The invention provides an
air conditioning system and a control method. The
air conditioning system comprises a circuit board, a double-stage compressor and a flash generator, wherein the double-stagecompressor is provided with a low-pressure inlet and a medium-pressure inlet, and an outlet of the flash generator communicates with the medium-pressure inlet. According to the
air conditioning system and the control method, a heat dissipation
assembly is arranged on the circuit board, cooling is carried out by further utilizing a
refrigerant gravity liquid supply mode in the flash generator, a liquid
refrigerant enters the inner side of the heat dissipation
assembly for heat absorption through the flash generator, the
refrigerant after heat absorption is changed into gas and flows back intothe flash generator, the gas-state refrigerant can also be used for supplementing the gas and increasing the
enthalpy to the two-stage compressor, so that the energy efficiency of the system is improved; and when the heat dissipation
assembly communicates with a heat exchange coil
pipe, sealing circulation is formed between the heat dissipation assembly of the circuit board and the heat exchange coil
pipe, heat of the circuit board can be transferred into the flash generator, namely, the heat of the circuit board can be recycled, so that the
evaporation efficiency in the flash generator is improved, the exhaust volume of the flash generator is increased, and the energy efficiency of the system is improved.