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Multicomponent refrigerant fluids for generating refrigeration, especially over a wide temperature range including cryogenic temperatures, which are advantageous over conventional refrigerant fluids especially for certain applications, and which are non-toxic, non-flammable and low or non-ozone-depl

Multicomponent refrigerant fluids for generating refrigeration, especially over a wide temperature range including cryogenic temperatures, which are advantageous over conventional refrigerant fluids especially for certain applications, and which are non-toxic, non-flammable and low or non-ozone-depleting and preferably are maintained in variable load form through compression, cooling, expansion and warming steps in a refrigeration cycle.

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1. A multicomponent refrigerant fluid comprising from 5 to 95 mole percent of at least one of pentafluorethane and perfluoropropane, and from 5 to 95 mole percent of at least one of perfluoropropoxymethane and pentafluoropropane and further comprising fluoroform in a concentration up to 25 mole perc

1. A multicomponent refrigerant fluid comprising from 5 to 95 mole percent of at least one of pentafluorethane and perfluoropropane, and from 5 to 95 mole percent of at least one of perfluoropropoxymethane and pentafluoropropane and further comprising fluoroform in a concentration up to 25 mole percent.2. A multicomponent refrigerant fluid comprising from 5 to 95 mole percent of at least one of pentafluoroethane and perfluoropropane, and from 5 to 95 mole percent of at least one of perfluoropropoxymethane and pentafluoropropane and further comprising tetrafluoromethane in a concentration of from 10 to 50 mole percent.3. A multicomponent refrigerant fluid comprising from 5 to 95 mole percent of at least one of pentafluoroethane and perfluoropropane, and from 5 to 95 mole percent of at least one of perfluoropropoxymethane and pentafluoropropane and further comprising argon in a concentration up to 40 mole percent.4. A multicomponent refrigerant fluid comprising from 5 to 95 mole percent of at least one of pentafluoroethane and perfluoropropane, and from 5 to 95 mole percent of at least one of perfluoropropoxymethane and pentafluoropropane and further comprising nitrogen in a concentration of from 10 to 80 mole percent.5. A multicomponent refrigerant fluid comprising from 5 to 95 mole percent of at least one of pentafluoroethane and perfluoropropane, and from 5 to 95 mole percent of at least one of perfluoropropoxymethane and pentafluoropropane and further comprising neon in a concentration up to 10 mole percent.6. A multicomponent refrigerant fluid comprising from 5 to 95 mole percent of at least one of pentafluoroethane and perfluoropropane, and from 5 to 95 mole percent of at least one of perfluoropropoxymethane and pentafluoropropane and further comprising helium in a concentration up to 10 mole percent.