| 摘要 |
<p>In a freezing cycle comprising a compressor, a condenser, a depressurization and expansion means, and an evaporator, R1234yf is used as the refrigerant, the refrigerant on the exit side of the evaporator is in superheated state, and the freezing cycle operates in a range of 5 to 16 degrees of superheat, and preferably in the range of 10 to 16 degrees of superheat. When the refrigerant used is changed to the new refrigerant R1234yf, while the effect of an improved high performance coefficient is obtained, the rise in temperature of the discharged refrigerant is appropriately limited so that degradation of freezer oil during freezing can be prevented, and the entire freezing cycle can operate at high efficiency.</p> |
