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Investigation of potential of improvement of helical coils based on avoidable and unavoidable exergy destruction concepts

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  • Bahiraei, Farid
  • Saray, Rahim Khoshbakhti
  • Salehzadeh, Aidin

Abstract

An inevitable problem challenges heat exchanger designers is that the heat transfer augmentation in a thermal system is always achieved at the expense of an increase in pressure loss. Thus, the trade-off by choosing the most proper configuration and best flow condition has become the critical problem for design work. The brief survey on literature shows that optimal Reynolds number of laminar forced convection in a helical tube, was specified based on minimum entropy generation. Therefore, the present study analyzes the thermodynamic potential of improvement for steady, laminar, fully developed, forced convection in a helical coiled tube subjected to uniform wall temperature based on the concept of avoidable and unavoidable exergy destruction. The influence of various parameters such as coil curvature ratio, dimensionless inlet temperature difference, dimensionless passage length of the coil, and fluid properties on avoidable exergy destruction have been investigated for water as working fluid. Results show considerable potential of thermodynamic optimization of helical coil tubes. In addition, a relation for determining the amount of optimum Dean Number is proposed for the range considered in the present study.

Suggested Citation

  • Bahiraei, Farid & Saray, Rahim Khoshbakhti & Salehzadeh, Aidin, 2011. "Investigation of potential of improvement of helical coils based on avoidable and unavoidable exergy destruction concepts," Energy, Elsevier, vol. 36(5), pages 3113-3119.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:5:p:3113-3119
    DOI: 10.1016/j.energy.2011.02.057
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    References listed on IDEAS

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    1. Ko, T.H. & Ting, K., 2006. "Optimal Reynolds number for the fully developed laminar forced convection in a helical coiled tube," Energy, Elsevier, vol. 31(12), pages 2142-2152.
    2. Naphon, Paisarn & Wongwises, Somchai, 2006. "A review of flow and heat transfer characteristics in curved tubes," Renewable and Sustainable Energy Reviews, Elsevier, vol. 10(5), pages 463-490, October.
    3. Satapathy, Ashok K., 2009. "Thermodynamic optimization of a coiled tube heat exchanger under constant wall heat flux condition," Energy, Elsevier, vol. 34(9), pages 1122-1126.
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    1. Ahadi, Mohammad & Abbassi, Abbas, 2015. "Entropy generation analysis of laminar forced convection through uniformly heated helical coils considering effects of high length and heat flux and temperature dependence of thermophysical properties," Energy, Elsevier, vol. 82(C), pages 322-332.
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    3. Huminic, Gabriela & Huminic, Angel, 2016. "Heat transfer and flow characteristics of conventional fluids and nanofluids in curved tubes: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 58(C), pages 1327-1347.
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    5. Amani, E. & Nobari, M.R.H., 2011. "A numerical investigation of entropy generation in the entrance region of curved pipes at constant wall temperature," Energy, Elsevier, vol. 36(8), pages 4909-4918.
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    7. Khoshvaght-Aliabadi, M. & Tavasoli, M. & Hormozi, F., 2015. "Comparative analysis on thermal–hydraulic performance of curved tubes: Different geometrical parameters and working fluids," Energy, Elsevier, vol. 91(C), pages 588-600.
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    9. Li, Zhouhang & Zhai, Yuling & Li, Kongzhai & Wang, Hua & Lu, Junfu, 2016. "A quantitative study on the interaction between curvature and buoyancy effects in helically coiled heat exchangers of supercritical CO2 Rankine cycles," Energy, Elsevier, vol. 116(P1), pages 661-676.

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