| 摘要 |
<p>A refrigeration cycle provided with a compressor, a condenser, a pressure reduction and expansion means, an evaporator, and an internal heat exchanger for exchanging heat between the refrigerant at the exit side of the condenser and the refrigerant at the exit side of the evaporator, wherein the refrigeration cycle uses R1234yf as the refrigerant and the amount of heat exchange by the internal heat exchanger is greater than or equal to a specific value that has been determined beforehand by a simulation or an experiment. When a currently used refrigerant is changed to a new refrigerant R1234yf, the refrigeration cycle can be operated with a refrigeration ability as same as or greater than that of refrigeration cycles using a conventional refrigerant R134a.</p> |
