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Field synergy principle analysis for reducing natural convection heat loss of a solar cavity receiver

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  • Li, Yuqiang
  • Liu, Gang
  • Rao, Zhenghua
  • Liao, Shengming

Abstract

Due to the operating temperature from 900 K to 1300 K produced by the concentrating ratio over 2000 in solar parabolic dish-engine system, the natural convection heat loss driven by the buoyancy force of air contributes an important role in the energy loss of cavity receiver. 3-D numerical simulations were performed and the results are analyzed from the novel viewpoint of field synergy principle (FSP) in order to study the heat transfer and fluid flow characteristics in natural convection heat loss of cavity receiver. The effects of geometric parameters, including the inclination angle, aperture size, aperture position and cavity geometric shape on the natural convection heat loss of cavity receiver were examined. The FSP analysis on the simulation results demonstrates that FSP can well explain the reduction mechanism for natural convection heat loss of cavity receiver because the smaller inner production of velocity vector and temperature gradient always corresponds to the lower Nusselt number occurred in the cases with lager inclination angle, smaller aperture size, lower aperture position and frustum-cylinder cavity, respectively. Therefore, the reducing natural convection heat loss attributes to the weakening synergy between velocity vector and temperature gradient. In addition, the local heat transfer performance is studied by the presented distributions of heat transferred via fluid motion, where more interesting natural convection heat loss characteristics of cavity receiver and the detailed explanations were provided. The results of this work offer benefits for the development of theory and technique about reducing natural convection heat loss of cavity receiver.

Suggested Citation

  • Li, Yuqiang & Liu, Gang & Rao, Zhenghua & Liao, Shengming, 2015. "Field synergy principle analysis for reducing natural convection heat loss of a solar cavity receiver," Renewable Energy, Elsevier, vol. 75(C), pages 257-265.
  • Handle: RePEc:eee:renene:v:75:y:2015:i:c:p:257-265
    DOI: 10.1016/j.renene.2014.09.055
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    References listed on IDEAS

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    Cited by:

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    2. Jiaqiang, E. & Zhao, Xiaohuan & Liu, Haili & Chen, Jianmei & Zuo, Wei & Peng, Qingguo, 2016. "Field synergy analysis for enhancing heat transfer capability of a novel narrow-tube closed oscillating heat pipe," Applied Energy, Elsevier, vol. 175(C), pages 218-228.
    3. Hui Xiao & Zhimin Dong & Rui Long & Kun Yang & Fang Yuan, 2019. "A Study on the Mechanism of Convective Heat Transfer Enhancement Based on Heat Convection Velocity Analysis," Energies, MDPI, vol. 12(21), pages 1-22, November.
    4. Zhao, Xiaohuan & E, Jiaqiang & Zhang, Zhiqing & Chen, Jingwei & Liao, Gaoliang & Zhang, Feng & Leng, Erwei & Han, Dandan & Hu, Wenyu, 2020. "A review on heat enhancement in thermal energy conversion and management using Field Synergy Principle," Applied Energy, Elsevier, vol. 257(C).
    5. Zhang, Rongchun & Xu, Quanyong & Fan, Weijun, 2018. "Effect of swirl field on the fuel concentration distribution and combustion characteristics in gas turbine combustor with cavity," Energy, Elsevier, vol. 162(C), pages 83-98.
    6. Jiaqiang, E & Zhao, Xiaohuan & Xie, Longfu & Zhang, Bin & Chen, Jingwei & Zuo, Qingsong & Han, Dandan & Hu, Wenyu & Zhang, Zhiqing, 2019. "Performance enhancement of microwave assisted regeneration in a wall-flow diesel particulate filter based on field synergy theory," Energy, Elsevier, vol. 169(C), pages 719-729.
    7. Kasaeian, Alibakhsh & Kouravand, Amir & Vaziri Rad, Mohammad Amin & Maniee, Siavash & Pourfayaz, Fathollah, 2021. "Cavity receivers in solar dish collectors: A geometric overview," Renewable Energy, Elsevier, vol. 169(C), pages 53-79.
    8. E, Jiaqiang & Luo, Bo & Han, Dandan & Chen, Jingwei & Liao, Gaoliang & Zhang, Feng & Ding, Jiangjun, 2022. "A comprehensive review on performance improvement of micro energy mechanical system: Heat transfer, micro combustion and energy conversion," Energy, Elsevier, vol. 239(PE).

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