Heat transfer compositions comprising 2,3,3,3-tetrafluoropropene and ammonia

1. Composition comprising:

a heat-transfer fluid consisting essentially of a quasi-azeotropic or azeotropic composition of from 15% to 30% ammonia and from 70% to 85% 2,3,3,3-tetrafluoropropene; and

a lubricant oil comprising a polyalkylene glycol, in which the lubricant oil represents from 1% to 99% of the composition.

2. Composition according to claim 1 , in which the heat-transfer fluid consists of a mixture of ammonia and 2,3,3,3-tetrafluoropropene.

3. Composition according to claim 1 , in which the heat-transfer fluid comprises from 18% to 26% ammonia and from 74% to 82% 2,3,3,3-tetrafluoropropene.

4. Composition according to claim 1 , in which the lubricant oil consists of a polyalkylene glycol.

5. Composition according to claim 1 , further comprising one or more additives selected from the group consisting of heat-transfer compounds, stabilizers, surfactants, tracers, fluorescers, odourant agents and solubilizers, and mixtures thereof.

6. Heat-transfer installation comprising a vapour compression circuit containing a heat-transfer composition which is a composition according to claim 1 .

7. Heat transfer installation according to claim 6 , selected from the group consisting of mobile heat-pump heating, or stationary heat-pump heating, air conditioning, refrigeration install freezing installations and Rankine cycles.

8. Heat transfer installation according to claim 6 , which is a motor vehicle air conditioning installation.

9. Composition according to claim 1 , in which the heat-transfer fluid comprises from 21% to 23% ammonia and from 77% to 79% 2,3,3,3-tetrafluoropropene.

10. Composition according to claim 1 , in which the lubricant oil represents from 5% to 50%, of the composition.

11. Composition according to claim 1 , in which the lubricant oil represents from 10% to 40% of the composition.

12. Composition according to claim 1 , in which the lubricant oil represents from 15% to 35% of the composition.

13. Process for heating or cooling a fluid or a body by means of a vapour compression circuit containing a heat-transfer fluid, the said process successively comprising the at least partial evaporation of the heat-transfer fluid, compression of the heat-transfer fluid, the at least partial condensation of the heat-transfer fluid and depressurization of the heat-transfer fluid, in which the heat-transfer fluid is combined with a lubricant oil to form a heat-transfer composition, the said heat-transfer composition being a composition according to claim 1 .

14. Process for reducing the environmental impact of a heat-transfer installation comprising a vapour compression circuit containing an initial heat-transfer fluid, the said process comprising a step of replacing the initial heat-transfer fluid in the vapour compression circuit with a final heat-transfer fluid, the final heat-transfer fluid having a lower GWP than the initial heat-transfer fluid, in which the final heat-transfer fluid is combined with a lubricant oil to form a heat-transfer composition, the said heat-transfer composition being a composition according to claim 1 .

15. A vapour compression circuit comprising a polyalkylene glycol lubricant oil in combination with a heat-transfer fluid, the heat-transfer fluid consisting essentially of a quasi-azeotropic or azeotropic composition of from 15% to 30% ammonia and from 70% to 85% 2,3,3,3-tetrafluoropropene,

in which the polyalkylene glycol is used in a proportion of from 5% to 50%, relative to the sum of the polyalkylene glycol and of the heat-transfer fluid.

16. Vapour compression circuit according to claim 15 , in which the heat-transfer fluid comprises from 18% to 26% ammonia and from 74% to 82% 2,3,3,3-tetrafluoropropene.

17. Vapour compression circuit according to claim 15 , in which the heat-transfer fluid consists of a mixture of ammonia and 2,3,3,3-tetrafluoropropene.

18. Vapour compression circuit according to claim 15 , in which the polyalkylene glycol is used in a proportion of from 10% to 40% relative to the sum of the polyalkylene glycol and of the heat-transfer fluid.

19. Vapour compression circuit according to claim 15 , in which the polyalkylene glycol is used in a proportion of from 15% to 35% relative to the sum of the polyalkylene glycol and of the heat-transfer fluid.

20. Vapour compression circuit according to claim 15 , in which the heat-transfer fluid comprises from 21% to 23% ammonia and from 77% to 79% 2,3,3,3-tetrafluoropropene.

21. A method for increasing the miscibility of 2,3,3,3-tetrafluoropropene with a lubricant oil comprising adding ammonia, to result in composition comprising the lubricant oil and a heat-transfer fluid, the heat-transfer fluid consisting essentially of a quasi-azeotropic or azeotropic composition of ammonia and 2,3,3,3-tetrafluoropropene, and in which the lubricant oil is used in a proportion of from 5% to 50%, relative to the sum of the lubricant oil, 2,3,3,3-tetrafluoropropene and ammonia.

22. Method according to claim 21 , in which ammonia is used in a proportion of from 15% to 30% relative to the sum of the ammonia and of the 2,3,3,3-tetrafluoropropene.

23. Method according to claim 21 , in which the lubricant oil comprises a polyalkylene glycol.

24. Method according to claim 21 , in which ammonia is used in a proportion of from 18% to 26% relative to the sum of the ammonia and of the 2,3,3,3-tetrafluoropropene.

25. Method according to claim 21 , in which ammonia is used in a proportion of from 21% to 23%-relative to the sum of the ammonia and of the 2,3,3,3-tetrafluoropropene.

26. A method for increasing the miscibility of ammonia with a lubricant oil comprising adding 2,3,3,3-tetrafluoropropene, to result in composition comprising the lubricant oil and a heat-transfer fluid, the heat-transfer fluid consisting essentially of a quasi-azeotropic or azeotropic composition of ammonia and 2,3,3,3-tetrafluoropropene, and in which the lubricant oil is used in a proportion of from 5% to 50%, relative to the sum of the lubricant oil, 2,3,3,3-tetrafluoropropene and ammonia.

27. Method according to claim 26 , in which 2,3,3,3-tetrafluoropropene is used in a proportion of from 70% to 85% relative to the sum of the ammonia and of the 2,3,3,3-tetrafluoropropene.

28. Method according to claim 26 , in which the lubricant oil comprises a polyalkylene glycol.