Air-conditioning system and control method thereof

Abstract

The invention provides an air-conditioning system. According to the air-conditioning system, a compressor, a four-way valve, an outdoor heat exchanger, a subcooler, a throttling component and an indoor heat exchanger are arranged in sequence to form a refrigerating loop; the outdoor heat exchanger comprises a first current collecting device, a second current collecting device and a plurality of current passing pipes which are connected between the first current collecting device and the second current collecting device; the subcooler comprises a first current passing channel and a second current passing channel, the first end of the first current passing channel communicates with the second current collecting device, and the second end of the first current passing channel communicates with the throttling component; the first end of the second current passing channel communicates with the low-pressure air suction end of the compressor, and the second end of the second current passing channel is connected with a first electromagnetic valve in series and communicates to the second end of the first current passing channel; and a switching device and at least one current passing pipe are connected in series and arranged between the first current collecting device and the second current collecting device, and the switching device further communicates with the first electromagnetic valve. The invention further relates to a control method. By the adoption of the control method, a low-temperature heating deicing function of the air-conditioning system is achieved, and normal drainage of drainage holes in the bottoms of the heat exchangers is guaranteed.

Description

technical field [0001] The invention relates to the refrigeration field, in particular to an air conditioning system and a control method thereof. Background technique [0002] Under normal circumstances, domestic multi-connection external unit products often use ordinary frequency conversion high-pressure chamber scroll compressors, that is, non-enthalpy-increasing scroll frequency conversion compressors. Compared with enthalpy-injection frequency conversion scroll compressors, they have "same frequency, low capacity , The same capacity, low energy efficiency, high high-frequency exhaust temperature, low heating capacity under low temperature conditions" shortcomings. At the same time, heating in winter in cold regions, such as the Northeast and Northwest regions, still mainly uses burning fossil raw materials, which not only causes a lot of environmental pollution, but also causes energy waste. [0003] There is still a problem to be solved in the existing low-temperature...

AI Technical Summary

Problems solved by technology

This kind of problem is that in cold areas, such as the northeast, northwest, and the north of the Yangtze River, the temperature may drop suddenly. For example, the temperature is close to 0°C during the day and there is sleet, but the temperature drops sharply at night, and the rain and snow become ice blocks. If the drain hole is blocked, although the external unit is defrosting at this time, it cannot drain normally due to the blockage of the drain hole, causing the liquid condensed water to turn into ice again, and the frost layer on the outdoor heat exchanger will continue to grow due to frequent defrosting , which will eventually affect the heat transfer of the outdoor heat exchanger, which will greatly affect the heat transfer performance and reliability of the unit

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