Thermal performance analysis of Al2O3/R-134a nanorefrigerant

Mahbubul, I.M. and Saadah, A. and Saidur, R. and Khairul, M.A. and Kamyar, A. (2015) Thermal performance analysis of Al2O3/R-134a nanorefrigerant. International Journal of Heat and Mass Transfer, 85. pp. 1034-1040. ISSN 0017-9310, DOI

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Nowadays, nanofluids are being considered as an efficient heat transfer fluid in various thermal applications. Refrigerant-based nanofluids, termed as "nanorefrigerants", have the potential to improve the heat transfer performances of refrigeration and air-conditioning systems. This study analyzed the thermophysical properties and their effects on the coefficient of performance (COP) resulted by addition of 5 vol. Al2O3 nanoparticles into R-134a refrigerant at temperatures of 283-308 K. The analysis has been done for a uniform mass flux through a horizontal smooth tube using established correlations. The results indicate that the thermal conductivity, dynamic viscosity, and density of Al2O3/R-134a nanorefrigerant increased about 28.58, 13.68, and 11, respectively compared to the base refrigerant (R-134a) for the same temperature. On the other hand, specific heat of nanorefrigerant is slightly lower than that of R-134a. Moreover, Al2O3/R-134a nanorefrigerant shows the highest COP of 15, 3.2, and 2.6 for thermal conductivity, density, and specific heat, respectively compared to R-134a refrigerant. Therefore, application of nanoparticles in refrigeration and air-conditioning systems is promising to improve the performances of the systems. (C) 2015 Elsevier Ltd. All rights reserved.

Item Type: Article
Funders: University of Malaya under the High Impact Research MoE UM.C/625/1/HIR/MoE/ENG/40 , Ministry of Education Malaysia D000040-16001
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Uncontrolled Keywords: Nanofluid, thermal conductivity, viscosity, density, specific heat, coefficient of performance, refrigerant-based nanofluid, pressure-drop characteristics, heat-transfer characteristics, al2o3/r141b nanorefrigerant, nanoparticles, conductivity, viscosity, tube, migration, system,
Subjects: T Technology > T Technology (General)
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering
Depositing User: Mr Jenal S
Date Deposited: 14 Apr 2016 06:58
Last Modified: 16 Jul 2019 05:37

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