| 摘要 |
<p>Provided is a freezing circuit including a compressor such as a compressor having a built-in motor, a condenser, a decompression/expansion means, and an evaporator. The freezing circuit uses R1234yf as a coolant and arranges a radical-capturing agent or a polymerization-preventing agent in the freezing circuit. When the R1234yf as a new coolant is used and there is a possibility that radicals are formed, it is possible to prevent or suppress generation of radicals and prevent polymerization of R1234yf so that a target performance can be obtained even when the new coolant is used.</p> |
