Method for heating and cooling using fluoroether compounds, compositions suitable therefore and their use

A composition of matter comprising at least one compound of formula (I)

• CxFy—O—CF═CFW (I)
• wherein x is 1, 2, 3, 4, 5 or 6 and y=2x+1, and wherein W is F, CF3, C2F5, or C3F7 or formula (II)
• CxFy—O—CX═CYZ (II)
• wherein x and y have the meaning given above, X stands for H or F, Y stands for H or F and Z stands for H, F, CF3 or C2F5 with the proviso that at least one of X, Y or Z are H and that not more than 2 hydrogen atoms are contained in the compound of general formula (II).
• and at least one other organic chemical compound, including azeotropic mixtures and quasi-azeotropic mixtures.

A refrigeration system comprising a refrigerant comprising at least one compound of formula (I)

• CxFy—O—CF═CFW (I)
• wherein x is 1, 2, 3, 4, 5 or 6 and y=2x+1, and wherein W is F, CF3, C2F5, or C3F7 or formula (II)
• CxFy—O—CX═CYZ (II)
• wherein x and y have the meaning given above, X stands for H or F, Y stands for H or F and Z stands for H, F, CF3 or C2F5 with the proviso that at least one of X, Y or Z are H and not more than 2 hydrogen atoms are contained in the compound of general formula (II).

A composition being suitable as a refrigerant, a heat transformer liquid, a heat pipe liquid, a liquid for an organic Rankine cycle (ORC) process, a solvent blowing agent for foam preparation, an aerosol generating fluid, or a fire extinguishant, said composition comprising a compound of general formula (I) or (II) and optionally comprising a non-flammable liquid or gas,

• the general formula (I) being
• CxFy—O—CF═CFW (I)
• wherein x is 1, 2, 3, 4, 5 or 6 and y=2x+1, and wherein W is F, CF3, C2F5, or C3F7,
• or the general formula (II) being
• CxFy—O—CX═CYZ (II)
• wherein x and y have the meaning given above, X stands for H or F, Y stands for H or F and Z stands for H, F, CF3 or C2F5 with the proviso that at least one of X, Y or Z are H, and not more than two hydrogen atoms are contained in the compound of general formula (II).