Thermal Performance Improvement of a Counter-Flow Double-Pipe Heat Exchanger Using a Twisted Turbulator
DOI:
https://doi.org/10.31004/jestm.v6i1.387Keywords:
Double-pipe heat exchanger, effectiveness, pitch ratio, thermal performance, twisted turbulator, waste heat recoveryAbstract
Internal combustion systems, such as 5 KVA generators, convert only part of fossil fuel energy into useful work, while the remaining energy is released as waste heat through exhaust gas, cooling systems, and mechanical losses. This study aims to improve the thermal performance of a double-pipe heat exchanger using a twisted turbulator by varying the pitch-to-diameter ratio, p/d, from 0.8 to 3.9. The experiment was conducted at the Thermodynamics and Heat Transfer Laboratory, Faculty of Engineering, Pattimura University, using five p/d variations, namely 0.8, 1.6, 2.4, 3.2, and 3.9. The operating conditions were maintained constant, with a hot fluid inlet temperature of 523.2 K, a cold fluid inlet temperature of 308.2 K, a cold fluid velocity of 1.0 m/s, and a hot fluid velocity of 5.0 m/s. The main components included a copper tube bank, steel pipe casing, thermocouples, flowmeter, pipe system, and valves. The performance parameters were evaluated using Reynolds number, Prandtl number, friction factor, Nusselt number, overall heat transfer coefficient, actual heat transfer rate, maximum heat transfer rate, and effectiveness. The results show that the best performance was obtained at p/d = 0.8, producing a cold fluid outlet temperature of 425.84 K, Nusselt number of 7.569, overall heat transfer coefficient of 0.2029 W/m²·K, and effectiveness of 39.95%. The lower p/d ratio enhanced swirl flow, turbulence intensity, fluid mixing, and thermal boundary layer disruption. Therefore, p/d = 0.8 is recommended for improving the tested heat exchanger performance in small-scale waste heat recovery applications under laboratory operating conditions and design.
References
Creswell, J. W., & Creswell, J. D. (2023). Research design: Qualitative, quantitative, and mixed methods approaches (6th ed.). SAGE Publications. https://doi.org/10.1007/978-3-031-64050-4
Digdoyo, A., Surawan, T., Djamruddin, D., Yuniati, E., Ardiyan, D., & Saputra, A. (2021). Review: Utilization of waste heat from internal combustion engines as renewable energy through exhaust gas recovery process. Technology of Renewable Energy Development, 130–144.
Douadi, O., Ravi, R., Faqir, M., & Essadiqi, E. (2022). A conceptual framework for waste heat recovery from compression ignition engines: Technologies, working fluids & heat exchangers. Energy Conversion and Management X, 16, 100309. https://doi.org/10.1016/j.ecmx.2022.100309
Emzir. (2022). Qualitative research methodology: Sampling techniques, data analysis, and applications. Pustaka Setia. https://doi.org/10.5281/zenodo.6802990
El Maakoul, A., Feddi, K., Saadeddine, S., Ben Abdellah, A., & El Metoui, M. (2020). Performance enhancement of finned annulus using surface interruptions in double-pipe heat exchangers. Energy Conversion and Management, 210, 112710. https://doi.org/10.1016/j.enconman.2020.112710
Fetuga, I. A., Olakoyejo, O. T., Abolarin, S. M., Gbegudu, J. K., Onwuegbusi, A., & Adelaja, A. O. (2023). Numerical analysis of thermal performance of waste heat recovery shell and tube heat exchangers on counter-flow with different tube configurations. Alexandria Engineering Journal, 64, 859–875. https://doi.org/10.1016/j.aej.2022.09.017
Jouhara, H., Khordehgah, N., Almahmoud, S., Delpech, B., Chauhan, A., & Tassou, S. A. (2018). Waste heat recovery technologies and applications. Thermal Science and Engineering Progress, 6, 268–289. https://doi.org/10.1016/j.tsep.2018.04.017
Luo, C., & Song, K. W. (2021). Thermal performance enhancement of a double-tube heat exchanger with novel twisted annulus formed by counter-twisted oval tubes. International Journal of Thermal Sciences, 164, 106892. https://doi.org/10.1016/j.ijthermalsci.2021.106892
Masud, M. H., Ananno, A. A., Ahmed, N., Dabnichki, P., & Salehin, K. N. (2020). Experimental investigation of a novel waste heat based food drying system. Journal of Food Engineering, 281, 110002. https://doi.org/10.1016/j.jfoodeng.2020.110002
Mokhtar, Z., Vanden Berghe, J., & Blondeau, J. (2023). Experimental characterization of a spiral heat exchanger for waste water heat recovery from partially filled sewage pipes. Case Studies in Thermal Engineering, 52, 103770. https://doi.org/10.1016/j.csite.2023.103770
Salameh, T., Alkasrawi, M., Olabi, A. G., Al Makky, A., & Abdelkareem, M. A. (2023). Experimental and numerical analysis of heat transfer enhancement inside concentric counter flow tube heat exchanger using different nanofluids. International Journal of Thermofluids, 20, 100432. https://doi.org/10.1016/j.ijft.2023.100432
Sugiyono. (2021). Quantitative, qualitative, and R&D research methods. Alfabeta. https://doi.org/10.5281/zenodo.5812846
Sudaryono. (2021). Scientific research methods: Quantitative, qualitative, and development approaches. Graha Ilmu. https://doi.org/10.5281/zenodo.4728241
Tavousi, E., Perera, N., Flynn, D., Hasan, R., & Rahman, M. (2024). Effect of novel turbulators on the hydrothermal performance of counterflow double tube heat exchanger using nanofluids. International Journal of Heat and Fluid Flow, 107, 109427. https://doi.org/10.1016/j.ijheatfluidflow.2024.109427
Tang, S., Xie, X., Zhao, Z., & Ding, L. (2022). Investigation of thermal-hydraulic characteristics in a novel finned tube heat exchanger for flue gas waste heat recovery. Case Studies in Thermal Engineering, 39, 102392. https://doi.org/10.1016/j.csite.2022.102392
Salameh, T., Alkasrawi, M., Olabi, A. G., Al Makky, A., & Abdelkareem, M. A. (2023). Experimental and numerical analysis of heat transfer enhancement inside concentric counter flow tube heat exchanger using different nanofluids. International Journal of Thermofluids, 20, 100432. doi:10.1016/j.ijft.2023.100432
Tang, S., Xie, X., Zhao, Z., & Ding, L. (2022). Investigation of thermal-hydraulic characteristics in a novel finned tube heat exchanger for flue gas waste heat recovery. Case Studies in Thermal Engineering, 39, 102392. doi:10.1016/j.csite.2022.102392
Tavousi, E., Perera, N., Flynn, D., Hasan, R., & Rahman, M. (2024). Effect of novel turbulators on the hydrothermal performance of counterflow double tube heat exchanger using nanofluids. International Journal of Heat and Fluid Flow, 107, 109427. doi:10.1016/j.ijheatfluidflow.2024.109427
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