Compatibility requirements for CFC alternatives

Spauschus, H. O.

doi:10.1016/0140-7007(90)90004-g

Cited by 7 publications

(2 citation statements)

References 2 publications

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“…Currently HCFC (hydrocMorofluorocarbon) -22, HCFC-123, HFC (hydrofluorocarbon) -125, HFC-134a, and the "Suva" blended (HFCF-22/HFC-152a/HCFC-124) are becoming commercially available for replacing the CFC refrigerants. However, the above tentative pure CFC substitutes (HCFC-22, may have one or more thermophysical shortcomings such as unsatisfactory cycle efficiency, high specific compressor displacement, Mgh minimum superheat of vapor, subatmospheric vapor pressure, poor heat-transfer capability, or poor oil compatibility as indicated by Spauschus (1990), Lee and Chao (1992), etc. Moreover, Lee and Chao (1992) reported that HFC-1243 and HFC-143a have com-parable thermophysical performances to the CFC refrigerants, but the fluids are flammable and may be poor in material compatibility.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic property predictions for refrigerant mixtures

Lee¹,

Sun²

1992

Ind. Eng. Chem. Res.

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The vapor-liquid equilibrium data of various refrigerant mixtures are correlated by the Soave, Patel-Teja, and Iwai-Margerum-Lu equations of state, respectively, with one adjustable binary interaction constant, ka12. The Patel-Teja equation is slightly better than others. A generalized equation for ka12 is, then, developed that enables the Patel-Teja equation to predict the equilibrium-phase properties for such mixtures within reasonable accuracy. With the aid of this model, the bubble and dew pressures are predicted for 55 binary non-chlorofluorocarbon (non-CFC) refrigerant mixtures containing HCFC-22, HFC-32, HCFC-123, HCFC-124, HFC-125, HFC-l34a, HCFC-l42b, HFC-l43a, HFC-l52a, HFC-1243, and dimethyl ether at temperatures from 233.15 to 363.15.K over the entire composition range. The prediction shows that the mixtures of HCFC-124/HCFC-l42b as well as HFC-l34a/dimethyl ether could work as near-azeotropic refrigerants.

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Section: Introductionmentioning

confidence: 99%