Experimental study of nanofluid effects on heat transfer in closed cycle system in shell and tube heat exchangers at Isfahan power plant

Document Type : Research Paper

Authors

1 Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran

2 Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran

Abstract

The present study investigated the effect of distilled-water/ silver nanofluid on heat transfer in a closed cooling system of one of the electrical energy generation units at Isfahan power plant. The difference between this study and previous researches refers to silver properties which have a high thermal conductivity and is non-toxic, hydrophilic and eco-friendly. Distilled water/ silver nanofluid with 20 nm average diameter and 0.1% volume fraction was purchased from Iranian nanomaterials’ Pishgaman company. The volume fractions 0.01%, 0.025%, 0.05%, 0.075% were prepared in the laboratory and thermophysical properties were practically measured in the laboratory. Nanofluids with flow rates from 0.14 to 0.26 kg/s and volume fraction from 0.01% to 0.1% passed through the tubes of heat exchanger and were evaluated in the Reynolds number range of 1500 to 4000. This study was aimed to achieve the overall heat transfer coefficients and pressure drop of the system. According to the system performance index, the results showed that nanofluid can be used to increase the efficiency of heat exchangers and, as an appropriate method, to reduce the dimensions of the exchangers. The results showed that nanofluid increased heat transfer coefficient by 16%. Pressure drop of nanofluid, however, have no significant change compared with the pressure drop of pure water.

Keywords

References

[1] Farajollahi B., Etemad S.Gh., Hojjat M.,  Heat Transfer of Nanofluids in a Shell and Tube Heat Exchanger, International Journal of Heat and Mass Transfer (2010) 53: 12–1,.
[2] Seifi Jamnani M., Hoseini S.M., Hashemabadi S.H.,  PeyGhambarzad S.M., Experimental Study of Al2O3/Water Nano-Fluid Flow Heat Transfer Through the Elliptical Tubes, ICHEC13, Kermanshah- Iran (2010).
[3] Peyghambarzadeh SM., Hashemabadi SH., Seifi Jamnani M., Hoseini SM.Improving the Cooling Performance of Automobile Radiator with Al2O3/ Water Nanofluid, Applied Thermal Engineering (2011)31:1833–8.
[4] Zamzamian A., Oskouie SN., Doosthoseini A., Joneidi A., Pazouki  M., Experimental Investigation of  Forced Convective Heat Transfer Coefficient in Nanofluids of  Al2O3/EG and CuO/ EG in a double pipe and plate heat Exchangers under Turbulent Flow, Experimental Thermal and Fluid Science (2011) 35(3):495–502.
[5] Godson Asirvatham L., Raja B., Lal DM., Wongwises S.,  Convective Heat Transfer of Nanofluids with Correlations. Particuology (2011) 9:626–31.
[6] Patel S., Patel V., Thakkar V., Experimental Investigation of Diameter Effect of Al2O3 Nano Fuid on Shell and Tube Heat Exchanger in Laminar Flow Regime (2015) 2(5): Online ISSN: 2393-9877, Print ISSN: 2394-2444.
[7] Dharun Arvind R., Heat Transfer Analysis Of Shell And Tube Heat Exchanger Using Aluminium Nitride / Water Nanofluid", International Journal on Applications in Mechanical and Production Engineering (2015) 1: 13-15.
[8] Amani J., AbbasianArani A.A., Experimental Investigation of Diameter Effect on Heat Transfer Performance and Pressure Drop of TiO2 Water Nano Fluid, Experimental Thermal and Fluid Science (2013) 44: 520-533.
[9] Godson L., Deepak K., Enoch C., Heat Transfer Characteristics of Silver/Water Nano Fluids  in  a  Shell  and  Tube  Heat Exchanger, Archives of Civil and Mechanical Engineering (2014) 14: 489-496.
[10] Afshoon Y., Fakhar A., Numerical Study of Improvement in Heat Transfer Coefficient of Cu-O Water Nanofluid in the Shell and Tube Heat Exchangers, Biosciences Biotechnology Research Asia (2014) 11(2): 739-747.
[11] Baghmisheh Gh., Moradzadeh M., Hedayatzadeh S., Dorosti R., Industrial Heat Exchanger Design with ASPEN B-JAC (2007) 67-90.
[12] Taylor J.R., An Introduction to Error Analysis, The Study of Uncertainties  of Physical Measurements. University Science Books (1982).
[13] Bork P.V., Grote H., Notz D., Regler M., Data Analysis Techniques in High Energy Physics Experiments. Cambridge University Press (1993).
[14] Akhavan-Behabadi M.A., Mohseni S.G., Najafi H., Ramazanzadeh H. Heat Transfer and Pressure Drop Characteristics of Forced Convective evaporation in horizontal tubes with Coiled Wire Inserts, International Communications in Heat and Mass Transfer.
Energy Equipment and Systems
Volume 4, Issue 2
December 2016
Pages 95-109

Files

Share

How to cite

Statistics