| 摘要 |
<p>A supercritical refrigeration cycle wherein CO2 is used as a coolant and the pressure at the high pressure side is higher than the critical point of the coolant, characterized in that a part of an lubricating oil is circulated together with the coolant, and the lubricating oil does not contain an epoxy based acid capturing agent or an additive which undergoes thermal decomposition at the high pressure side into decomposition products forming, through a chemical reaction, a compound exhibiting low solubility in the coolant. The supercritical refrigeration cycle allows the prevention of the formation of precipitates at a portion wherein the coolant is reduced in pressure.</p> |
