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Experimental study on convection heat transfer of supercritical CO2 in small upward channels

Author

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  • Lei, Xianliang
  • Zhang, Jun
  • Gou, Lingtong
  • Zhang, Qian
  • Li, Huixiong

Abstract

A supercritical carbon dioxide (s-CO2) Brayton power cycle was extensively applied in several energy systems in this study. This paper presents an experimental investigation of the heat transfer characteristics of supercritical CO2 in a vertical, small circular tube with an inner diameter of 5 mm at a low mass flux but high heat fluxes. Experiments were performed for inlet temperatures ranging from 5 to 40 °C, pressures from 7.5 to 10.5 MPa, mass flux from 50 to 200 kg/m2s, and heat flux from 38 to 234 kW/m2. Results reveal marked differences in heat transfer characteristics under different levels of heat flux at low mass fluxes in the small channel. Buoyancy plays a substantial role in heat transfer at low mass flux, especially under conditions with high heat fluxes. Based on data from this study and experimental results in small channels described in the literature, a new heat transfer model was developed using a deep learning method with the TensorFlow tool, which captures 90% of experimental data within a ±20% error band.

Suggested Citation

  • Lei, Xianliang & Zhang, Jun & Gou, Lingtong & Zhang, Qian & Li, Huixiong, 2019. "Experimental study on convection heat transfer of supercritical CO2 in small upward channels," Energy, Elsevier, vol. 176(C), pages 119-130.
    • Handle: RePEc:eee:energy:v:176:y:2019:i:c:p:119-130
    DOI: 10.1016/j.energy.2019.03.109
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    References listed on IDEAS

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    1. Xu, Jinliang & Sun, Enhui & Li, Mingjia & Liu, Huan & Zhu, Bingguo, 2018. "Key issues and solution strategies for supercritical carbon dioxide coal fired power plant," Energy, Elsevier, vol. 157(C), pages 227-246.
    2. Mecheri, Mounir & Le Moullec, Yann, 2016. "Supercritical CO2 Brayton cycles for coal-fired power plants," Energy, Elsevier, vol. 103(C), pages 758-771.
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    Cited by:

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    6. Zhang, Shijie & Xu, Xiaoxiao & Liu, Chao & Dang, Chaobin, 2020. "A review on application and heat transfer enhancement of supercritical CO2 in low-grade heat conversion," Applied Energy, Elsevier, vol. 269(C).
    7. Wang, Shengpeng & Zhang, Yifan & Li, Hongzhi & Yao, Mingyu & Peng, Botao & Yan, Junjie, 2020. "Thermohydrodynamic analysis of the vertical gas wall and reheat gas wall in a 300 MW supercritical CO2 boiler," Energy, Elsevier, vol. 211(C).
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    9. Lingbo Zhu & Yiping Lu & Jianfei Tong & Tianjiao Liang & Youlian Lu & Weida Fu & Bin Wang & Yunan Zhang, 2021. "Sensitivity Analysis of Influencing Factors of Supercritical Methane Flow and Heat Transfer in a U-Tube," Energies, MDPI, vol. 14(18), pages 1-15, September.

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