Air conditioning system and control method thereof

Abstract

The invention provides an air conditioning system and a control method thereof. The system involves an outdoor unit and at least one indoor unit; the outdoor unit comprises a compressor, an outdoor heat exchanger, a first throttling device, a pressure adjusting module and a cold accumulation module, wherein the pressure adjusting module comprises a second four-way valve, a one-way valve and a second throttling device, the first end of the second four-way valve is connected with a high-pressure air pipe, the second end of the second four-way valve is connected with an air return port of the compressor, the third end of the second four-way valve is connected with a low-pressure air pipe through the one-way valve, and the fourth end of the second four-way valve is connected with the low-pressure air pipe through the second throttling device; and the cold accumulation module comprises a cold accumulator, a cold accumulation throttling device, a first control valve and a second control valve, wherein the first end of the cold accumulator is connected between the outdoor heat exchanger and the first throttling device through the cold accumulation throttling device, the second end of thecold accumulator is connected with the fourth end of the second four-way valve through the first control valve, and the second end of the cold accumulator is also connected with a high-pressure liquidpipe through the second control valve.

Description

technical field [0001] The invention relates to the technical field of household appliances, in particular to an air conditioning system and a control method for the air conditioning system. Background technique [0002] In hot summer, the outdoor temperature is high at noon, the heat dissipation effect of the condenser is poor, and the high pressure of the refrigeration system is high. In order to ensure reliability, the cooling capacity output of the system has to be limited, but at this time the cooling demand is very large, and the system cannot meet the cooling demand; In the middle of the night, the outdoor temperature is low, the heat dissipation effect of the condenser is good, and the cooling capacity of the system is good. However, at this time, the cooling demand is less than that in the daytime, and the cooling capacity is surplus. Frequent shutdowns occur, and the energy efficiency of the system operation decreases. If part of the cooling capacity at night can b...

AI Technical Summary

Problems solved by technology

[0003] At present, there is a heat pump system with cold storage, but there are the following problems: the evaporation temperature of the cold storage is not consistent with that of the indoor unit. For the cold storage, in order to reduce the cost and volume, ice storage is the best choice. However, ice storage requires The evaporation temperature of the refrigeration system is lower than 0°C. For the indoor unit, on the one hand, in order to ensure that the indoor unit will not freeze, the evaporation temperature of the refrigeration system is required to be higher than 0°C. The demand is small, in order to improve the energy efficiency of the system and reduce the start and stop, the evaporation temperature of the refrigeration system is required to be as high as possible

Therefore, the requirements of the two are opposite. The cold storage and the refrigeration indoor unit have different requirements for the evaporation pressure of the system. To meet the requirements of the cold storage, the evaporation pressure needs to be reduced. At this time, the energy efficiency of the system decreases and the output capacity of the indoor unit is too large. Start and stop, and the heat exchanger is at risk of freezing

In addition, when defrosting, the amount of liquid returned during defrosting is large, and defrosting is slow, which affects the reliability of the compressor and the comfort of the room.

This problem makes it more difficult to apply cold storage in the air conditioning system, and generally only an additional dedicated cold storage system can be added

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