| 摘要 |
<p>If a refrigerant mixture of carbon dioxide (R744) is used in a refrigeration cycle apparatus, a pressure and a discharging temperature are increased. It is an object of the present invention to solve these problems and to obtain more excellent characteristics. A refrigerant mixture comprises carbon dioxide (R744) having non-azeotropic properties and hydrocarbon refrigerant comprising one of propane, cyclopropane, isobutane and butane. If the hydrocarbon refrigerant is propane, the concentration of R744 in the entire refrigerant mixture is 30% or lower by weight. If the hydrocarbon refrigerant is cyclopropane, the concentration of R744 in the entire refrigerant mixture is 40% or lower by weight. If the hydrocarbon refrigerant is isobutane, the concentration of R744 in the entire refrigerant mixture is 60% or lower by weight. If the hydrocarbon refrigerant is butane, the concentration of R744 in the entire refrigerant mixture is 70% or lower by weight. The refrigerant mixture is charged into a refrigeration cycle apparatus.</p> |
