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Thermal driven natural convective flows inside the solar chimney flush-mounted with discrete heating sources: Reversal and cooperative flow dynamics

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  • Ren, Xiu-Hong
  • Liu, Run-Zhe
  • Wang, Yun-He
  • Wang, Lin
  • Zhao, Fu-Yun

Abstract

Fluid flow and heat transfer mechanism in a solar chimney induced by thermal buoyancy within a range of Ra numbers are reported by numerical and experimental investigations. The transport paths followed respectively by air and heat are visualized by streamlines and heatlines. Numerical results demonstrate that the reverse flow not only slows down the volume flow rate but also accelerates backflow presented in the solar chimney when Ra increases beyond a certain value, which makes the solar chimney lost its role of ventilation. In order to suppress the reverse flow and enhance ventilation performance, a solar chimney with multiple discrete sources flush attached the glazing wall is proposed. The effects of the sizes, positions, and numbers of those discrete heat sources on the system heat transfer rate and volume flow rate are discussed. After comparing with conventional solar chimney, the modified solar chimney with discrete heat source of height D0 = 1 and position S0 = 1 could perform better, not only preventing reverse flow but also enhancing the ventilation performance. The results obtained by the lab experimental measurements were agreed well with former numerical simulations. Temperature distributions along the heated wall for different heat input at ambient temperature illustrate the temperatures on the heated wall do not increase linearly and even drop near the top exit. This research could be significant for solar energy utilization and building energy conservation.

Suggested Citation

  • Ren, Xiu-Hong & Liu, Run-Zhe & Wang, Yun-He & Wang, Lin & Zhao, Fu-Yun, 2019. "Thermal driven natural convective flows inside the solar chimney flush-mounted with discrete heating sources: Reversal and cooperative flow dynamics," Renewable Energy, Elsevier, vol. 138(C), pages 354-367.
    • Handle: RePEc:eee:renene:v:138:y:2019:i:c:p:354-367
    DOI: 10.1016/j.renene.2019.01.090
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    References listed on IDEAS

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    Cited by:

    1. Zhang, Haihua & Yang, Dong & Tam, Vivian W.Y. & Tao, Yao & Zhang, Guomin & Setunge, Sujeeva & Shi, Long, 2021. "A critical review of combined natural ventilation techniques in sustainable buildings," Renewable and Sustainable Energy Reviews, Elsevier, vol. 141(C).
    2. Li, Xue & Sun, Yanyi & Liu, Xiao & Ming, Yang & Wu, Yupeng, 2024. "Development of a comprehensive method to estimate the optical, thermal and electrical performance of a complex PV window for building integration," Energy, Elsevier, vol. 294(C).
    3. Zhang, Haihua & Tao, Yao & Zhang, Guomin & Li, Jie & Setunge, Sujeeva & Shi, Long, 2022. "Impacts of storey number of buildings on solar chimney performance: A theoretical and numerical approach," Energy, Elsevier, vol. 261(PA).
    4. Ren, Xiu-Hong & Wang, Lei & Liu, Run-Zhe & Wang, Lin & Zhao, Fu-Yun, 2021. "Thermal stack airflows inside the solar chimney with discrete heat sources: Reversal flow regime defined by chimney inclination and thermal Rayleigh number," Renewable Energy, Elsevier, vol. 163(C), pages 342-356.
    5. Ren, Xiu-Hong & Wang, Peng-Lei & Zhang, Chun-Xiao & Song, Yong-Juan & Shang, Jin & Wang, Lin & Zhao, Fu-Yun, 2024. "Heat removal and ventilation limitations of the solar chimney attached with a built enclosure: Correlations of thermal Rayleigh numbers, port arrangements and discrete heating elements," Renewable Energy, Elsevier, vol. 221(C).

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