| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress deposition of polymer substance derived from a refrigerant within a refrigerating cycle, suppress deterioration such as clogging of an expansion valve within the refrigerating cycle and enable stable operation for a long time. <P>SOLUTION: In this refrigerating device filled with a refrigerant including hydrofluoroolefin, refrigerating machine oil containing (A) synthetic ester obtained by making pentaerythritol react with 7-9C fatty acid and (B) synthetic ester obtained by making neopentyl glycol or trimethylolpropane react with 7-9C fatty acid is included within a refrigerating circulating route of the refrigerating device. Due to this configuration, a product obtained by polymerization of hydrofluoroolefin in the presence of oxygen can be dissolved, so as to prevent clogging caused by deposition of polymer substance within the refrigerating cycle. <P>COPYRIGHT: (C)2011,JPO&INPIT |
