Heat-transfer fluid for a centrifugal compressor
A process for cooling or heating a fluid or a body by means of a vapor compression circuit including a centrifugal compressor and containing a heat-transfer fluid, the heat-transfer fluid including at least two compounds selected from 2,3,3,3-tetrafluoropropene, 1,3,3,3-tetrafluoropropene, 1,1,1,2-tetrafluoropropene, 1,1-difluoroethane and 3,3,3-trifluoropropene, in which: the ratio of the Mach number of the centrifugal compressor to the Mach number which the centrifugal compressor has under the same operating conditions if the heat-transfer fluid is replaced with 1,1,1,2-tetrafluoroethane in the vapor 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 which the centrifugal compressor has under the same operating conditions if the heat-transfer fluid is replaced with 1,1,12-tetrafluorethane in the vapor compression circuit.
1. A process for converting a vapor compression circuit comprising a centrifugal compressor containing 1,1,1,2-tetrafluoroethane as heat transfer fluid, the method 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,
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;
a 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; and
the centrifugal compressor is devoid of rotational speed adaptation means.
2. The process as claimed in claim 1 , wherein the substitute heat transfer fluid comprises a mixture selected from the group consisting of:
2,3,3,3-tetrafluoropropene and 1,1,1,2-tetrafluoroethane;
2,3,3,3-tetrafluoropropene, 1,1,1,2-tetrafluoroethane and 1,1-difluoroethane; and
1,3,3,3-tetrafluoropropene, 1,1,1,2-tetrafluoroethane and 1,1-difluoroethane.
3. The process as claimed in claim 1 , wherein the vapor compression circuit comprises an evaporator and a condenser, and wherein:
a difference between the pressure at the condenser and the pressure at the evaporator in the final vapor compression circuit containing said substitute heat transfer fluid is less than or equal to the difference between the pressure at the condenser and the pressure at the evaporator in the vapor compression circuit containing said 1,1,1,2-tetrafluoroethane, under the same operating conditions.
4. The process as claimed in claim 1 , wherein the substitute heat transfer fluid comprises a mixture selected from the group consisting of:
from 2% to 50% of 2,3,3,3-tetrafluoropropene and from 50% to 98% of 1,1,1,2-tetrafluoroethane;
from 10% to 93% of 2,3,3,3-tetrafluoropropene, from 5% to 80% of 1,1,1,2-tetrafluoroethane and from 2% to 50% of 1,1-difluoroethane; and
from 10% to 60% of 1,3,3,3-tetrafluoropropene, from 20% to 87% of 1,1,1,2-tetrafluoroethane and from 3% to 20% of 1,1-difluoroethane.
5. The process as claimed in claim 1 , wherein the substitute heat transfer fluid comprises a mixture selected from the group consisting of:
from 2% to 50% of 2,3,3,3-tetrafluoropropene and from 50% to 98% of 1,1,1,2-tetrafluoroethane;
from 15% to 85% of 2,3,3,3-tetrafluoropropene, from 5% to 60% of 1,3,3,3-tetrafluoropropene and from 5% to 30% of 1,1-difluoroethane;
from 18% to 93% of 2,3,3,3-tetrafluoropropene, from 5% to 80% of 1,1,1,2-tetrafluoroethane and from 2% to 50% of 1,1-difluoroethane; and
from 15% to 60% of 1,3,3,3-tetrafluoropropene, from 20% to 82% of 1,1,1,2-tetrafluoroethane and from 3% to 20% of 1,1-difluoroethane.
6. The process as claimed in claim 1 , wherein the substitute heat transfer fluid comprises, a mixture selected from the group consisting of:
a mixture consisting of 2,3,3,3-tetrafluoropropene and 1,1,1,2-tetrafluoroethane;
a mixture consisting of 2,3,3,3-tetrafluoropropene, 1,1,1,2-tetrafluoroethane and 1,1-difluoroethane; and
a mixture consisting of 1,3,3,3-tetrafluoropropene, 1,1,1,2-tetrafluoroethane and 1,1-difluoroethane.
7. The process as claimed in claim 1 , wherein the substitute heat transfer fluid comprises a mixture consisting of 2,3,3,3-tetrafluoropropene and 1,1,1,2-tetrafluoroethane.
8. The process as claimed in claim 1 , wherein the substitute heat transfer fluid comprises a mixture consisting of 2,3,3,3-tetrafluoropropene, 1,1,1,2-tetrafluoroethane and 1,1-difluoroethane.
9. The process as claimed in claim 1 , wherein the substitute heat transfer fluid comprises a mixture consisting of 1,3,3,3-tetrafluoropropene, 1,1,1,2-tetrafluoroethane and 1,1-difluoroethane.
10. 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 a mixture selected from the group consisting of:
a mixture consisting of from 2% to 50% of 2,3,3,3-tetrafluoropropene and from 50% to 98% of 1,1,1,2-tetrafluoroethane;
a mixture consisting of from 18% to 93% of 2,3,3,3-tetrafluoropropene, from 5% to 80% of 1,1,1,2-tetrafluoroethane and from 2% to 50% of 1,1-difluoroethane; and
a mixture consisting of from 15% to 60% of 1,3,3,3-tetrafluoropropene, from 20% to 82% of 1,1,1,2-tetrafluoroethane and from 3% to 20% of 1,1-difluoroethane.
11. The process as claimed in claim 10 , wherein the substitute heat transfer fluid comprises a mixture selected from the group consisting of:
a mixture consisting of from 2% to 30% of 2,3,3,3-tetrafluoropropene and from 70% to 98% of 1,1,1,2-tetrafluoroethane;
a mixture consisting of from 5% to 40% of 2,3,3,3-tetrafluoropropene and from 60% to 95% of 1,1,1,2-tetrafluoroethane;
a mixture consisting of from 20% to 93% of 2,3,3,3-tetrafluoropropene, from 5% to 60% of 1,1,1,2-tetrafluoroethane and from 2% to 30% of 1,1-difluoroethane;
a mixture consisting of from 13% to 93% of 2,3,3,3-tetrafluoropropene, from 5% to 60% of 1,1,1,2-tetrafluoroethane and from 2% to 30% of 1,1-difluoroethane;
a mixture consisting of from 15% to 50% of 1,3,3,3-tetrafluoropropene, from 35% to 82% of 1,1,1,2-tetrafluoroethane and from 3% to 15% of 1,1-difluoroethane; and
a mixture consisting of from 10% to 40% of 1,3,3,3-tetrafluoropropene, from 45% to 87% of 1,1,1,2-tetrafluoroethane and from 3% to 15% of 1,1-difluoroethane.
12. The process as claimed in claim 10 , wherein the substitute heat transfer fluid comprises a mixture consisting of from 2% to 50% of 2,3,3,3-tetrafluoropropene and from 50% to 98% of 1,1,1,2-tetrafluoroethane.
13. The process as claimed in claim 10 , wherein the substitute heat transfer fluid comprises a mixture consisting off from 18% to 93% of 2,3,3,3-tetrafluoropropene, from 5% to 80% of 1,1,1,2-tetrafluoroethane and from 2% to 50% of 1,1-difluoroethane.
14. The process as claimed in claim 10 , wherein the substitute heat transfer fluid comprises a mixture consisting of from 15% to 60% of 1,3,3,3-tetrafluoropropene, from 20% to 82% of 1,1,1,2-tetrafluoroethane and from 3% to 20% of 1,1-difluoroethane.