Air conditioner and method for operating an air conditioner

Abstract

In an air conditioner having a refrigerant conducted in a cooling circuit, the cooling circuit includes, but is not limited to at least one vaporizer situated on a low-pressure side, a condenser situated on a high pressure side, a compressor connected between low-pressure side and high pressure side, and a thermostatic expansion valve connected between high pressure side and low pressure side, furthermore, an inner heat exchanger being provided for transferring heat from the refrigerant on the high-pressure side to refrigerant on the low-pressure side, and the thermostatic expansion valve having a head with a control filling, the characteristic curve of the control filling having a slope s with approximately 0.75 bar/10° C.≦s≦1.05 bar/10° C.

1 . An air conditioner, comprising:
 a refrigerant;   a cooling circuit configured to conduct the refrigerant, the cooling circuit comprising:
 a vaporizer situated on a low-pressure side; 
 a condenser situated on a high-pressure side; 
 a compressor connected between the low-pressure side and the high-pressure side; and 
 a thermostatic expansion valve connected between the high-pressure side and the low-pressure side, the thermostatic expansion valve comprising a head having a control filling, a characteristic curve of the control filling having a slope s with approximately 0.75 bar/10° C.≦s≦approximately 1.05 bar/10° C.; and 
   an inner heat exchanger configured to transmit heat from the refrigerant on the high-pressure side to the refrigerant on the low-pressure side.   
     
     
         2 . The air conditioner according to  claim 1 , wherein the characteristic curve of the control filling has a slope (s) with approximately 0.8 bar/10° C.≦s≦approximately 1.0 bar/10° C. 
     
     
         3 . The air conditioner according to  claim 1 , wherein the characteristic curve of the control filling has a slope (s) with approximately 0.8 bar/10° C.≦s≦approximately 0.9 bar/10° C. 
     
     
         4 . The air conditioner according to  claim 1 , wherein the cooling circuit further comprises a second vaporizer situated on the low-pressure side. 
     
     
         5 . The air conditioner according to  claim 4 , wherein the thermostatic expansion valve is situated before the second vaporizer, the thermostatic expansion valve comprises a second head having the control filling, the characteristic curve of the control filling having a slope (s) with approximately 0.75 bar/10° C.≦s≦1.05 bar/10° C., 
     
     
         6 . The air conditioner according to  claim 5 , wherein the slope (s) is approximately 0.9 bar/10° C.≦s≦1.05 bar/10° C. 
     
     
         7 . The air conditioner according to  claim 5 , wherein the slope (s) is approximately 1.0 bar/10° C.≦s≦1.05 bar/10° C. 
     
     
         8 . The air conditioner according to  claim 1 , wherein the refrigerant conducted in the cooling circuit is R134a. 
     
     
         9 . The air conditioner according to  claim 1 , wherein the refrigerant conducted in the cooling circuit is R1234yf. 
     
     
         10 . A method for operating an air conditioner comprising a cooling circuit, a refrigerant vaporized in a vaporizer while absorbing ambient heat, subsequently compressed using a compressor, and condensed in a condenser before vaporization, comprising:
 withdrawing heat from the refrigerant;   introducing the heat into the cooling circuit between the vaporizer and the compressor; and   relaxing the refrigerant via a thermostatic expansion valve,   wherein a control filling having a characteristic curve used for a head of the thermostatic expansion valve that has a slope (s) with approximately 0.75 bar/10° C.≦s≦approximately 1.05 bar/10° C.   
     
     
         11 . The method according to  claim 10 , wherein the characteristic curve of the control filling has a slope s with approximately 0.8 bar/10° C.≦s≦approximately 1.0 bar/10° C. 
     
     
         12 . The method according to  claim 10 , wherein the characteristic curve of the slope filling has a slope (s) with approximately 0.8 bar/10° C.≦s≦0.9 bar/10° C. 
     
     
         13 . The method according to  claim 10 , wherein the cooling circuit further comprises a second vaporizer situated on a low-pressure side. 
     
     
         14 . The method according to  claim 13 , wherein the thermostatic expansion valve is also situated before the second vaporizer, the thermostatic expansion valve has a second head having the control filling, the characteristic curve of the control filling having a slope (s) with approximately 0.75 bar/10° C.≦s≦approximately 1.05 bar/10° C. 
     
     
         15 . The method according to  claim 14 , wherein the slope is approximately  0 . 9  bar/10° C.≦s≦approximately 1.05 bar/10° C. 
     
     
         16 . The method according to  claim 15 , wherein the slope is approximately 1.0 bar/10° C.≦s≦1.05 bar/10° C. 
     
     
         17 . The method according to  claim 10 , wherein R134a is used as the refrigerant conducted in the cooling circuit. 
     
     
         18 . The method according to  claim 10 , wherein R1234yf is used as the refrigerant conducted in the cooling circuit.