| 摘要 |
A refrigerator oil composition for carbon dioxide coolant, which dissolves in supercritical carbon dioxide in an amount of 0.1 mass % or more at a temperature of 100° C. under a pressure of 15 MPa. The above refrigerator oil composition is used in a refrigeration system using a carbon dioxide coolant in a supercritical state, and, in particular, can enhance the heat exchange efficiency during the pass of supercritical carbon dioxide through a heat exchanger and also exhibits good durability and lubricity.
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