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Please use this identifier to cite or link to this item: http://hdl.handle.net/1843/BUOS-9HZH35
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dc.contributor.advisor1Luiz Machadopt_BR
dc.contributor.advisor-co1Carlos F. M. Coimbrapt_BR
dc.contributor.referee1Ricardo Nicolau Nassar Kourypt_BR
dc.contributor.referee2Antonio Augusto Torres Maiapt_BR
dc.contributor.referee3Carlos Umberto da Silva Limapt_BR
dc.contributor.referee4Antônio Carlos Lopes da Costapt_BR
dc.creatorMatheus Pereira Portopt_BR
dc.date.accessioned2019-08-10T18:39:43Z-
dc.date.available2019-08-10T18:39:43Z-
dc.date.issued2013-09-13pt_BR
dc.identifier.urihttp://hdl.handle.net/1843/BUOS-9HZH35-
dc.description.resumoThis work concerns theorical and experimental methods for understanding the heat transfer mechanisms for a zeotropic fluid, namely R-407C. The refrigerant R-407C is a mixture of three refrigerants, R-134a, R-32, and R-125, which may replace R-22 in future refrigerant systems. Due to the degradation of heat transfer coefficients in mixtures such as R-407C, the classical relations may overestimate the experimental heat transfer rates. A correction based on nucleate boiling suppression factors that corrects a previously proposed relation is used to minimize the degradation error. The newly proposed relation was developed through a robust methodology based on genetic algorithm (GA) optimization for three additional refrigerants R-404a, R134a and R-22. A discussion about inventory is also presented, where a modified Otaki method is proposed for the more realistic scenario that corresponds of not knowing a priori the heat transfer coefficient. The inventory obtained by the modified Otaki method is higher than the one obtained by the traditional Otaki method. Both methods yield accurate results for R-407C.pt_BR
dc.languagePortuguêspt_BR
dc.publisherUniversidade Federal de Minas Geraispt_BR
dc.publisher.initialsUFMGpt_BR
dc.rightsAcesso Abertopt_BR
dc.subjectEngenharia Mecânicapt_BR
dc.subject.otherEngenharia mecânicapt_BR
dc.titleTheoretical and experimental studies on boiling heat transfer for the zeotropic mixture R-407Cpt_BR
dc.typeTese de Doutoradopt_BR
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