| 摘要 |
PURPOSE:To provide a working fluid having only small effects on the stratospheric ozone layer, alternative to dichlorodifluoromethane (R12), comprising a trifluorethane, chlorodifluoromethane and a chlorodifluorethane at specified proportion. CONSTITUTION:The objective working fluid comprising (A) <=60 (pref. <=50)wt.% of 1,1,1-trifluorethane (R143a), (B) <=75 (pref. <=65)wt.% of chlorodifluoromethane (R22), and (C) 25-70 (pref. 35-70)wt.% of 1-chloro-1,1-difluorethane (R142b). The working fluid is used in refrigerating machines, heat pumps, etc. |
