REFRIGERANT FOR REFRIGERATING MACHINE, AND HOUSEHOLD ULTRACOLD FREEZING STOREHOUSE

摘要

PROBLEM TO BE SOLVED: To provide a refrigerant for a refrigerating machine of a household ultracold freezing storehouse meeting characteristics including the global warming potential, the silence property, and the energy saving property, which are required as a refrigerant.SOLUTION: The refrigerant for a refrigerating machine is formed as a three-component mixed refrigerant containing carbon dioxide, isobutane and propane in a mixing ratio of 3:4:4. The refrigerating machine to cool a freezing storage chamber for ultracold freezing is combined with a freezing storehouse body having the freezing storage chamber.