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http://hdl.handle.net/1843/BUOS-9HZH35| Tipo: | Tese de Doutorado |
| Título: | Theoretical and experimental studies on boiling heat transfer for the zeotropic mixture R-407C |
| Autor(es): | Matheus Pereira Porto |
| primer Tutor: | Luiz Machado |
| primer Co-tutor: | Carlos F. M. Coimbra |
| primer miembro del tribunal : | Ricardo Nicolau Nassar Koury |
| Segundo miembro del tribunal: | Antonio Augusto Torres Maia |
| Tercer miembro del tribunal: | Carlos Umberto da Silva Lima |
| Cuarto miembro del tribunal: | Antônio Carlos Lopes da Costa |
| Resumen: | 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. |
| Asunto: | Engenharia mecânica |
| Idioma: | Português |
| Editor: | Universidade Federal de Minas Gerais |
| Sigla da Institución: | UFMG |
| Tipo de acceso: | Acesso Aberto |
| URI: | http://hdl.handle.net/1843/BUOS-9HZH35 |
| Fecha del documento: | 13-sep-2013 |
| Aparece en las colecciones: | Teses de Doutorado |
archivos asociados a este elemento:
| archivo | Descripción | Tamaño | Formato | |
|---|---|---|---|---|
| tese_doutorado_mpp.pdf | 2.96 MB | Adobe PDF | Visualizar/Abrir |
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