Experimental Investigation of The Performance of CuO - Graphene Nanoplatelet / Water Hybrid Nanofluid in Concentric Tube Heat Exchanger

Yıl 2021, Cilt: 6 Sayı: 1, 37 - 52, 29.06.2021

Yetkin Şen , Halil Variyenli

Öz

In recent years, the need for energy has been increasing, but fossil fuels, which have the largest share in energy production, are gradually decreasing. In order to meet this need, the efficiency of existing systems should be increased. Studies have focused on testing nanofluids in order to increase the efficiency of heat exchangers used in heating and cooling systems applications in many places such as industry, residences, workplaces, etc. In this paper, the effect of hybrid nanofluid consisting of CuO & graphene nanoplatelet / distilled water on the thermal performance of the concentric tube heat exchanger was experimentally investigated. As a result of the experiments it was observed that, if hybrid nanofluid is used instead of water as a hot fluid in the system, an average of 5.5% improvement in overall heat transfer coefficient has been achieved. It was found that the total exergy loss was reduced by an average of 55%. It will be advantageous to use the heat exchanger with increased efficiency, both in terms of cost and in terms of CO2 emission, thanks to less fuel consumption. By increasing the efficiency with nanofluids, it will be possible to design more compact and light heat exchangers in the future.

Anahtar Kelimeler

Hybrid nanofluid, Concentric tube heat exchanger, Heat transfer enhancement, Parallel flow

Kaynakça

• [1] Turkoglu, S., P., Kardogan, P. “The Role and Importance of Energy Efficiency for Sustainable Development of the Countries”, 3rd International Sustainable Buildings Symposium (ISBS) United Arab Emirates, 2017, 53-60.
• [2] Kanojiya, N., Kriplani, V., Walke, P. “Heat Transfer Enhancement in Heat Exchangers With Inserts: A Review”, International Journal of Engineering Research & Technology 2014: 3(10).
• [3] Monjurul Ehsan, M., Noor, S., Salehin, S., Sadrul Islam, A. “Application of Nanofluid in Heat Exchangers for Energy Savings”, Thermofluid Modeling for Energy Efficiency Applications, Academic Press, 2016,73-101.
• [4] Alosious, S., R, S., Nair, A. and Krishnakumar, K. (2017). Experimental and numerical study on heat transfer enhancement of flat tube radiator using Al2O3 and CuO nanofluids. Heat and Mass Transfer, 53(12), 3545-3563.
• [5] Bin-Abdun, N., Razlan, Z., Shahriman, A., Voon, C., Wan, W., Zunaidi, I., Albzeirat, M. and Rani, M. (2018). The Comparison between the Performance of Water and CuO/Water nanofluid in Improving the Heat Transfer of Small Spaces. IOP Conference Series: Materials Science and Engineering, 429, 012073.
• [6] Chavda, N. (2015). Effect of Nanofluid on Heat Transfer Characteristics of Double Pipe Heat Exchanger: Part-II: Effect of Copper Oxide Nanofluid. International Journal of Research in Engineering and Technology, 04(04), 688-696.
• [7] Arshad, A., Jabbal, M., Yan, Y. and Reay, D. (2019). A review on graphene based nanofluids: Preparation, characterization and applications. Journal of Molecular Liquids, 279, 444-484.
• [8] Alshikhi, O. and Kayfeci, M. (2020). Experimental investigation of using graphene nanoplatelets and hybrid nanofluid as coolant in photovoltaic PV/T systems. Thermal Science, 00, 348-348.
• [9] Variyenli, H. İ. (2019). Experimental and Numerical Investigation of Heat Transfer Enhancement In A Plate Heat Exchanger Using A Fly Ash Nanofluid. Heat Transfer Research, 50(15), 1477-1494.
• [10] Sozen, A., Variyenli, H., Ozdemir, M., Guru, M. and Aytac, I., 2016. Heat transfer enhancement using alumina and fly ash nanofluids in parallel and cross-flow concentric tube heat exchangers. Journal of the Energy Institute, 89(3), pp.414-424.