초록

A refrigerant comprising: a hydrofluorocarbon component comprising a mixture of: R134a, R227ea and optionally R125, and not more than 6.5% of a hydrocarbon component; wherein the amount of R227ea and R125 if present, is at least 35% of the hydrofluorocarbon component.

대표청구항 ▼

What is claimed is: 1. A refrigerant comprising a hydrofluorocarbon component comprising a mixture of R134a, R227ea and R125, and from a trace up to 6.5% butane; wherein the amount of R227ea is 30-65% of the hydrofluorocarbon component and the total combined amount of R227ea and R125, is at least 3

What is claimed is: 1. A refrigerant comprising a hydrofluorocarbon component comprising a mixture of R134a, R227ea and R125, and from a trace up to 6.5% butane; wherein the amount of R227ea is 30-65% of the hydrofluorocarbon component and the total combined amount of R227ea and R125, is at least 35% of the hydrofluorocarbon component. 2. A refrigerant as claimed in claim 1, wherein the amount of R134a is 30-70%. 3. A refrigerant as claimed in claim 2, wherein the amount of R134a is 40-70%. 4. A refrigerant as claimed in claim 3, wherein the amount of R134a is 45-65%. 5. A refrigerant as claimed in claim 1, wherein the amount of R227ea is 30-55%. 6. A refrigerant as claimed in claim 5, wherein the amount of R227ea is 30-50%. 7. A refrigerant as claimed in claim 1, wherein the amount of butane is 0.05-6%. 8. A refrigerant as claimed in claim 7, wherein the amount of butane is 2-5%. 9. A refrigerant as claimed in claim 1, wherein the amount of R125 is from a trace to 10%. 10. A refrigerant as claimed in claim 9, wherein the amount of R125 is 2-8%. 11. A refrigerant as claimed in claim 10, wherein the amount of R125 is 3-6%. 12. A refrigerant as claimed in claim 1, wherein the total combined amount of R125 and R227ea is at least 40% of the hydrofluourocarbon component. 13. A refrigerant as claimed in claim 12, wherein the total combined amount of R125 and R227ea is at least 45% of the hydrofluourocarbon component. 14. A refrigerant composition as claimed in claim 1, wherein the speed of sound through the vapour of the refrigerant is equal to or less than 138 m/s at 25째 C. 15. A refrigerant as claimed in claim 14, wherein the speed of sound is between 136 and 125 m/s at 25째 C. 16. A refrigerant as claimed in claim 1 having a maximum pressure not greater than 2 bar greater than that of R12 at 45째 C. 17. A refrigerant as claimed in claim 16, wherein the maximum pressure is 1.5 bar greater than that of R12 at 45째 C. 18. A refrigerant as claimed in claim 17, wherein the maximum pressure is not greater than 1 bar than the pressure of R12 at 45째 C. 19. A refrigerant as claimed in claim 1, having a mean molecular weight of at least 118. 20. A refrigerant as claimed in claim 19, wherein the mean molecular weight is not less than 121.