| 摘要 |
PROBLEM TO BE SOLVED: To provide an alternative coolant to R22 and R502 which coolant forms an azeotropic composition and has a high critical temperature by mixing propylene, difluoromethane and pentafluoroethane. SOLUTION: A mixed coolant for a refrigeration cycle device is obtained by blending not more than 40 wt.% of propylene (R1270), difluoromethane (R32) and pentafluoroethane (R125). This mixed coolant has an almost-equal cooling capacity to a non-azeotropic mixed coolant, R410A, consisting of 50 wt.% of R32 and 50 wt.% of R125, at a normal temperature. Because this mixed coolant contains R1270, which has a small coolant density, the amount of the coolant for filling can be reduced. A detrimental effect on the stratosphere ozone layer can be avoided with this mixed coolant and the global warming coefficient can be reduced in comparison with R410A. A refrigeration cycle device with this mixed coolant can be operated reliably by using a dryer for removing moisture. |
