Sterically hindered hydrofluoroolefins with dipole moment and their blends with sterically hindered-olefins as refrigerants for high temperature heat pumps and working fluid for organic Rankine cycles

A method comprising:

• compressing a working fluid to form a compressed working fluid, wherein the working fluid comprises:
• at least one C5 or C6 cis or (Z) hydrofluoroolefins;
• and
• at least one C5 or C6 cis olefins, wherein the at least one C5 or C6 cis or (Z) hydrofluoroolefins and the at least one C5 or C6 cis olefins comprise (Z)-1,1,1,4,4,4-hexafluoro-but-2-ene and 2-methyl-but-2-ene in a ratio of about 7:1 to 11:1 or in a ratio of about 6:5 to 4:5;
• condensing the working fluid to form a condensed working fluid,
• expanding the working fluid to form an expanded working fluid;
• and
• heating the working fluid, wherein heat from a heat source is transferred to a heat sink with the working fluid.

A method comprising:

• compressing a working fluid to form a compressed working fluid, wherein the working fluid comprises:
• at least one C5 or C6 cis or (Z) hydrofluoroolefins;
• and
• at least one C5 or C6 cis olefins, wherein the at least one C5 or C6 cis or (Z) hydrofluoroolefins and the at least one C5 or C6 cis olefins comprise 1,1,1,4,4,4-hexafluoro-2-(trifluoromethyl)-but-2-ene and 2-methyl-but-2-ene in a ratio of about 5:2 to 4:1 or in in a ratio of about 7:11 to 1:1;
• condensing the working fluid to form a condensed working fluid,
• expanding the working fluid to form an expanded working fluid;
• and
• heating the working fluid, wherein heat from a heat source is transferred to a heat sink with the working fluid.

A method comprising:

• compressing a working fluid to form a compressed working fluid, wherein the working fluid comprises:
• at least one C5 or C6 cis or (Z) hydrofluoroolefins;
• and
• at least one C5 or C6 cis olefins, wherein the at least one C5 or C6 cis or (Z) hydrofluoroolefins and the at least one C5 or C6 cis olefins comprise 1,1,1,4,4,4-hexafluoro-2-(trifluoromethyl)-but-2-ene and 2,3-dimethyl-but-2-ene in a ratio of about 5:2 to 4:1 or in a ratio of about 7:11 to 1:1;
• condensing the working fluid to form a condensed working fluid,
• expanding the working fluid to form an expanded working fluid;
• and
• heating the working fluid, wherein heat from a heat source is transferred to a heat sink with the working fluid.