THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

Authors of this Paper

External Links

Xin Gu

,

Xin Liu

,

Hao Sun

,

Yiwen Zhu

,

Yongqing Wang

online first only

Analysis of flow and heat transfer performance of different types of flow channels in PCHE for pre-coolers

ABSTRACT
The shape of fins in flow channels of Printed Circuit Heat Exchangers (PCHE) significantly affects the heat exchanger performance. In the pre-cooler condition of the marine supercritical carbon dioxide (sCO2) Brayton cycle power generation system, this study focuses on three typical discontinuous flow channel Printed Circuit Heat Exchangers (PCHEs). The investigation involves a numerical analysis of flow and heat transfer performance using Computational Fluid Dynamics (CFD) method. The comparative consequences illuminate that the rectangular fin channel exhibits the optimal heat transfer performance, and temperature drops are 1.18 times and 1.23 times, exceeding those of airfoil and rhombic fin channels, respectively. All three flow channels show different degrees of temperature drop reduction along the direction of fluid flow. However, the rectangular fin channel demonstrates the worst flow performance, as pressure drops are 16.6 times and 17.8 times, higher than those of airfoil and rhombic fin channels, respectively. By calculating the values of Nu/f and Q/Δp, the comprehensive performance of each flow channel is ranked from high to low as follows: airfoil fin channel, rhombic fin channel, and rectangular fin channel. This research provides guidance for optimizing the design and applying PCHEs in engineering for marine sCO2 Brayton cycle pre-coolers.
KEYWORDS
printed circuit heat exchanger, Channels, comprehensive performance
PAPER SUBMITTED: 2023-09-02
PAPER REVISED: 2024-01-04
PAPER ACCEPTED: 2024-01-23
PUBLISHED ONLINE: 2024-04-13
DOI REFERENCE: https://doi.org/10.2298/TSCI230902072G
REFERENCES
  1. Ming, Y., et al., Dynamic modeling and validation of the 5 MW small modular supercritical CO2 Brayton-Cycle reactor system. Energy Conversion and Management, 253. (2022), pp. 115184.
  2. Jin, S.K., et al., Compact heat exchangers for supercritical CO2 power cycle application. Energy Conversion and Management, 209. (2020), pp. 112666.
  3. Yan, X.P., et al., Review on sCO2 Brayton cycle power generation technology based on ship waste heat recovery utilization. China Mechanical Engineering, 30. (2019), pp.939-946
  4. Bai, J., et al., Numerical investigation on thermal hydraulic performance of supercritical LNG in sinusoidal wavy channel based printed circuit vaporizer. Applied Thermal Engineering, 175. (2020)
  5. Lee, Y. and J.I. Lee, Structural assessment of intermediate printed circuit heat exchanger for sodium-cooled fast reactor with supercritical CO2 cycle. Annals of Nuclear Energy, 73. (2014), pp. 84-95.
  6. Pan, J., et al., Numerical investigation on thermal-hydraulic performance of a printed circuit LNG vaporizer. Applied Thermal Engineering, 165. (2020), pp. 114447.
  7. Cheng, Y., et al., Multi-objective optimization of printed circuit heat exchanger used for hydrogen cooler by exergoeconomic method. Energy, 262. (2023), pp. 125455.
  8. Shi, H.Y., et al., Heat transfer and friction of molten salt and supercritical CO2 flowing in an airfoil channel of a printed circuit heat exchanger. International Journal of Heat and Mass Transfer, 150. (2020), pp. 119006.
  9. Chu,W.X., et al., Heat transfer and pressure drop performance of printed circuit heat exchanger with different fin structures. Chinese Science Bulletin, 62. (2017), pp.1788-1794
  10. Morteza, et al., Numerical analysis of heat transfer and flow characteristics of supercritical CO2-cooled wavy mini-channel heat sinks. Applied Thermal Engineering, 226. (2023),pp.120307
  11. Xu, X.Y., et al., Thermal-hydraulic performance of different discontinuous fins used in a printed circuit heat exchanger for supercritical CO2. Numerical Heat Transfer Part A Applications, 68. (2015), pp. 1067-1086.
  12. Meshram, A., et al., Modeling and analysis of a printed circuit heat exchanger for supercritical CO2 power cycle applications. Applied Thermal Engineering, 109. (2016), pp. 861-870.
  13. Chu, W.X., et al., Experimental investigation on SCO2-water heat transfer characteristics in a printed circuit heat exchanger with straight channels. International Journal of Heat and Mass Transfer, 113.(2017),pp. 184-194.
  14. Xu, Z.R., et al., Study on mechanical stress of semicircular and rectangular channels in printed circuit heat exchangers. Energy, 238. (2022), pp. 121655.
  15. Ngo, T.L., et al., Heat transfer and pressure drop correlations of microchannel heat exchangers with S-shaped and zigzag fins for carbon dioxide cycles. Experimental Thermal and Fluid Science, 32. (2007), pp. 560-570.
  16. Yang, Y., et al., Experimental study of the flow and heat transfer performance of a PCHE with rhombic fin channels. Energy Conversion and Management, 254. (2022),pp. 115137.
  17. Lin, Y.S., et al., Numerical investigation on thermal performance and flow characteristics of Z and S shape printed circuit heat exchanger using S-CO2, Thermal Science, 23 (2019), Suppl, 3, pp. S757-S764
  18. Ma, Y., et al., Performance study on a printed circuit heat exchanger composed of novel airfoil fins for supercritical CO2 cycle cooling system, Thermal Science, (2022), DOI No. doi.org/10.2298/TSCI220408112M
  19. Jin, F., et al., Thermo-Hydraulic performance of printed circuit heat exchanger as precooler in supercritical CO2 Brayton cycle. Applied Thermal Engineering, 210. (2022), pp. 118341.
  20. Pidaparti, S.R., M.H. Anderson and D. Ranjan, Experimental investigation of thermal-hydraulic performance of discontinuous fin printed circuit heat exchangers for supercritical CO2 power cycles. Experimental Thermal and Fluid Science, 106. (2019), pp. 119-129.
  21. Chu, W.X., et al., Thermo-Hydraulic performance of printed circuit heat exchanger with different cambered airfoil fins. Heat Transfer Engineering, 41. (2019), pp. 1-14.
  22. Gao, Y.C., et al., Study on the Effects of channel width and fin angle on heat transfer and pressure drop of zigzag PCHE. Journal of Engineering for Thermal Energy And Power, 34. (2019), pp.94-100
  23. Liu, B.H., et al., Thermal-hydraulic performance analysis of printed circuit heat exchanger precooler in the Brayton cycle for supercritical CO2 waste heat recovery. Applied Energy, 305. (2022), pp. 117923.
  24. A., M.A., et al., Thermal-hydraulic characteristics and performance of 3D straight channel based printed circuit heat exchanger. Applied Thermal Engineering, 98. (2016)
  25. Lemmon, E.W., M.L. Huber and M.O. Mclinden, NIST Standard ReferenceDatabase 23: Reference Fluid Thermodynamic and Transport Properties-REFPROP. 9.0. NIST NSRDS -, 2010.
  26. Palko, D. and H. Anglart, Theoretical and numerical study of heat transfer deterioration in high performance light water reactor. Science and Technology of Nuclear Installations, 2008. (2008), pp. 1-5.
  27. Moffatt, H.K. and A. Tsinober, Helicity in laminar and turbulent flow. Annual Review of Fluid Mechanics, 24.(2003),pp. 281-312.
  28. Lv, Y.G., et al., Numerical investigation on thermal hydraulic performance of hybrid wavy channels in a supercritical CO2 precooler. International Journal of Heat and Mass Transfer, 181. (2021), pp. 121891.
  29. Fan, J.F., et al., A performance evaluation plot of enhanced heat transfer techniques oriented for energy-saving. International Journal of Heat and Mass Transfer, 52. (2009), pp. 33-44.
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Analysis of flow and heat transfer performance of different types of flow channels in PCHE for pre-coolers