COOLING COMPOSITION FOR CENTRAL GAS DIRECTORS

摘要

A refrigerant composition which is suitable as a substitute for conventional refrigerant R12 in a vapour compression system employing a centrifugal compressor, comprises a mixture of tetraflouroethane and at least one additional refrigerant. The refrigerant mixture has a vapour density which renders it suitable for use as an R12 replacement in a centrifugal compression refrigeration system. The molecular weight of the mixture approximates 121. Preferred mixtures include 67 wt. % tetraflouroethane and 33 wt. % octafluoropropane; 69 wt. % tetrafluoroethane and 31 wt. % octafluorocyclobutane; and 66 wt. % tetrafluoroethane and 34 wt. % heptafluoropropane. Refrigeration effect and coefficient of performance are similar to R12.