Process for cooling or heating a fluid or a body by means of a vapour compression circuit comprising a centrifugal compressor provided with rotational speed adaptation means and containing a heat transfer fluid, the heat transfer fluid comprising a mixture: wherein: - of 20% to 70% of 1,3,3,3-tetrafluoropropene and of 30% to 80% of 3,3,3-trifluoropropene, in proportions by weight; or - of 10% to 90% of 2,3,3,3-tetrafluoropropene, of 5% to 70% of 1,3,3,3-tetrafluoropropene and of 5% to 30% of 1,1-difluoroethane, in proportions by weight; - of 10% to 60% of 1,3,3,3-tetrafluoropropene, of 20% to 87% of 1,1,1,2-tetrafluoroethane and of 3% to 20% of 1,1-difluoroethane, in proportions by weight; or - of 25% to 82% of 1,3,3,3-tetrafluoropropene, of 3% to 15% of 1,1-difluoroethane and of 15% to 60% of 3,3,3-trifluoropropene, in proportions by weight; - the ratio of the Mach number of the centrifugal compressor to the Mach number that the centrifugal compressor has, under the same operating conditions, when the heat transfer fluid is replaced by 1,1,1,2-tetrafluoroethane in the vapour compression circuit, is greater than or equal to 0.97 and less than or equal to 1.03; - the compression ratio of the centrifugal compressor is less than or equal to the compression ratio that the centrifugal compressor has, under the same operating conditions, when the heat transfer fluid is replaced by 1,1,1,2-tetrafluoroethane in the vapour compression circuit; and - the rotational speed of the centrifugal compressor is less than or equal to the rotational speed that the centrifugal compressor has, under the same operating conditions, when the heat transfer fluid is replaced by 1,1,1,2-tetrafluoroethane in the vapour compression circuit. wherein: - of 20% to 70% of 1,3,3,3-tetrafluoropropene and of 30% to 80% of 3,3,3-trifluoropropene, in proportions by weight; or - of 10% to 90% of 2,3,3,3-tetrafluoropropene, of 5% to 70% of 1,3,3,3-tetrafluoropropene and of 5% to 30% of 1,1-difluoroethane, in proportions by weight; - of 10% to 60% of 1,3,3,3-tetrafluoropropene, of 20% to 87% of 1,1,1,2-tetrafluoroethane and of 3% to 20% of 1,1-difluoroethane, in proportions by weight; or - of 25% to 82% of 1,3,3,3-tetrafluoropropene, of 3% to 15% of 1,1-difluoroethane and of 15% to 60% of 3,3,3-trifluoropropene, in proportions by weight; - the ratio of the Mach number of the centrifugal compressor to the Mach number that the centrifugal compressor has, under the same operating conditions, when the heat transfer fluid is replaced by 1,1,1,2-tetrafluoroethane in the vapour compression circuit, is greater than or equal to 0.97 and less than or equal to 1.03; - the compression ratio of the centrifugal compressor is less than or equal to the compression ratio that the centrifugal compressor has, under the same operating conditions, when the heat transfer fluid is replaced by 1,1,1,2-tetrafluoroethane in the vapour compression circuit; and - the rotational speed of the centrifugal compressor is less than or equal to the rotational speed that the centrifugal compressor has, under the same operating conditions, when the heat transfer fluid is replaced by 1,1,1,2-tetrafluoroethane in the vapour compression circuit. - of 20% to 70% of 1,3,3,3-tetrafluoropropene and of 30% to 80% of 3,3,3-trifluoropropene, in proportions by weight; or - of 10% to 90% of 2,3,3,3-tetrafluoropropene, of 5% to 70% of 1,3,3,3-tetrafluoropropene and of 5% to 30% of 1,1-difluoroethane, in proportions by weight; - of 10% to 60% of 1,3,3,3-tetrafluoropropene, of 20% to 87% of 1,1,1,2-tetrafluoroethane and of 3% to 20% of 1,1-difluoroethane, in proportions by weight; or - of 25% to 82% of 1,3,3,3-tetrafluoropropene, of 3% to 15% of 1,1-difluoroethane and of 15% to 60% of 3,3,3-trifluoropropene, in proportions by weight; - the ratio of the Mach number of the centrifugal compressor to the Mach number that the centrifugal compressor has, under the same operating conditions, when the heat transfer fluid is replaced by 1,1,1,2-tetrafluoroethane in the vapour compression circuit, is greater than or equal to 0.97 and less than or equal to 1.03; - the compression ratio of the centrifugal compressor is less than or equal to the compression ratio that the centrifugal compressor has, under the same operating conditions, when the heat transfer fluid is replaced by 1,1,1,2-tetrafluoroethane in the vapour compression circuit; and - the rotational speed of the centrifugal compressor is less than or equal to the rotational speed that the centrifugal compressor has, under the same operating conditions, when the heat transfer fluid is replaced by 1,1,1,2-tetrafluoroethane in the vapour compression circuit.