Heat transfer performance of silver/water nanofluid in a solar flat-plate collector

Yıl 2015, Cilt: 1 Sayı: 2, 104 - 112, 01.02.2015

Godson Lazarus Siddharth Roy Deepak Kunhappan Enoch Cephas Somchai Wongwises

https://doi.org/10.18186/jte.29475

Cited By: 28

Öz

An experimental study is carried out to investigate the heat transfer characteristics of silver/water nanofluid in a solar flatplate collector. The solar radiation heat flux varies between 800 W/m2and 1000W/m2, and the particle concentration varies between 0.01%, 0.03%, and 0.04%. The fluid Reynolds number varies from 5000 to 25000. The influence of radiation heat flux, mass flow rate of nanofluid, inlet temperature into the solar collector, and volume concentration of the particle on the convective heat transfer coefficient and the collector efficiency are studied. Both parameters increase with increase in the particle volume concentration and flow rate. The maximum percentage increase obtained in the convective heat transfer coefficient is 18.4% for the 0.04% volume concentration at a Reynolds number of 25000. An increase in the performance of nanofluid is also witnessed when compared to the base fluid, which has a strong dependency on volume concentration and mass flow rate. MgO. The nanofluid achieved a 3°C temperature difference during the daytime peak solar radiation compared with the base fluids. With a concentration of 0.2% ZnO, a temperature difference of 2.55°C for daytime and 1°C for nighttime was reached, and this was determined to be the most attractive option for solar energy utilization. Yousefi et al. [15] witnessed a 28% performance improvement in a flat-plate collector when it was operated with water-Al2O nanofluids. Tyagi [16] theoretically compared the conventional flat-plate collector with a direct absorption solar collector (DAC) and observed the former to be 10% more efficient. Otanicar [17] studied the conomic and environmental influences of using nanofluids to enhance solar collector efficiency with conventional solar collectors. Dongxiao et al. [18] presented excellent photothermal properties of carbon-black aqueous nanofluids at highvolume fractions. Further work on nanofluids’ application to direct solar absorption has been carried out by Lijuan Mu [19] using a custom-made direct solar absorber. The radiative properties of several nanofluids are tested for the highest temperature difference across the heat exchangers. Based on the above-mentioned review of the literature, it has been clearly observed that most of the previous studies on solar flat-plate collectors were conducted using metal oxide nanoparticles in relatively high concentrations. These high concentrations of metal oxide nanoparticles cause a higher pressure drop that then requires a higher pumping power. Since a limited number of studies exists in the literature with respect to pure metal nanoparticles, it is recommended to study the heat transfer characteristics of pure metal nanoparticles with relatively low concentrations (<1%) by volume and high thermal conductivity compared with metal oxides. Therefore, in the present study, the efficiency of a solar flat-plate collector is studied with a low particle volume concentration of less than 0.04% silver-water nanofluid. These experiments are conducted for a solar radiation flux ranging from 800 W/m2 to 1000 W/m2, and the Reynolds number varying from 5000 to 25000. The effect of radiative heat flux, mass flow rate, inlet temperature, and volume concentration on the convective heat transfer coefficient and the collector efficiency are studied. The tailormade setup for a collector area is 2.4m2 and the collector plate is made of nine parallel copper strips

Anahtar Kelimeler

silver, nanoparticles, solar flat plate collector, convection, heat transfer

Heat transfer performance of silver/water nanofluid in a solar flat-plate collector

Öz

Anahtar Kelimeler

-

Kaynakça

• L.G.Asirvatham, Enhancement of heat transfer using nanofluids - An overview, Renewable and Sustainable Energy reviews,Chennai-629-641 (2009) Vol. 14.
• S.U.S Choi, Z.G.Zhang, W.Yu, Anomalous thermal conductivity enhancemnet in nanotube suspensions.: Applied Physics Lett, Vol. 79 (14) (2001) 2252.
• S.U.S Choi,Nanofluids: from vision to reality through research, Journal of Heat transfer, Vol. 131 (2009)3: 1- 9.
• S.U.S.Choi, Z.G.Zhang and P.Keblinski, Nanofluids, Encyclopedia of Nanoscience and Nanotechnology, Vol. 6.737-757.
• W.Yu, D. M France, J.L Routbort, and S.U. S. Choi, Review and comparison of nanofluid thermal conductiviy and heat trasnfer enhancements,Heat trasnfer Engineering, (2008) Vol. 29.5 432-460.
• T.Tyler,O.Shenderova,G.Cunningham,J.Walsh,J.Drobn ikand G.McGuire,Thermal transport properties of daimond based nanofluids and nanocomposites Diamond and realted materials, Vol. 15 (2006)11-12, 2078-2081.
• S.K.Das, S.U.S. Choi, and H.E. Patel Heat transfer in nanofluids - a reviewHeat transfer Engineering, Vol. 27 (2006) 10:3-19.
• M.S.Liu, M.C.C Lin, L.T.Huang and C.C Wang, Enhancement of thermal conductivity with carbon nanotube Communications in Heat and Mass transfer (2005) Vol. 32.1202-1210 International
• V.Kaufui, Wong, and Omar De Leon, Applications of Nanofluids: Current 519659,Advances in Mechanical Engineering, Vol. and 2010. Future, Article ID
• G.Donzelli, R.Cerbino and A.Vailati, Bistable heat transfer in a nanofluid, Article ID 104503, Physical Review Letters, 2009, Vol. 102.
• S.J.Kim, I.C.Bang, J.Buongiornio and I. W. Hu, Study of pool boiling and critical heat flux enhancement in nanofluids,Bulletin of the polish Academy of Sciences - Technical Sciences, Vol. 55.2 211-216,
• H.B.Ma, C Wilson, Q. Yu, K. Park, S.U.S.Choi, An experimental investigation of heat transport capability in a nanofluid oscillating heat pipe,Journal of Heat transfer, Vol. 128.11 1213-1216,
• Mahian et al, A review of applications of nanofluids in solar energy.International Journal of Heat and Mass Transfer 57 (2013) 582–594.
• Hua Qing Xie, Wei Yu, Jing Li,Yang Li,Investigation on Heat Transfer Performances of Nanofluids in Solar Collector,Materials Science Forum (Volume 694), Vol. Frontier of Nanoscience and Technology (2011) 33
• Tooraj Yousefi, Farzad Veysia, Ehsan Shojaeizadeha, Sirus Zinadinib. Kermanshah, An experimental investigation on the effect of Al2O3-H2O nanofluid on the efficiency of solar flat plate collectors, Iran Renewable Energy Journal (2011) Vol. 39 293- 298.
• H.Tyagi, P.Phelan, R.J.Prasher, Predicted efficiency of a low-temperature nanofluid based direct absorption solar collector, Sol Energy Eng (2009) 131:0410041e7
• Taylor A. Robert, Patrick E.Phelan, Todd P.Otanicar, Chad A.Walker, Monica Nguyen, Steven Trimble, Ravi Prasher,Applicability of nanofluids in high flux solar collectors. 023104-1, Tempe, Arizona : Journal of Renewable and Sustainbale energy (2011) Vol. 3.
• Dongxiao Han, Zhaoguo Meng, Daxiong Wu, Canying Zhang and Haitao Zhu, Thermal properties of carbon black aqueous, Nanoscale Research Letters (2011) 6:457
• Lijuan Mu, Qunzhi Zhu, Leilei Si, Radiative Properties of Nanofluids and Performance of a Direct Solar Absorber Using Nanofluids, Paper no. MNHMT2009- 18402 pp. 549-553 , Vols. ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer, Volume 1 (2009).
• ASHRAE Standard 86-93. Methods of testing to determine the thermal performance of solar collectors; 1986. Atlanta, GA, USA.
• B.C Pak, Y.I Cho,Hyrodynamic and heat transfer study of dispersed fluids withsub micron metallic oxide particles,Exp. Heat Transfer 11(1998) 151.
• W.Yu ,S.U.S Choi,The role of interfacial layers in the enhanced thermal conductivity of nanofluids; a renovated Maxwell model .J.Nanoparticles res 5 (2003) p.167.
• D.A Drew, S.L PassmanTheory of multicomponent fluids, Springer Berlin (1999).
• Y.Xuan. W.Roetzel, Conceptions for heat transfer correlation of nanofluids, Int.J. Heat Mass Transfer 43 (2000) 3701.
• Robert J. Moffat, Describing the Uncertainties in
• Experimental Results, Experimental Thermal and Fluid Science 1988; 1:3-17.
• P.W.Dittus, and L. M. K. Boelter, Heat transfer in automobile radiators of the tubular type Univ. Calif.Pub. Eng., Vol. 2, No. 13, pp. 443-461 (1930), reprinted in Int. Comm. Heat Mass Transfer, Vol. 12 (1985) pp. 3-22.
• H.C.Hottel, W.Whillier, Evaluation of flat plate solar collector performance. Trans. Conf. Use of Solar Energy Thermal Processes. Tuscon AZ.(1955).
• R.W.Bliss, The derivation of several “plate efficiency factors” useful in the design of the flat plate solar heat collector. Solar Energy. Vol 4 (1959) pp55-64.