Refrigerant compositions and use thereof in low temperature refrigeration systems
View Patent ↗A refrigerant composition. The composition has 25 to 35 mass % difluoromethane, 20 to 40 mass % pentafluoroethane, and 35 to 45 mass % tetrafluoroethane. The composition exhibits a positive superheat at an evaporation temperature of about −30° F. There is also a process for producing refrigeration and a refrigeration system.
1. A refrigerant composition, comprising:
25 to 35 mass % difluoromethane,
20 to 40 mass % pentafluoroethane, and
35 to 45 mass % tetrafluoroethane,
wherein the composition exhibits a positive superheat not greater than about 8° F. at an evaporation temperature of about −30° F. at an outdoor temperature of 95° F.
2. The composition of claim 1 , wherein the composition is at least one selected from the group consisting of:
about 30 mass % difluoromethane, about 30 mass % pentafluoroethane, and about 40 mass % tetrafluoroethane;
about 25 mass % difluoromethane, about 35 mass % pentafluoroethane, and about 40 mass % tetrafluoroethane; and
about 35 mass % difluoromethane, about 25 mass % pentafluoroethane, and about 40 mass % tetrafluoroethane.
3. The composition of claim 1 , wherein the composition exhibits a superheat about 4° to about 8° F. at an evaporation temperature of about −30° F.
4. The composition of claim 3 , wherein the composition further exhibits a superheat of about 8° to about 16° F. at an evaporation temperature of about 15 to 30° F., and/or about 8° to about 12° F. at an evaporation temperature of about −15° F.
5. The composition of claim 1 , wherein the composition exhibits at least about 95% of one or more of the properties of chlorodifluoromethane selected from the group consisting of: cooling capacity, efficiency (COP), and mass flow.
6. A process for producing refrigeration, comprising condensing and evaporating a refrigerant composition, wherein the refrigerant composition comprises:
25 to 35 mass % difluoromethane,
20 to 40 mass % pentafluoroethane, and
35 to 45 mass % tetrafluoroethane, wherein the composition exhibits a positive superheat not greater than about 8° F. at an evaporation temperature of about −30° F. at an outdoor temperature of 95° F.
7. The process of claim 6 , wherein the composition is at least one selected from the group consisting of:
about 30 mass % difluoromethane, about 30 mass % pentafluoroethane, and about 40 mass % tetrafluoroethane;
about 25 mass % difluoromethane, about 35 mass % pentafluoroethane, and about 40 mass % tetrafluoroethane; and
about 35 mass % difluoromethane, about 25 mass % pentafluoroethane, and about 40 mass % tetrafluoroethane.
8. The system of claim 6 , wherein the composition exhibits a superheat of between about 4° to about 8° F. at an evaporation temperature of about −30° F.
9. The process of claim 8 , wherein the composition further exhibits a superheat of about 8° to about 16° F. at an evaporation temperature of about 15 to 30° F., and/or about 8° to about 12° F. at an evaporation temperature of about −15° F.
10. The process of claim 6 , wherein the composition exhibits at least about 95% of one or more of the properties of chiorodifluoromethane selected from the group consisting of: cooling capacity, efficiency (COP), and mass flow.
11. A refrigerant system, comprising a condenser, an evaporator, and a refrigerant composition, wherein said refrigerant composition comprises:
25 to 35 mass % difluoromethane;
20 to 40 mass % pentafluoroethane; and
35 to 45 mass % tetrafluoroethane, wherein the refrigerant composition exhibits a positive superheat not greater than about 8° F. at an evaporation temperature of about −30° F. in the refrigeration system at an outdoor temperature of 95° F.
12. The system of claim 11 , wherein the refrigerant composition is at least one selected from the group consisting of:
about 30 mass % difluoromethane, about 30 mass % pentafluoroethane, and about 40 mass % tetrafluoroethane;
about 25 mass % difluoromethane, about 35 mass % pentafluoroethane, and about 40 mass % tetrafluoroethane; and
about 35 mass % difluoromethane, about 25 mass % pentafluoroethane, and about 40 mass % tetrafluoroethane.
13. The system of claim 11 , wherein the refrigerant composition exhibits a superheat of about 4° to about 8° F. at an evaporation temperature of about −30° F.
14. The system of claim 13 , wherein the refrigerant composition further exhibits a superheat of about 8° to about 16° F. at an evaporation temperature of about 15 to 30° F., and/or about 8° to about 12° F. at an evaporation temperature of about −15° F.
15. The system of claim 11 , wherein the refrigerant composition exhibits at least about 95% of one or more of the properties of chlorodifluoromethane selected from the group consisting of: cooling capacity, efficiency (COP), and mass flow.