Refrigeration Circuit

Abstract

A refrigeration circuit provided with a scroll compressor for compressing a refrigerant, characterized in that R1234yf is used as the refrigerant and a polyol ester is used as a lubricating oil for the refrigeration circuit. In this refrigeration circuit, an undesirable reaction product can be prevented from accumulating. The refrigeration circuit hence is reduced in environmental burden and has the same operating stability as in conventional ones.

1 . A refrigeration circuit comprising a scroll compressor for compressing a refrigerant, wherein R1234yf is said refrigerant, and a polyol ester is a lubricating oil for said refrigeration circuit. 
     
     
         2 . The refrigeration circuit according to  claim 1 , wherein a main constituent of said polyol ester is a compound having no ether bond. 
     
     
         3 . The refrigeration circuit according to  claim 1 , wherein said lubricating oil also comprises a compound having an ether bond. 
     
     
         4 . The refrigeration circuit according to  claim 1 , wherein said polyol ester is a hindered ester. 
     
     
         5 . The refrigeration circuit according to  claim 4 , wherein said polyol ester comprises at least one compound selected from the group consisting of neopentyl glycol, trimethylolethane, trimethylolpropane, trimethylolbutane, pentaerythritol and dipentaerythritol. 
     
     
         6 . The refrigeration circuit according to  claim 1 , wherein said polyol ester comprises at least one compound selected from the group consisting of linear or branched fatty acids having a carbon number in a range of 5 to 18. 
     
     
         7 . The refrigeration circuit according to  claim 1 , wherein said lubricating oil contains an additive. 
     
     
         8 . The refrigeration circuit according to  claim 7 , wherein said additive comprises at least one additive agent selected from the group consisting of an extreme pressure agent, an acid capturing agent, an antioxidant and a metal deactivating agent. 
     
     
         9 . The refrigeration circuit according to  claim 1 , wherein said refrigeration circuit is a refrigeration circuit an air conditioning system for vehicles.