Replacement refrigerant composition
AssigneeStar Refrigeration Limited
InventorStephen Forbes Pearson
Life of this patent
Estimating the term…
Abstract
A refrigerant composition for use in a vapour-compression refrigeration apparatus as a replacement for currently used refrigerants R22 and R12 comprises a mixture of pentafluoroethane (R125), tetrafluoroethane (R134a), a hydrocarbon selected from isobutane (R600a) and propane (R290), and optionally octafluoroethane (R218). The composition contains no chlorine atoms and is non-depleting to atmospheric ozone; but specific compositions have pressure-temperature relations substantially the same as R22 and R12 thereby allowing their use as direct replacements therefor in existing refrigeration apparatus.
Claims7
A refrigerant composition for use in a refrigeration apparatus which comprises a mixture of:
- (i) 1-50 wt % pentafluoroethane;
- (ii) 30-90 wt % tetrafluoroethane;
- and
- (iii) isobutane in an amount greater than zero and less than an amount which would make the mixture flammable.
A refrigerant composition for use as a replacement for refrigerant R22 in a refrigeration apparatus which comprises a mixture of:
- (i) 20 to 45 wt % pentafluoroethane;
- (ii) 45 to 70 wt % tetrafluoroethane;
- (iii) 2 to 8 wt % isobutane;
- and
- (iv) 5 to 10 wt % octafluoropropane.
A refrigerant composition for use as a replacement for refrigerant R12 in a refrigeration apparatus which comprises a mixture of:
- (i) 0.5 to 5 wt % pentafluoroethane;
- (ii) 75 to 98 wt % tetrafluoroethane;
- (iii) 1 to 6 wt % isobutane;
- and
- (iv) 6 to 15 wt % octofluoropropane.
Dependencies are inferred from the claim text.