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| Format: | Artículo científico |
| Sprache: | en |
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Universidad Nacional de Colombia
2016
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| Online-Zugang: | https://www.redalyc.org/articulo.oa?id=49645153023 https://www.redalyc.org/journal/496/49645153023/ https://www.redalyc.org/journal/496/49645153023/html/ https://www.redalyc.org/journal/496/49645153023/49645153023.epub https://www.redalyc.org/journal/496/49645153023/movil |
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Inhaltsangabe:
- Analysis of working nanofluids for a refrigeration system Diana C. Hernández César Nieto-Londoño Zulamita Zapata-Benabithe Ingeniería Nanofluids Thermal efficiency Refrigeration system Heat tr ansfer coefficient This paper presents the analysis of nanorefrigerant fluids to i mprove the thermal efficiency of a refrigeration system. Simula tions in ANSYS FLUENT 15.0 were performed with m ixtures of refrigerants R113, R123 and R134a, with Al 2 O 3 nanoparticles at 1 vf% and 5 vf% (vf%, fraction volume concentration), flowing through a horizontal tu be with a constant wall temperature. A mixture and the k-e turbulent models were employed to obtain results of heat transfer coefficient, t emperature and pressure drop for each case. Results show an inc rement in thermal characteristics by adding 1 vf% and 5 vf% of Al 2 O 3 nanoparticles to the three refrigerants selected. However, the size of the nanoparticle does not affect the thermal properties of nanoflui d and the pressure drop does not show a specific pattern of beh avior at different concentrations of nanopa rticles. Finally, the mixture of R134a with 30 nm of mean diameter size Al 2 O 3 at 1 vf% was selected because of its higher thermal efficiency and its favorable prop erties as a refrigerant. 2016 artículo científico 0012-7353 https://www.redalyc.org/articulo.oa?id=49645153023 https://www.redalyc.org/journal/496/49645153023/ https://www.redalyc.org/journal/496/49645153023/html/ https://www.redalyc.org/journal/496/49645153023/49645153023.epub https://www.redalyc.org/journal/496/49645153023/movil en http://www.redalyc.org/revista.oa?id=496 Dyna application/pdf Universidad Nacional de Colombia Dyna (Colombia) Num.196 Vol.83