This study utilized two double tube-type heat exchangers. The first exchanger employed a smooth inner tube, while the second one utilized a twisted inner tube. The shell was constructed of plastic (PVC), while the tube was made of copper with a length of 1000 mm, an outer diameter of 62.24 mm, a smooth tube inner diameter of 14.2 mm, and an equivalent diameter of 11.8 mm for the twisted tube. To minimize heat loss, the shell was insulated externally with a thermal insulator. A flow rate of 3 liters per minute of hot water was passed through a ring-shaped tunnel, with an inlet temperature of 63 °C, to enhance the heat exchanger's performance. The experimental results of the two heat exchangers (smooth and twisted inner tubes) were compared, and the use of water as the primary fluid led to improved performance. The twisted inner tube-type heat exchanger achieved a maximum efficiency of 0.33 at a volumetric flow rate of 5 liters per minute, while the maximum improvement in effectiveness was 65.71% at a volume flow rate of 3 liters per minute in the twisted inner tube-type heat exchanger.
Abbas, E. F., Ali, H. H. M., & Mahmood, N. J. (2021). Comparison between numerical study and experimental work on heat transfer from heat sink under transient conditions. Journal of Mechanical Engineering Research and Developments, 44(7), 141-150.
Ali, H.H.M., Hussein, A.M., Allami, K.M.H., & Mohamad, B. (2023). Evaluation of shell and tube heat exchanger performance by using ZnO/water nanofluids. Journal of Harbin Institute of Technology (New Series). https://doi.org/10.11916/j.issn.1005-9113.2023001.
Ali, M.Q., & Mohamad, B. (2022). A review of the design and control using computational fluid dynamics of gasoline direct injection engines. Diagnostyka, 23(3), 1-8. https://doi.org/10.29354/diag/153373.
Barrak, A. S., Ali, N. M., & Ali, H. H. M. (2022). An effect of binary fluid on the thermal performance of pulsation heat pipe. International Journal of Applied Mechanics and Engineering, 27(1), 21–34. https://doi.org/10.2478/ijame-2022-0002.
Bergies, E.A. (1999). The imperative to enhance heat transfer (S. Kakaç, A.E. Bergles, F. Mayinger, H. Yüncü, Eds). Heat Transfer Enhancement of Heat Exchangers. Nato ASI Series, 355. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-9159-1_2.
Bergman, T. L., Incropera, F. P., Dewitt, D. P., & Lavine, A. S. (2011). Fundamentals of heat and mass transfer. John Wiley & Sons.
Berkache, A., Amroune, S., Golbaf, A., & Mohamad, B. (2022). Experimental and numerical investigations of a turbulent boundary layer under variable temperature gradients. Journal of the Serbian Society for Computational Mechanics, 16(1), 1-15. https://doi.org/10.24874/jsscm.2022.16.01.01.
Eiamsa-Ard, S., Promthaisong, P., Thianpong, C., Pimsarn, M., & Chuwattanakul, V. (2016). Influence of three-start spirally twisted tube combined with triple-channel twisted tape insert on heat transfer enhancement. Chemical Engineering and Processing: Process Intensification, 102, 117–129. https://doi.org/10.1016/j.cep.2016.01.012.
Eltaweel, M., Abdel‐Rehim, A. A., & Hussien, H. (2020). Indirect thermosiphon flat‐plate solar collector performance based on twisted tube design heat exchanger filled with nanofluid. Intertnational Journal of Energy Research, 44(6), 4269–4278. https://doi.org/10.1002/er.5146.
Farnam, M., Khoshvaght-Aliabadi, M., & Asadollahzadeh, M. J. (2021). Intensified single-phase forced convective heat transfer with helical-twisted tube in coil heat exchangers. Annals of Nuclear Energy, 154, 108108. https://doi.org/10.1016/j.anucene.2020.108108.
Hayder, H. Ali, M. Hussein, A. M. Mohammed, K. Allami, H. & Mohamad, B. (2023). Evaluation of shell and tube heat exchanger performance by using ZnO/water nanofluids. Journal of Harbin Institute of Technology (New Series). https://doi.org/10.11916/j.issn.1005-9113.2023001.
Holman, J. P. (2008). Heat transfer. 6th Ed. Tata McGraw-Hill Education.
Khoshvaght-Aliabadi, M., & Feizabadi, A. (2020). Performance intensification of tubular heat exchangers using compound twisted-tape and twisted-tube. Chemical Engineering and Processing - Process Intensification, 148, 107799. https://doi.org/10.1016/j.cep.2019.107799.
Lee, H. (2022). Thermal design: heat sinks, thermoelectrics, heat pipes, compact heat exchangers, and solar cells. John Wiley & Sons.
Pardhi C. K., & Baredar, P. (2012). Performance improvement of double pipe heat exchanger by using turbulator. International Journal of Engineering Science & Advanced Technology, 2(4), 881–885.
Qader, F., Hussein, A., Danook, S., Mohamad, B., & Khaleel, O. (2023). Enhancement of double-pipe heat exchanger effectiveness by using porous media and TiO2 water. CFD Letters, 15(4), 31-42. https://doi.org/10.37934/cfdl.15.4.3142.
Rousseau, P. G., Van Eldik, M., & Greyvenstein, G. P. (2003). Detailed simulation of fluted tube water heating condensers. International Journal of Refrigeration, 26(2), 232–239. https://doi.org/10.1016/S0140-7007(02)00077-4.
Samruaisin, P., Kunlabud, S., Kunnarak, K., Chuwattanakul, V., & Eiamsa-Ard, S. (2019). Intensification of convective heat transfer and heat exchanger performance by the combined influence of a twisted tube and twisted tape. Case Studies in Thermal Engineering, 14, 100489. https://doi.org/10.1016/j.csite.2019.100489.
Shah, R.K. (1986). Classification of heat exchangers h (S. Kakac, A.E. Bergles, F. Mayinger, Eds.). Heat exchangers: Thermal Hydraulic Fundamentals and Design. Hemisphere Publishing Corp., Washington, DC.
Shah, R. K., & Sekulic, D. P. (2003). Fundamentals of heat exchanger design. John Wiley & Sons.
Shrirao, P. N., Sambhe, R. U., & Bodade, P. R. (2013). Experimental investigation on turbulent flow heat transfer enhancement in a horizontal circular pipe using internal threads of varying depth. IOSR Journal of Mechanical and Civil Engineering, 5(3), 23–28.
Thantharate, V., & Zodpe, D. B. (2013). Experimental and numerical comparison of heat transfer performance of twisted tube and plain tube heat exchangers. International Journal of Scientific & Engineering Research, 4(7), 1107–1113.
Thulukkanam, K. (2000). Heat exchanger design handbook. CRC Press. https://doi.org/10.1201/9781420026870.
Walker, G. (1982). Industrial heat exchangers: a basic guide. Hemisphere Publishing Corporation.
Wang, L., Sun, D.W., Liang, P., Zhuang, L., & Tan, Y. (2000). Heat transfer characteristics of carbon steel spirally fluted tube for high pressure preheaters. Energy Conversion and Management, 41(10), 993–1005. https://doi.org/10.1016/S0196-8904(99)00159-4.
Yan, W., Gao, X., Xu, W., Ding, C., Luo, Z., & Zhang, Z. (2017). Heat transfer performance of epoxy resin flows in a horizontal twisted tube. Applied Thermal Engineering, 127, 28–34. https://doi.org/10.1016/j.applthermaleng.2017.08.013.