R22 replacement refrigerant
AssigneeNational Refrigerants, Inc.
InventorRobert Yost
Life of this patent
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Abstract
Refrigerant compositions are disclosed which includes (a) 57-59 total wt % pentafluoroethane (R125); (b) 38-41 total wt % 1,1,1,2-tetrafluoroethane (R134a); and (c) 2.5-2.9 total wt % isobutane. More preferably, the invention is a refrigerant formulation containing a nominal composition consisting of 58.0% R125, 39.3% R134a and 2.7% R600a, subject only to the normal variations in concentrations experienced with charging and mixing refrigerants.
Claims14
A refrigerant composition exhibiting a nominal composition which comprises:
- (a) 57-59 total wt % pentafluoroethane (R125);
- (b) 38-41 total wt % 1,1,1,2-tetrafluoroethane (R134a);
- and (c) 2.5-3.0 total wt % isobutane (R600a).
A method for upgrading an existing R22 refrigeration unit using a mineral oil lubricant to eliminate the R22 refrigerant by a method that comprises:
- replacing said R22 refrigerant from said refrigeration unit with a refrigerant formulation with a nominal composition consisting of (a) 57-59 total wt % pentafluoroethane (R125);
- (b) 38-41 total wt % 1,1,1,2-tetrafluoroethane (R134a);
- and (c) 2.5-3.0 total wt % isobutane (R600a).
Dependencies are inferred from the claim text.