A numerical study of the effect of different geometrical parameters on the cooling processes in electrical transformer
DOI:
https://doi.org/10.31185/ejuow.Vol12.Iss4.576Keywords:
Electrical Transformer, Fin Shape, Heat Transfer Coefficient, Rectangular Fins, Triangular Fins, Transformer Oil, Numerical SimulationAbstract
Proper thermal control is one of the most important aspects that should be considered when utilizing electrical transformers. This research work offers a numerical analysis of the effect of changing the shape of transformer fins on the heat exchange process. Based on the results of CFD simulations, several types of fin shapes such as rectangular, triangular and wavy are discussed to describe the improvements of heat transfer. The study examines the shape of an electrical transformer, determining the optimal distance between fins, fin shapes, transformer shape, rib type, and rib number. The results are then applied to a special case, representing the best of all variables on the transformer. The study also considers the effect of increasing the surface area of the ribs on the fins, and the number of ribs used on the fins. The temperature gradient of a coil, oil, and transformer varies depending on the distance between fins, fin shape, rib type, and number of ribs. The coil temperature is 383 K when the fins are 7 cm apart, 381 K when the fins are 5 cm apart, and 381 K when the fins are 3cm apart. The temperature gradient also varies depending on the rib type, with triangular ribs increasing the surface area for heat energy transfer and reducing the temperature value. The oil temperature gradient varies depending on the fins, ribs type, and number of ribs. The heat transfer coefficient gradient of the transformer surface varies depending on the fins, ribs type, and number of ribs. The surface heat transfer coefficient reaches 1.5 W/m2. K when the fins are l shape, 1.6 W/m2. K when the fins are c shape, 1.7 W/m2. K when the fins are z shape, 1.4 W/m2. K when the ribs are rectangular, 1.6 W/m2. K when the ribs are triangular, and 1.4 W/m2. K when the ribs are 9 ribs.
References
El Wakil, N., Badran, O., & Youssef, M. Thermal performance of transformers with different fin geometries. Journal of Heat Transfer Engineering,2015, 36,7, 701-710.
Joshi, H. M., & Webb, R. L. Heat transfer and friction in the triangular ducts of compact heat exchangers. International Journal of Heat and Mass Transfer,02007, 50,25-26, 5406-5419.
Zhang, Y., Li, J., & Wang, X. Numerical investigation of heat transfer enhancement in wavy finned heat exchangers. Applied Thermal Engineering, 2019, 153, 266-275.
Kays, W. M., & Crawford, M. E. Convective Heat and Mass Transfer. McGraw-Hill Education, 2018.
Bapat, S. M., Sharma, K. V., & Khandekar, S. Experimental investigation of heat transfer enhancement in transformer oil using modified fin shapes. International Journal of Thermal Sciences, 2019, 141, 320-330.
Park, J., Lee, D., & Kim, S. Advanced manufacturing techniques for optimized transformer fin designs. Manufacturing Letters,2022, 33, 1-8.
Khandekar, S., Sharma, K. V., & Pothuraju, M. Heat transfer enhancement using micro-structured surfaces and nano-fluids. Journal of Thermal Science and Engineering Applications, 2018,10,3, 031002.
Marcinichen, J. B., Olivier, J. A., & Thome, J. R. Integration of phase change materials in transformer cooling systems for enhanced thermal management. Applied Energy, 2020, 270, 115107.
Hasan, et al. Enhancing Solar Thermal Systems Efficiency. Energy Journal of Waste Optimization, 2021,11,2. https://doi.org/10.31185/ejuow.Vol11.Iss2.445
Zhao, et al. Energy Storage in Thermal Systems: Challenges and Solutions. Emerging Sustainable Technologies,2021.
Ali, et al. Optimization of Absorption Refrigeration Systems. Journal of Engineering and Advanced Sciences Development Conference, 2019,1,51. https://doi.org/10.31272/jeasd.conf.1.51
Liu, et al. Enhancing Heat Exchanger Performance: An Experimental Approach. Thermal Science and Engineering Progress, 2019,9. https://doi.org/10.1016/j.tsep.2019.100414
Norazman, et al. Nanofluid Applications in Heat Exchanger Design. Advances in Research on Fluid and Thermal Systems, 2022.
Mohamed, et al. Microchannel Heat Exchangers in Solar Energy Systems. Journal of Advanced Heat Transfer Systems, 2020,13,3, 105-119. https://doi.org/10.1016/j.advht.2020.105119
Chen, et al. Nanostructured Fluids for Enhanced Heat Transfer in Heat Exchangers. Journal of Nanotechnology in Thermal Applications, 2018.
Williams, et al. Phase Change Materials for Latent Heat Storage in Thermal Energy Systems. Renewable Energy Reviews,2020, 45,6, 456-473.
Rahman, et al. Hybrid Materials for Enhanced Thermal Energy Storage Systems. International Journal of Thermal Management, 2020, 22,1, 19-31. https://doi.org/10.1016/j.ijtm.2020.101417
Kumar, et al. Performance Evaluation of Solar PV-Thermal Systems with Integrated Thermal Storage. Journal of Clean Energy Technologies, 2021,9,4, 362-371.
Kulkarni, S. V., & Khaparde, S. A. Transformer Engineering: Design, Technology, and Diagnostics. CRC Press, 2004.
Zhao, J., Liu, Z., & Li, Y. Thermal performance analysis of power transformers based on different core geometries. Journal of Electrical Engineering & Technology, 2018,13,2, 500-509. DOI: 10.5370/JEET.2018.13.2.500
Sun, Z., Wang, F., & Jiang, X. Influence of winding configurations on the thermal behavior of power transformers. Applied Thermal Engineering, 2017, 123, 1203-1212. DOI: 10.1016/j.applthermaleng.2017.05.139
Zhou, Y., Li, H., & Zhang, M. Optimization of cooling duct arrangements in oil-immersed power transformers using CFD simulations. International Journal of Thermal Sciences, 2019, 139, 140-150. DOI: 10.1016/j.ijthermalsci.2019.01.003
Hong, T., Park, J., & Lee, D. Effect of cooling channel geometry on the heat dissipation in power transformers. IEEE Access, 2020,8, 103500-103508. DOI: 10.1109/ACCESS.2020.2998651
Dutta, S., & Sen, P. CFD analysis of heat transfer in oil-filled transformers: Influence of geometrical parameters. IEEE Transactions on Dielectrics and Electrical Insulation, 2016, 23,6, 3482-3492. DOI: 10.1109/TDEI.2016.005696
He, J., Liu, W., & Zhang, Z. Advanced CFD modeling techniques for thermal optimization in power transformers. Energy Conversion and Management, 2021, 227, 113599.
Azbar, Nawras Mohammed, and Hayder Mohammad Jaffal, Experimental Study of the Thermal Performance Behavior of Electric Power Transformers, Journal of Engineering and Sustainable Development, First Online Scientific Conference for Graduate Engineering Students, 2020.
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