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US 7,582,223 B2Granted
Refrigerant composition for refrigeration systems
AssigneeIndian Institute of Technology
InventorVenkatarathanam Gandhiraju
Life of this patent
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Abstract
The present invention relates to a method of refrigeration using refrigerant composition for multistage refrigeration systems, such as a pre-cooled mixed refrigeration system with one or more phase separators. The refrigerant composition can include nitrogen; methane; ethane, ethylene, or combinations thereof; propane, n-butane, iso-butane, or combinations thereof; and neon, helium, or combinations thereof.
Claims6
A method of refrigeration, comprising:
- (a) providing a precooled multistage mixed refrigeration system comprising a compressor, an oil separator for separation of entrained oil from the refrigerant, and one or more refrigerant phase separators for separation of the liquid and vapor phases of the refrigerant;
- and
- (b) operating the refrigeration system with a refrigerant composition comprising:
- more than 36 molar percent but less than 60 molar percent of nitrogen,
- 15 to 40 molar percent of methane,
- 5 to 30 molar percent of ethane, ethylene or combinations thereof,
- up to 20 molar percent of propane, n-butane, iso-butane and combinations thereof, and
- up to 20 molar percent of neon, helium and combinations thereof;
- wherein the refrigerant comprises at least one of iso-butane, neon, or helium.
6 more elements
Dependencies are inferred from the claim text.