Refrigeration apparatus

Abstract

A refrigeration apparatus includes a compressor, a condenser, an expansion mechanism, and an evaporator. A refrigerant containing R32 and refrigerator oil are used in the refrigeration apparatus. The refrigerator oil is used to lubricate the compressor. An acid scavenger added in an amount of 1.0 wt % to 5.0 wt % is blended in the refrigerator oil. The amount of air mixed into the refrigeration apparatus is controlled to 500 ppm or less relative to the amount of filled refrigerant. The amount of water mixed into the refrigeration apparatus is controlled to 300 ppm or less relative to the amount of filled refrigerant. A discharged-gas temperature of the refrigeration apparatus is controlled to 120° C. or less.

1 . A refrigeration apparatus comprising;
 a compressor;   a condenser;   an expansion mechanism; and   an evaporator,   an amount of air mixed in being controlled to 500 ppm or less relative to an amount of filled refrigerant, an amount of water mixed in being controlled to 300 ppm or less relative to the amount of filled refrigerant, and a discharged-gas temperature being controlled to 120° C. or less,   refrigerant containing R32 and refrigerator oil used to lubricate the compressor being used in the refrigeration apparatus, and   an acid scavenger added in an amount of 1.0 to 5.0 wt % being blended with the refrigerator oil.   
     
     
         2 . The refrigeration apparatus according to  claim 1 , wherein
 the acid scavenger is added in an amount of 2.0 to 5.0 wt %.   
     
     
         3 . The refrigeration apparatus according to  claim 1 , wherein
 the expansion mechanism has an expansion valve; and   fluorine is present in an amount of 6.0 wt % or less, and the fluorine is a decomposition product of the refrigerant adhering to the expansion valve.   
     
     
         4 . The refrigeration apparatus according to  claim 1 , wherein
 an extreme pressure agent is further blended with the refrigerator oil.   
     
     
         5 . The refrigeration apparatus according to  claim 1 , wherein
 an antioxidant is further blended with the refrigerator oil.   
     
     
         6 . The refrigeration apparatus according to  claim 1 , wherein
 the refrigerator oil contains polyvinyl ether oil.   
     
     
         7 . The refrigeration apparatus according to  claim 1 , wherein
 the refrigerator oil contains polyol ester oil.   
     
     
         8 . The refrigeration apparatus according to  claim 1 , wherein
 the refrigerant contains at least 60 wt % of R32.   
     
     
         9 . The refrigeration apparatus according to  claim 1 , wherein
 the refrigerator oil is one in which there is no separation in a mixture with the refrigerant during startup.   
     
     
         10 . The refrigeration apparatus according to  claim 9 , wherein
 an oil concentration exhibits a minimum value during startup in a process during which a temperature of the mixture rises, and the oil concentration is a concentration of the refrigerator oil contained in the mixture, and   a temperature at which separation occurs in the mixture for which the oil concentration is the minimum value
 is −35° C. or greater, and 
 is also less than a temperature of the mixture when the oil concentration is the minimum value. 
   
     
     
         11 . The refrigeration apparatus according to  claim 2 , wherein
 the expansion mechanism has an expansion valve; and   fluorine is present in an amount of 6.0 wt % or less, and the fluorine is a decomposition product of the refrigerant adhering to the expansion valve.   
     
     
         12 . The refrigeration apparatus according to  claim 2 , wherein
 an extreme pressure agent is further blended with the refrigerator oil.   
     
     
         13 . The refrigeration apparatus according to  claim 2 , wherein
 an antioxidant is further blended with the refrigerator oil.   
     
     
         14 . The refrigeration apparatus according to  claim 3 , wherein
 an extreme pressure agent is further blended with the refrigerator oil.   
     
     
         15 . The refrigeration apparatus according to  claim 3 , wherein
 an antioxidant is further blended with the refrigerator oil.   
     
     
         16 . The refrigeration apparatus according to  claim 4 , wherein
 an antioxidant is further blended with the refrigerator oil.