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This paper studied four distinct multi-shell and multi-helical tube heat exchangers to compare the thermo-hydraulic performance of the series and parallel configurations. Much research has been conducted on thermal and hydraulic performance analysis of shell and helical coiled tube heat exchangers, considering different geometrical and operating design parameters. However, multi-helical tubes with the corresponding multi-shell and the series–parallel configuration of tube design parameters were not considered previously. Hence, considering series–parallel helical tube configuration and multilayers of tubes and shells as design factors makes this paper unique. To examine the thermal and hydraulic performance of each heat exchanger configuration, ANSYS FLUENT 2022R1 is used to simulate the numerical scheme by considering the turbulence model at high Reynolds numbers ranging from 35,000 to 65,000. The conjugated heat transfer model is considered for numerical purposes, and the findings are validated using the approximated literature data. The design parameters involved in this study are the series and parallel heat exchanger configuration, the Reynolds number, two different annular spaces of the shell, and the number of helical tubes/shells. This study is concerned with the comparison of series and parallel multi-shell, multi-helical tube heat exchangers based on the simulation results of thermo-hydraulic performance characteristics like pressure loss, overall heat transfer coefficient, etc. In the present heat exchanger model, the series configuration with two helical tubes exhibited higher thermal performance compared to the parallel helical tube configuration, and the Nusselt number was obtained between 69.95 and 510. The annular space and number of helical tubes significantly affect the thermal performance of multi-shell and multi-helical coiled tube heat exchangers more than the hydraulic performance. However, the series and parallel configuration of the helical tube affects the hydraulic performance significantly, and the numerical result depicts that the parallel configuration of the developed heat exchanger model exhibited better hydraulic performance than the series-configured heat exchanger model.

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Finite Volume Method Analysis of Thermo-Hydraulic Performance Comparison of Series and Parallel Multi-Shell, Multi-Helical Coiled Tube Heat Exchangers

  • 章节

  • 发表日期：

    2025年

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  • Amare Tesfaw Addis,
  • Bimrew Tamrat Admasu,
  • Muluken Zegeye Getie,
  • Muluken Temesgen Tigabu

摘要

This paper studied four distinct multi-shell and multi-helical tube heat exchangers to compare the thermo-hydraulic performance of the series and parallel configurations. Much research has been conducted on thermal and hydraulic performance analysis of shell and helical coiled tube heat exchangers, considering different geometrical and operating design parameters. However, multi-helical tubes with the corresponding multi-shell and the series–parallel configuration of tube design parameters were not considered previously. Hence, considering series–parallel helical tube configuration and multilayers of tubes and shells as design factors makes this paper unique. To examine the thermal and hydraulic performance of each heat exchanger configuration, ANSYS FLUENT 2022R1 is used to simulate the numerical scheme by considering the turbulence model at high Reynolds numbers ranging from 35,000 to 65,000. The conjugated heat transfer model is considered for numerical purposes, and the findings are validated using the approximated literature data. The design parameters involved in this study are the series and parallel heat exchanger configuration, the Reynolds number, two different annular spaces of the shell, and the number of helical tubes/shells. This study is concerned with the comparison of series and parallel multi-shell, multi-helical tube heat exchangers based on the simulation results of thermo-hydraulic performance characteristics like pressure loss, overall heat transfer coefficient, etc. In the present heat exchanger model, the series configuration with two helical tubes exhibited higher thermal performance compared to the parallel helical tube configuration, and the Nusselt number was obtained between 69.95 and 510. The annular space and number of helical tubes significantly affect the thermal performance of multi-shell and multi-helical coiled tube heat exchangers more than the hydraulic performance. However, the series and parallel configuration of the helical tube affects the hydraulic performance significantly, and the numerical result depicts that the parallel configuration of the developed heat exchanger model exhibited better hydraulic performance than the series-configured heat exchanger model.