Heat Transfer Compositions, Systems, and Methods

摘要

Heat transfer compositions, methods, efficiencies, and systems are disclosed. The compositions have four or more heat transfer components/constituents that have been selected such that the compositions provide a flammability rating of Al or better as defined by IS0817:2014, and a 14% or greater variance-to-liquid pressure at a temperature of 37.8° C. (100° F.). The compositions also reduce the amount of R125 needed to achieve a flammability rating of Al or better. The method of designing an HCFC-free heat transfer composition includes selecting four or more constituents with staggered boiling temperatures and blending the constituents together.

主权项

1. An HCFC-free heat transfer composition for a heat transfer system, comprising:
at least first, second, third, and fourth additional constituents; and wherein the amounts of the at least first, second, third, and fourth additional constituents are selected such that the heat transfer composition has (i) a flammability rating of A1 or better as defined by IS0817:2014, and (ii) a 14% or greater variance-to-liquid pressure at a temperature of 37.8° C. (100° F.), wherein the variance-to-liquid pressure is the ratio of the difference between liquid pressure and vapor pressure of the composition at 37.8° C. (100° F.) over the liquid pressure of the composition at 37.8° C. (100° F.), and (iii) no more than 10% by weight of R125.