Leong, K.Y. and Saidur, Rahman and Mahlia, T.M.I. and Yau, Y.H. (2012) Performance investigation of nanofluids as working fluid in a thermosyphon air preheater. International Communications in Heat and Mass Transfer, 39 (4). pp. 523-529. ISSN 07351933, DOI https://doi.org/10.1016/j.icheatmasstransfer.2012.01.014.
Full text not available from this repository.Abstract
In recent years, there has been a substantial increase in energy demand due to industrialization development. This raises concern on issues such as depletion of fossil based energy and emission of green house gasses. Hence, optimization of energy use through the thermosyphon air preheater is one of the possible approaches to address this problem. It can be used to recover and transmit the heat from the hot air (flue gas) to the cold air used for combustion process in a boiler. This study focuses on the analytical analysis of the thermal performance of a thermosyphon operated with water and nanofluids. The thermo physical properties of the selected nanofluids and relevant formulations are taken from the literatures to perform the analysis. Study found that change of nanofluid properties such as thermal conductivity only plays minor role in enhancing the thermal performance of the thermosyphon. The study implied that the hot air velocity is capable of increasing the efficiency of a thermosyphon. It is found that 23 overall heat transfer enhancement is observed when the hot air velocity increases from 2.0. m/s to 4.75. m/s for water based (7) alumina and (4) titanium dioxide nanofluids.
| Item Type: | Article |
|---|---|
| Funders: | UNSPECIFIED |
| Additional Information: | Export Date: 6 December 2012 Source: Scopus CODEN: IHMTD Language of Original Document: English Correspondence Address: Leong, K.Y.; Department of Mechanical Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia; email: leongkinyuen@gmail.com References: Saidur, R., Abdelaziz, E.A., Mekhilef, S., A review on energy saving strategies in industrial sector (2011) Renewable and Sustainable Energy Reviews, 15 (1), pp. 150-168; Saidur, R., Ahamed, J.U., Masjuki, H.H., Energy, exergy and economic analysis of industrial boilers (2010) Energy Policy, 38 (5), pp. 2188-2197; Liu, D., Tang, G.F., Zhao, F.Y., Wang, H.Q., Modeling and experimental investigation of looped separate heat pipe as waste heat recovery facility (2006) Applied Thermal Engineering, 26 (17-18), pp. 2433-2441; Murshed, S.M.S., Leong, K.C., Yang, C., Enhanced thermal conductivity of TiO 2-water based nanofluids (2005) International Journal of Thermal Sciences, 44 (4), pp. 367-373; Murshed, S.M.S., Leong, K.C., Yang, C., Investigations of thermal conductivity and viscosity of nanofluids (2008) International Journal of Thermal Sciences, 47 (5), pp. 560-568; 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| Uncontrolled Keywords: | Air-preheater, Heat exchanger, Nanofluids, Thermosyphon, Analytical analysis, Cold air, Combustion pro-cess, Energy demands, Energy use, Heat Transfer enhancement, Hot air, Nano-fluid, Thermal Performance, Thermo-physical property, Thermosyphons, Water based, Working fluid, Air, Air preheaters, Alumina, Capillary flow, Energy management, Flue gases, Greenhouse gases, Heat exchangers, Mixed convection, Siphons, Thermal conductivity, Titanium dioxide, Nanofluidics. |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering |
| Divisions: | Faculty of Engineering |
| Depositing User: | Mr Jenal S |
| Date Deposited: | 03 Jul 2013 03:43 |
| Last Modified: | 25 Oct 2019 06:22 |
| URI: | http://eprints.um.edu.my/id/eprint/6559 |
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