Patent ID: 7428816

Claim:
An organic Rankine cycle system comprising a working fluid comprising at least one compound having the following structure: where x, y, z, and m are each selected from the group consisting of: fluorine, hydrogen, R f , and R, wherein R and R f are each an alkyl, aryl, or alkylaryl of 1 to 6 carbon atoms, and wherein R f is partially or fully fluorinated, wherein said compounds have the formula C x′ F y′ H z′ where x′ is 12-b, where b is an integer from between about 0 to about 6, y′ is 2x′−z′, and for x′/2 and 2x′/3 equals integers then z′ is 2x′/3; for x′/2 and 3x′/4 equals integers then z′ is 3x′/4; for x′/2 not equal to integer then z′ is x′−2; for x′/2 and x′/5 equals integers then z′ is x′−3; and a heat exchanger.