| abstract |
One embodiment of the invention relates to a working fluid and their use, the working fluid comprising a compound having the structure of formula (I); R 1 , R 2 , R 3 , and R 4 in the formula are C 1 -C 6 alkyl, at least C 6 aryl, optionally substituted with H, F, Cl, Br, and at least one F, Cl, or Br Each independently selected from the group consisting of C 3 cycloalkyl, and C 6 -C 15 alkylaryl, provided that any R is Br, the compound does not contain hydrogen. The working fluid is useful in Rankine cycle systems that efficiently convert waste heat generated in industrial processes, such as power generation from fuel cells, into mechanical energy or electrical force. The working fluid of the present invention is also useful for devices using other thermal energy conversion processes and cycles. |