Analysis and finding optimal values of a heat exchanger for using in diesel engine exhaust system

Document Type : Original Article

Authors

1 Associate Professor Malek Ashtar University of Technology, Tehran, Iran

2 Assistant Professor, Malek Ashtar University of Technology, Tehran, Iran

3 Associate Professor, Malek Ashtar University of Technology, Tehran, Iran

Abstract

In the presented research, the analysis and finding optimal values of a heat exchanger used in the exhaust system of a diesel engine has been discussed. The main purpose of using this heat exchanger is to reduce the temperature of combustion products exhausting from the engine. This can be done by mounting a heat exchanger at the exhaust gas path. In order to analyze the issue, different designs of heat exchangers have been regarded. Three- and five-tube heat exchangers reduce the temperature of the smoke to an acceptable level by increasing the contact surface between the smoke and the cooling water. However, the pressure drop created on the side of the smoke is high in these designs. The use of annular fins and longitudinal fins on the smoke side also increase the heat transfer by increasing the contact surface between the smoke and water flow and the turbulence in the smoke path. However, in this design the heat exchanger outlet temperature is higher than allowed value (350 ). Furthermore, in this design, the pressure drop also increases. After the investigations carried out to reduce the temperature of the smoke, shell and tube heat exchangers have been chosen as the final designs. The shell and tube heat exchangers is capable to reduce the exhaust temperature to 309.42 .

Keywords

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References

[1] Mohammed, H. A., Husam, A. H., and Wahid, M. A. “Heat transfer enhancement of nanofluids in a double pipe heat exchanger with louvered strip inserts”, International Communications in Heat and Mass Transfer, Vol. 40, pp. 36-46, 2013.
[2] Syed, K. S., Muhammad, I., Zafar, I., and Ahmad, H. “Numerical study of an innovative design of a finned double-pipe heat exchanger with variable fin-tip thickness”, Energy conversion and management, Vol. 98, pp. 69-80, 2015.
[3] Sheikholeslami, M., and Ganji, D.D. “Heat transfer improvement in a double pipe heat exchanger by means of perforated turbulators”, Energy Conversion and management, Vol. 127, pp. 112-123, 2016.
[4] Maakoul, A.E., El Metoui, M., Abdellah, A., Saadeddine, S., and Meziane, M. “Numerical investigation of thermohydraulic performance of air to water double-pipe heat exchanger with helical fins”,  Applied Thermal Engineering, Vol. 127, pp. 127-139, 2017.
[5] El Maakoul, A., Laknizi, A., Saadeddine, S., Abdellah, A., Meziane, M., and El Metoui, M. “Numerical design and investigation of heat transfer enhancement and performance for an annulus with continuous helical baffles in a double-pipe heat exchanger”, Energy conversion and management, Vol. 133, pp. 76-86, 2017.
[6] Noorbakhsh, M., Zaboli, M., and Mousavi Ajarostaghi, S.S. “Numerical evaluation of the effect of using twisted tapes as turbulator with various geometries in both sides of a double-pipe heat exchanger”, J of Thermal Analysis and Calorimetry, Vol. 140, NO. 3, pp. 1341-1353, 2020.
[7] Mozafarie, S.Sh., Javaherdeh, K., and Ghanbari, O. “Numerical simulation of nanofluid turbulent flow in a double-pipe heat exchanger equipped with circular fins”, J. Thermal Analysis and Calorimetry, Vol. 143, NO. 6, pp. 4299-4311, 2021.
[8] Braga, C.V.M., and Saboya, F.E.M. “Turbulent heat transfer, pressure drop and fin efficiency in annular regions with continuous longitudinal rectangular fins”, Experimental thermal and fluid sic, Vol. 20, NO. 2, pp. 55-65. 1999.
[9] Taborek, J. “Double-pipe and multitube heat exchangers with plain and longitudinal finned tubes”, Heat Transfer Engineering, Vol. 18, NO. 2, pp. 34-45, 1997.
[10] Iqbal, Z., Syed, K. S.,  and Ishaq, M. “Fin design for conjugate heat transfer optimization in double pipe”, International J of Thermal Sic, Vol. 94, pp. 242-258, 2015.
[11] Naphon, P. “Heat transfer and pressure drop in the horizontal double pipes with and without twisted tape insert”, International Communications in Heat and Mass Transfer, Vol. 33, NO. 2, pp. 166-175, 2006.
[12] Zhang, Li., Hongmei, G., Jianhua, W., and Wenjuan, D. “Compound heat transfer enhancement for shell side of double-pipe heat exchanger by helical fins and vortex generators”, Heat and Mass Transfer, Vol. 48, NO. 7, pp. 1113-1124, 2012.
[13] Naphon, P. “Effect of coil-wire insert on heat transfer enhancement and pressure drop of the horizontal concentric tubes”, International Communications in Heat and Mass Transfer, Vol. 33, NO. 6, pp. 753-763, 2006.
[14] Khani, N., and Hamidi, H. “Designing of the solar absorption refrigerator heat transfer system using solar pannels”, Biseasonal journal of fluid mechanics and aerodynamics, Vol. 3, 2015. (in Persian)
[15] Siavashi, M., Bahrami, H.R.T., and Aminian, E. "Optimization of heat transfer enhancement and pumping power of a heat exchanger tube using nanofluid with gradient and multi-layered porous foams", Applied Thermal Engineering, 138, pp.465-474, 2018.
 [16] Shih, T.H., Liou, W.W., Shabbir, A., Yang, Z., and Zhu, J. “A new k–ε eddy viscosity model for high Reynolds number turbulent flows”, Comput. Fluids, Vol. 24, pp. 227–238, 1995.
[17] Menter, F. R. “Two-equation eddy-viscosity turbulence models for engineering applications”, AIAA journal, Vol. 32, NO. 8, pp. 1598-1605, 1994.
 [18] American Society of Mechanical Engineers, “ASME boiler and pressure vessel code”, New York, 2019.
[19] TEMA, “Standards of The Tubular Exchanger Manufacturers Association, tenth ed. Tubular Exchanger Manufacturers Association”, New York, 2019

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History

  • Receive Date: 19 August 2022
  • Revise Date: 21 November 2022
  • Accept Date: 01 January 2023
  • Publish Date: 20 February 2023

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