Air conditioning system and control method thereof

A control method of an air conditioning system, the air conditioning system comprising:

• a compressor, a condenser, a thermal expansion valve and an evaporator connected via a pipeline;
• and a thermal temperature sensing bulb disposed on an outlet pipeline of the evaporator and associated with the thermal expansion valve;
• and the air conditioning system further comprising a thermal power source which is thermally coupled to the thermal temperature sensing bulb;
• the control method comprising:
• the thermal power source controlledly pre-cooling the thermal temperature sensing bulb before the compressor is started, so that a range of valve opening degree oscillation of the thermal expansion valve caused by a temperature change of the thermal temperature sensing bulb is reduced.

A control method of an air conditioning system, the air conditioning system comprising:

• a compressor, a condenser, a thermal expansion valve and an evaporator connected via a pipeline;
• and
• a thermal temperature sensing bulb disposed on an outlet pipeline of the evaporator and associated with the thermal expansion valve;
• and the air conditioning system further comprising a thermal power source which is thermally coupled to the thermal temperature sensing bulb;
• the control method comprising:
• the thermal power source controlledly cooling or heating the thermal temperature sensing bulb to adjust the degree of superheat of the evaporator outlet, during steady state operation of the air conditioning system.