Air conditioning apparatus

Abstract

An air conditioning includes a refrigerant circuit and a blower fan. The refrigerant circuit has a compressor, a condenser, a first expansion valve, a second expansion valve, and an evaporator sequentially connected. The blower fan is arranged and configured to supply air as a heat source to the condenser. An air flow rate of the blower fan and an opening degree of the first expansion valve are controlled such that high pressure in a refrigeration cycle operation of the refrigerant circuit becomes a target high pressure.

1 . An air conditioning apparatus comprising:
 a refrigerant circuit having a compressor, a condenser, a first expansion valve, a second expansion valve, and an evaporator sequentially connected; and   a blower fan arranged and configured to supply air as a heat source to the condenser,   an air flow rate of the blower fan and an opening degree of the first expansion valve being controlled such that high pressure in a refrigeration cycle operation of the refrigerant circuit becomes a target high pressure.   
     
     
         2 . The air conditioning apparatus according to  claim 1 , wherein
 the opening degree of the first expansion valve is controlled such that the high pressure becomes the target high pressure in a state where air flow rate control of the blower fan has been performed such that the air flow rate of the blower fan becomes a prescribed air flow rate, and   the prescribed air flow rate is changed by air flow rate control of the blower fan when the high pressure does not become the target high pressure by controlling the opening degree of the first expansion valve.   
     
     
         3 . The air conditioning apparatus according to  claim 2 , wherein
 a receiver is connected between the first expansion valve and the second expansion valve to accumulate refrigerant.   
     
     
         4 . The air conditioning apparatus according to  claim 3 , wherein
 an opening degree of the second expansion valve is controlled such that
 a degree of superheat of refrigerant in an outlet of the evaporator becomes a target degree of superheat or 
 a state quantity equivalent to the degree of superheat becomes a target state quantity equivalent to the target degree of superheat.