibration

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