Air conditioning system and control method thereof

Abstract

An air conditioning system and a startup control method. The air conditioning system includes: 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; the air conditioning system further includes a thermal power source which is thermally coupled to the thermal temperature sensing bulb and controlledly cools or heats the thermal temperature sensing bulb. The thermal temperature sensing bulb is cooled or heated, as needed, by a thermal power source thermally coupled to the thermal temperature sensing bulb, thereby enabling the thermal expansion valve associated with the thermal temperature sensing bulb to be opened and closed more smoothly.

What is claimed is: 
     
         1 . An 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; the air conditioning system further comprising a thermal power source which is thermally coupled to the thermal temperature sensing bulb and controlledly cools or heats the thermal temperature sensing bulb. 
     
     
         2 . The air conditioning system according to  claim 1 , wherein the thermal power source controlledly cools the thermal temperature sensing bulb before the compressor is started. 
     
     
         3 . The air conditioning system according to  claim 1 , wherein during steady state operation of the air conditioning system, the thermal power source controlledly cools or heats the thermal temperature sensing bulb to adjust the degree of superheat of the evaporator outlet. 
     
     
         4 . The air conditioning system according to  claim 1 , wherein the thermal power source comprises a thermoelectric sheet disposed on the thermal temperature sensing bulb, or an energy storage device disposed on the thermal temperature sensing bulb, and the energy storage device draws and stores heat from the evaporator or the condenser during operation of the air conditioning system. 
     
     
         5 . 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.   
     
     
         6 . The startup control method according to  claim 5 , wherein the thermal power source pre-cools the thermal temperature sensing bulb for a target time of 1-60 seconds. 
     
     
         7 . The startup control method according to  claim 6 , wherein the thermal power source pre-cools the thermal temperature sensing bulb for a target time of 10-25 seconds. 
     
     
         8 . The startup control method according to  claim 5 , wherein the thermal power source pre-cools the thermal temperature sensing bulb to a target temperature in a range of ±10° C. from a final stable temperature of the thermal temperature sensing bulb. 
     
     
         9 . The startup control method according to  claim 6 , wherein the thermal power source pre-cools the thermal temperature sensing bulb to a target temperature which corresponds to a final stable temperature of the thermal temperature sensing bulb. 
     
     
         10 . 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.