Theoretical and experimental studies on boiling heat transfer for the zeotropic mixture R-407C
Autor(a) principal: | |
---|---|
Data de Publicação: | 2013 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFMG |
Texto Completo: | http://hdl.handle.net/1843/BUOS-9HZH35 |
Resumo: | This 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. |
id |
UFMG_063ceee3824f0cd0b3dcf49b6e2d380e |
---|---|
oai_identifier_str |
oai:repositorio.ufmg.br:1843/BUOS-9HZH35 |
network_acronym_str |
UFMG |
network_name_str |
Repositório Institucional da UFMG |
repository_id_str |
|
spelling |
Luiz MachadoCarlos F. M. CoimbraRicardo Nicolau Nassar KouryAntonio Augusto Torres MaiaCarlos Umberto da Silva LimaAntônio Carlos Lopes da CostaMatheus Pereira Porto2019-08-10T18:39:43Z2019-08-10T18:39:43Z2013-09-13http://hdl.handle.net/1843/BUOS-9HZH35This 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.Universidade Federal de Minas GeraisUFMGEngenharia mecânicaEngenharia MecânicaTheoretical and experimental studies on boiling heat transfer for the zeotropic mixture R-407Cinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/openAccessporreponame:Repositório Institucional da UFMGinstname:Universidade Federal de Minas Gerais (UFMG)instacron:UFMGORIGINALtese_doutorado_mpp.pdfapplication/pdf3030515https://repositorio.ufmg.br/bitstream/1843/BUOS-9HZH35/1/tese_doutorado_mpp.pdfb7275c062107e2ea0c0f43d85b3b7411MD51TEXTtese_doutorado_mpp.pdf.txttese_doutorado_mpp.pdf.txtExtracted texttext/plain124562https://repositorio.ufmg.br/bitstream/1843/BUOS-9HZH35/2/tese_doutorado_mpp.pdf.txtc7e0824c14461de40ab3f8450bb99da2MD521843/BUOS-9HZH352019-11-14 10:25:08.528oai:repositorio.ufmg.br:1843/BUOS-9HZH35Repositório de PublicaçõesPUBhttps://repositorio.ufmg.br/oaiopendoar:2019-11-14T13:25:08Repositório Institucional da UFMG - Universidade Federal de Minas Gerais (UFMG)false |
dc.title.pt_BR.fl_str_mv |
Theoretical and experimental studies on boiling heat transfer for the zeotropic mixture R-407C |
title |
Theoretical and experimental studies on boiling heat transfer for the zeotropic mixture R-407C |
spellingShingle |
Theoretical and experimental studies on boiling heat transfer for the zeotropic mixture R-407C Matheus Pereira Porto Engenharia Mecânica Engenharia mecânica |
title_short |
Theoretical and experimental studies on boiling heat transfer for the zeotropic mixture R-407C |
title_full |
Theoretical and experimental studies on boiling heat transfer for the zeotropic mixture R-407C |
title_fullStr |
Theoretical and experimental studies on boiling heat transfer for the zeotropic mixture R-407C |
title_full_unstemmed |
Theoretical and experimental studies on boiling heat transfer for the zeotropic mixture R-407C |
title_sort |
Theoretical and experimental studies on boiling heat transfer for the zeotropic mixture R-407C |
author |
Matheus Pereira Porto |
author_facet |
Matheus Pereira Porto |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Luiz Machado |
dc.contributor.advisor-co1.fl_str_mv |
Carlos F. M. Coimbra |
dc.contributor.referee1.fl_str_mv |
Ricardo Nicolau Nassar Koury |
dc.contributor.referee2.fl_str_mv |
Antonio Augusto Torres Maia |
dc.contributor.referee3.fl_str_mv |
Carlos Umberto da Silva Lima |
dc.contributor.referee4.fl_str_mv |
Antônio Carlos Lopes da Costa |
dc.contributor.author.fl_str_mv |
Matheus Pereira Porto |
contributor_str_mv |
Luiz Machado Carlos F. M. Coimbra Ricardo Nicolau Nassar Koury Antonio Augusto Torres Maia Carlos Umberto da Silva Lima Antônio Carlos Lopes da Costa |
dc.subject.por.fl_str_mv |
Engenharia Mecânica |
topic |
Engenharia Mecânica Engenharia mecânica |
dc.subject.other.pt_BR.fl_str_mv |
Engenharia mecânica |
description |
This 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. |
publishDate |
2013 |
dc.date.issued.fl_str_mv |
2013-09-13 |
dc.date.accessioned.fl_str_mv |
2019-08-10T18:39:43Z |
dc.date.available.fl_str_mv |
2019-08-10T18:39:43Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/1843/BUOS-9HZH35 |
url |
http://hdl.handle.net/1843/BUOS-9HZH35 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Universidade Federal de Minas Gerais |
dc.publisher.initials.fl_str_mv |
UFMG |
publisher.none.fl_str_mv |
Universidade Federal de Minas Gerais |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFMG instname:Universidade Federal de Minas Gerais (UFMG) instacron:UFMG |
instname_str |
Universidade Federal de Minas Gerais (UFMG) |
instacron_str |
UFMG |
institution |
UFMG |
reponame_str |
Repositório Institucional da UFMG |
collection |
Repositório Institucional da UFMG |
bitstream.url.fl_str_mv |
https://repositorio.ufmg.br/bitstream/1843/BUOS-9HZH35/1/tese_doutorado_mpp.pdf https://repositorio.ufmg.br/bitstream/1843/BUOS-9HZH35/2/tese_doutorado_mpp.pdf.txt |
bitstream.checksum.fl_str_mv |
b7275c062107e2ea0c0f43d85b3b7411 c7e0824c14461de40ab3f8450bb99da2 |
bitstream.checksumAlgorithm.fl_str_mv |
MD5 MD5 |
repository.name.fl_str_mv |
Repositório Institucional da UFMG - Universidade Federal de Minas Gerais (UFMG) |
repository.mail.fl_str_mv |
|
_version_ |
1803589292878987264 |