Heat-transfer fluid for a centrifugal compressor

摘要

A process for cooling or heating a fluid or a body by a vapor compression circuit having a centrifugal compressor and containing a heat transfer fluid, the heat-transfer fluid including at least two of 2,3,3,3-tetrafluoropropene, 1,3,3,3-tetrafluoropropene, 1,1,1,2-tetrafluoroethane, 1,1-difluoroethane and 3,3,3-trifluoropropene, wherein: the ratio of the Mach number of the centrifugal compressor to the Mach number when the centrifugal compressor has, under the same operating conditions, the heat-transfer fluid is replaced with 1,1,1,2-tetrafluoroethane is at least 0.97 and at most 1.03; the compression ratio of the centrifugal compressor is less than or equal to the compression ratio when the centrifugal compressor has, under the same operating conditions, the heat-transfer fluid is replaced with 1,1,1,2-tetrafluoroethane. Also, equipment suitable for implementing this cooling or heating process, and also to a process for converting existing equipment.

主权项

1. A process for converting a vapor compression circuit comprising a centrifugal compressor containing 1,1,1,2-tetrafluoroethane as heat transfer fluid comprising:
removing said 1,1,1,2-tetrafluoroethane from said vapor compression circuit; and adding a substitute heat transfer fluid comprising at least two compounds selected from a group consisting of 2,3,3,3-tetrafluoropropene, 1,3,3,3-tetrafluoropropene, 1,1,1,2-tetrafluoroethane, and 1,1-difluoroethane, and wherein:
a ratio of the Mach number of the centrifugal compressor containing said substitute heat transfer fluid to the Mach number of the centrifugal compressor containing said 1,1,1,2-tetrafluoroethane, under the same operating conditions, is greater than or equal to 0.97 and less than or equal to 1.03; anda compression ratio of the centrifugal compressor containing said substitute heat transfer fluid is less than or equal to the compression ratio of the centrifugal compressor containing said 1,1,1,2-tetrafluoroethane, under the same operating conditions, wherein the centrifugal compressor is provided with rotational speed adaptation means, and wherein:
a rotational speed of the centrifugal compressor in the vapor compression circuit containing said substitute heat transfer fluid is adjusted to a value less than or equal to the rotational speed of the centrifugal compressor in the vapor compression circuit containing said 1,1,1,2-tetrafluoroethane, under the same operating conditions.