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Computational study of helical coil heat exchanger: Energy, entropy, exergy, entransy (4E) analysis and application of field synergy principle.

Author(s) : YI YING CHUA M. A., KUMAR P., SHAH M. T.

Type of article: IJR article

Summary

The current global energy crisis requires high-efficiency energy conversion and management systems. Besides maximising heat transfer, reducing energy loss is also an effective method for energy resource sustainability. Helical coil heat exchangers have a compact design and superior heat transfer capacity compared to conventional shell-and-tube heat exchangers. However, the designing process often relies on the first law of thermodynamics without an in-depth understanding of the interplay between local flow conditions and energy destruction, leading to efficiency loss. Therefore, the current study investigates turbulent heat transfer in helical coil tubes to analyse local flow conditions using energy, entransy, entropy, and exergy principles with supercritical carbon dioxide. The perspective concerning the synergy between velocity vectors and temperature gradients is also included. Under the combined effects of centrifugal and buoyancy forces, local flow features are revealed, and heat transfer improves up to 58 % principally due to thermophysical properties variations of bulk fluid. The most efficient energy utilisation leads to 60 % reduction in entransy dissipation, which coincides with the maximum heat transfer performance. Sources and locations with inefficient energy utilisation serve as guidelines for designing more effective heat transfer systems. Entropy and exergy analyses are also consistent to heat transfer, and entropy generation paradox is not observed in local thermodynamic analysis. However, synergy angle and field synergy number are not suitable to analyse supercritical flows.

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Pages: 41-63

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Details

  • Original title: Computational study of helical coil heat exchanger: Energy, entropy, exergy, entransy (4E) analysis and application of field synergy principle.
  • Record ID : 30033646
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 172
  • Publication date: 2025/04
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2025.01.026

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