Working medium, composition for thermal cycle system, thermal cycle device, and thermal cycle method

The patent applies parameter changes by precisely controlling the composition ratios of multiple refrigerant components. Specifically, it limits 1-chloro-2,3,3,3-tetrafluoropropene to 30% by mass or less and 2,3,3,3-tetrafluoropropene to 70% by mass or less, while introducing 1,1,1,2-tetrafluoroethane as a third component. This multi-parameter composition adjustment resolves the contradiction by achieving both acceptable azeotropicity and reduced temperature glide compared to binary mixtures.

The patent resolves this contradiction through parameter changes in composition ratios. By setting 2,3,3,3-tetrafluoropropene at 70% by mass or more while simultaneously limiting 1-chloro-2,3,3,3-tetrafluoropropene to 30% by mass or less and adding 1,1,1,2-tetrafluoroethane, the system achieves high volumetric capacity while maintaining low temperature glide, preventing the temperature glide increase that would occur with higher concentrations of the first component.

The patent applies the composite materials principle by creating a ternary mixture of 1,1,1,2-tetrafluoroethane, 2,3,3,3-tetrafluoropropene, and 1-chloro-2,3,3,3-tetrafluoropropene. This composite composition achieves low global warming potential (GWP of 200 or less) while maintaining good azeotropicity through the synergistic effect of all three components, overcoming the poor azeotropicity limitation of 1,1,1,2-tetrafluoroethane alone.