| 摘要 |
PROBLEM TO BE SOLVED: To provide compositions, methods and systems having utility in refrigeration applications, with particular benefit in medium and low temperature refrigeration applications, and in particular, refrigerant compositions for replacement of HFC-404A and systems designed for use with HFC-404A.SOLUTION: A heat transfer composition comprises: (a) from about 10% to about 35% of HFC-32; (b) from about 10% to about 35% of HFC-125; (c) from more than 0% to about 30% of HFO-1234ze; and (d) from about 10% to about 30% of HFC-134a, with the weight percent based on the total of the components (a)-(d) in the composition. |
