in the final cascade stage and Z-1,1,1,4,4,4- hexa-fluoro-2- generation of heat in the cascade heat pump using a working fluid comprising butene

摘要

A method for generating heat in cascade heat pump with a low temperature cascade stage and high-temperature cascade stage In the condenser at high temperature cascade stage, condensing the vapor working fluid comprising a Z-1,1,1,4,4,4- hexafluoro-2-butene, the process thereby generating a liquid working fluid it contains at will, low temperature cascade stage, CO ₂ , N ₂ O, E-HFO-1234ye, HFC-1243zf, HFC-125, HFC-143a, HFC- 152a, HFC-161 and mixtures thereof, or HFC-134a, a method of containing a working fluid is selected from the group consisting of a mixture of HFC-32, HFO-1234yf, or trans-HFO-1234ze are disclosed . Also in the high-temperature cascade stages and contains a working fluid comprising a Z-1,1,1,4,4,4- hexafluoro-2-butene and CO ₂ , N ₂ O, E-HFO-1234ye, HFC-1243zf, HFC-125, HFC-143a, HFC-152a, HFC-161, and mixtures thereof, or HFC-134a, HFC-32, HFO-1234yf or cascade heat pump apparatus containing a working fluid is selected from the group consisting of a mixture of trans-HFO-1234ze are also disclosed.