Theoretical and experimental studies on boiling heat transfer for the zeotropic mixture R-407C

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dc.creatorMatheus Pereira Porto
dc.date.accessioned2019-08-10T18:39:43Z
dc.date.accessioned2025-09-09T00:37:54Z
dc.date.available2019-08-10T18:39:43Z
dc.date.issued2013-09-13
dc.identifier.urihttps://hdl.handle.net/1843/BUOS-9HZH35
dc.languagePortuguês
dc.publisherUniversidade Federal de Minas Gerais
dc.rightsAcesso Aberto
dc.subjectEngenharia mecânica
dc.subject.otherEngenharia Mecânica
dc.titleTheoretical and experimental studies on boiling heat transfer for the zeotropic mixture R-407C
dc.typeTese de doutorado
local.contributor.advisor-co1Carlos F. M. Coimbra
local.contributor.advisor1Luiz Machado
local.contributor.referee1Ricardo Nicolau Nassar Koury
local.contributor.referee1Antonio Augusto Torres Maia
local.contributor.referee1Carlos Umberto da Silva Lima
local.contributor.referee1Antônio Carlos Lopes da Costa
local.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.
local.publisher.initialsUFMG

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