Method for converting thermal energy into mechanical energy, organic rankine cycle device, and method for replacing working fluid
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United States of America Patent
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Oct 24, 2017
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Nov 28, 2014
filing date -
Nov 29, 2013
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Abstract
Provided is a method for converting thermal energy into mechanical energy by use of an organic rankine cycle system that accommodates a working fluid composition. The method includes sequentially performing: evaporating the working fluid composition; expanding the working fluid composition; condensing the working fluid composition; and transferring the working fluid composition, while raising a pressure thereof, by a pump. The working fluid composition contains cis-1,3,3,3-tetrafluoropropene at a ratio higher than or equal to 92.0% by mass and lower than or equal to 99.9% by mass and trans-1,3,3,3-tetrafluoropropene or 2,3,3,3-tetrafluoropropene at a ratio higher than or equal to 0.1% by mass and lower than or equal to 8.0% by mass; and has an evaporation temperature higher than or equal to 60° C. and lower than or equal to 150° C.
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