In this study, thermodynamic performance of supplementary/retrofit refrigerant mixtures for CFC12 used in existing automobile air-conditioners was examined. A thermodynamic computer analysis of an automobile air-conditioner was carried out for the initial screening of possible mixture candidates, and refrigerant mixtures composed of HCFC22, HFC134a, HCFC142b, RE170 (dimethylether), HC290 (propane), and HC600a (iso-butane) were proposed to supplement CFC12. Also a breadboard type refrigeration test facility was manufactured to verify the perfomance of the alternative refrigerant mixtures proposed through the computer analysis. Test results showed that HFC134a/RE170 mixture with zero ozone depletion potential is the best long term candidate to supplement CFC12. On the other hand, HCFC22/HFC134a/RE170 and HCFC22/HFC134a/HCFC142b mixtures are good only as short term supplementary/retrofit alternatives since they contain HCFC22. A hydrocarbon mixture of HC290/HC600a showed a good performance but its use in existing automobile air-conditioners should be carefully considered due to its flammability.
Evaluation of supplementary/retrofit refrigerants for automobile air-conditioners charged with CFC12
International Journal of Refrigeration ; 22 , 7 ; 558-568
1999
11 Seiten, 8 Bilder, 5 Tabellen, 17 Quellen
Aufsatz (Zeitschrift)
Englisch
Computer-Anwendung , Druckabhängigkeit , Entropie , Erwärmung , Fahrzeugaggregat , homogene Mischung , Kältemittel , Klimagerät , Modellsimulation , numerisches Verfahren , Substitutionsstoff , Temperaturabhängigkeit , thermodynamische Eigenschaft , Versuchsanordnung , Versuchsbeschreibung , Wärmeübertragung , Ersatzkältemittel
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