Patent ID: 8980118
Filing Date: 2015-03-17
Classification: C09K,F25B

Abstract:
1. A heat transfer composition for use as a drop-in or near drop-in replacement for R-404A and R-22 in low temperature refrigeration system having a condenser temperature from about 35° C. to about 45° C. and an evaporator temperature from about −40° C. to −15° C., and medium refrigeration systems having a condenser temperature from about 35° C. to about 45° C. and an evaporator temperature from about −15° C. to 5° C. comprising: (a) about 26% by weight of HFC-32; (b) about 26% by weight of HFC-125; (c) HFO-1234yf and transHFO-1234ze, wherein the amount of transHFO-1234ze and HFO-1234yf together is from about 20% by weight; and (d) about 21% by weight of HFC-134a, with the weight percentages being based on the total of the components (a)-(d) in the composition, wherein the composition exhibits a capacity within about 8% of R404A in said low temperature refrigeration systems, and wherein the composition is non-flammable in accordance with ASTM standard E-681.