HEAT TRANSFER COMPOSITIONS, METHODS, AND SYSTEMS
The present invention relates to a refrigerant composition comprising at least about 98.5% by weight of the following three compounds, with each compound being present in the following relative percentages: 33.0% to 45% by weight difluoromethane (HFC-32); 48.5% to 67.0% by weight of 2,3,3,3-tetrafluoropropene (HFO-1234yf); and 1.0% to 6.0% by weight fluoroethane (HFC-161), and to the use of the refrigerant in a heat exchange system, including air conditioning, refrigeration applications and heat pump applications and to the use of such compositions as a replacement of the refrigerant R-410A or R-32 or R-454B for heating and cooling applications.
1 . A refrigerant comprising at least about 98.5% by weight of the following three compounds, with each compound being present in the following relative percentages:
33.0% to 43.5% by weight difluoromethane (HFC-32);
48.5% to 67.0% by weight of 2,3,3,3-tetrafluoropropene (HFO-1234yf); and
1.0% to 6.0% by weight fluoroethane (HFC-161).
2 . The refrigerant of claim 1 , wherein the refrigerant is a Class 2L refrigerant, has a GWP of less than 300 and has an evaporator glide of 4° C. or less.
3 . The refrigerant of claim 1 comprising at least about 98.5% by weight of the following three compounds, with each compound being present in the following relative percentages:
from 40% to 45% by weight HFC-32;
from 50% to 55% by weight of HFO-1234yf; and
from 1.0% to 6.0% by weight fluoroethane HFC-161.
4 . A refrigerant consisting essentially of the following three compounds, with each compound being present in the following relative percentages:
from 40% to 45% by weight HFC-32;
from 49% to 55% by weight of HFO-1234yf; and
from 1.0% to 6.0% by weight of HFC-161.
5 . The refrigerant of claim 4 consisting essentially of the following three compounds, with each compound being present in the following relative percentages:
from 41.5% to 44.5% by weight HFC-32;
from 49.5% to 53.5% by weight of HFO-1234yf; and
from 2.0% to 6.0% by weight of HFC-161.
6 . The refrigerant of claim 4 consisting essentially of the following three compounds, with each compound being present in the following relative percentages:
from 43.5% +0.5/-2% by weight HFC-32;
from 52.5% +⅟-2% by weight of HFO-1234yf; and
from 4% +⅟-2% by weight of HFC-161.
7 . The refrigerant of claim 4 consisting of the following three compounds, with each compound being present in the following relative percentages:
from 43.5% +0.5/-2% by weight HFC-32;
from 52.5% +⅟-2% by weight of HFO-1234yf; and
from 4% +⅟-2% by weight of HFC-161.
8 . The refrigerant of claim 4 , wherein the refrigerant is a Class 2L refrigerant, has a GWP of less than 300 and has an evaporator glide of less than 5° C.
9 . The refrigerant of claim 4 , wherein the refrigerant is a Class 2L refrigerant, has a GWP of less than 300 and has an evaporator glide of less than 4° C.
10 . The refrigerant of claim 4 , wherein the refrigerant is a Class 2L refrigerant, has a GWP of less than 300 and has an evaporator glide of less than 4° C.
11 . A heat transfer composition comprising the refrigerant of claim 10 and at least one lubricant.
12 . The heat transfer composition of claim 11 wherein said at least one lubricant is selected from POE and PVE.
13 . The heat transfer composition of claim 11 wherein said at least one lubricant comprises POE.
14 . The heat transfer composition of claim 11 wherein said at least one lubricant comprises PVE.
15 . A heat transfer composition comprising a refrigerant according to claim 4 .
16 . A heat transfer system comprising a compressor, and evaporator and a condenser and containing a refrigerant according to claim 4 .
17 . A heat transfer system comprising a compressor, and evaporator and a condenser and containing a heat transfer composition according to claim 12 .
18 . A heat transfer system according to claim 17 wherein said heat transfer system comprises one or more of residential air conditioning, commercial air conditioning, chillers, residential air-to-water heat pump hydronic systems, medium temperature refrigeration and low temperature refrigeration.
19 . A heat transfer system according to claim 18 wherein said heat transfer system is an air conditioning system.
20 . A heat transfer system according to claim 18 wherein said heat transfer system is a heat pump.