The invention provides an
air conditioning system and a control method thereof, and relates to the
air conditioning technology field. The
air conditioning system and the control method thereof solve the technical problem that a part of gaseous
refrigerant is mixed in
refrigerant after being throttled by an existing air conditioning
system, and therefore heat exchange effect of an indoor
heat exchanger is influenced. The air conditioning system comprises a compressor, a condenser, a throttling device, a switching device, an
evaporator and a flash
evaporator, wherein the compressor is provided with a plurality of air cylinders, the
evaporator is composed of a plurality of heat exchangers, the flash evaporator comprises a first flash evaporator and a second flash evaporator which are connected in parallel, the compressor, the condenser, the throttling device, the second flash evaporator and the evaporator can form a
refrigeration or dehumidification circuit, the compressor and he evaporator can form a heating circuit, and temperature and
humidity independent control is realized by changing flow paths of the
refrigerant discharged from the compressor and the condenser through the switching device. The flash evaporator collects and separates the gaseous refrigerant in the refrigerant after being throttled, avoids the situation that the gaseous refrigerant enters the heat exchangersand then influences heat exchange efficiency of the heat exchangers, and reduces
power consumption of the compressor, thereby improving the energy efficiency level of the compressor.