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Heat-Transfer Characteristics of Liquid Sodium in a Solar Receiver Tube with a Nonuniform Heat Flux

Author

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  • Jing Liu

    (School of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China)

  • Yongqing He

    (School of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China)

  • Xianliang Lei

    (State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

Abstract

This paper presents a numerical simulation on the heat transfer of liquid sodium in a solar receiver tube, as the liquid sodium is a promising heat-transfer candidate for the next generation solar-power-tower (SPT) system. A comparison between three mediums—solar salt, Hitec and liquid sodium—is presented under uniform and nonuniform heat-flux configurations. We studied the effects of mass flow rate ( Q m ), inlet temperature ( T in ), and maximum heat flux ( q o max ), on the average heat-transfer coefficient ( h ) and the friction coefficient ( f ) of the three mediums. The results show that the h of liquid sodium is about 2.5 to 5 times than other two molten salts when T in is varying from 550 to 800 K, Q m is 1.0 kg/s, and q o max is 0.1 MW/m 2 . For maximum heat fluxes from 0.1 to 0.3 MW/m 2 , the h of liquid sodium is always an order of magnitude larger than that of Hitec and Solar-Salt (S-S), while maintaining a small friction coefficient.

Suggested Citation

  • Jing Liu & Yongqing He & Xianliang Lei, 2019. "Heat-Transfer Characteristics of Liquid Sodium in a Solar Receiver Tube with a Nonuniform Heat Flux," Energies, MDPI, vol. 12(8), pages 1-16, April.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:8:p:1432-:d:222646
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    References listed on IDEAS

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    Cited by:

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    2. Jianfeng Lu & Yarong Wang & Jing Ding, 2020. "Nonuniform Heat Transfer Model and Performance of Molten Salt Cavity Receiver," Energies, MDPI, vol. 13(4), pages 1-19, February.
    3. Chen, Rui & Romero, Manuel & González-Aguilar, José & Rovense, Francesco & Rao, Zhenghua & Liao, Shengming, 2022. "Optical and thermal integration analysis of supercritical CO2 Brayton cycles with a particle-based solar thermal plant based on annual performance," Renewable Energy, Elsevier, vol. 189(C), pages 164-179.

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