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Thermal stack airflows inside the solar chimney with discrete heat sources: Reversal flow regime defined by chimney inclination and thermal Rayleigh number

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

Abstract

Present work numerically and theoretically investigates the fluid flow and heat transfer in an inclined solar chimney induced by thermal buoyancy within a range of thermal Rayleigh numbers (Ra) and chimney inclination angles (α). Transport paths of fluid and heat were visualized by streamlines and heatlines, respectively. Backflow could be observed in the solar chimney when Ra increases beyond a certain value, and it directly paralyses the ventilation of the chimney. Numerical results further demonstrate that the larger the inclination angle α is, the smaller the corresponding critical Ra number of the reverse flow occurs at the glass side is. The larger the inclination angle α is, the greater Nusselt (Nu) value of the absorber wall is, while its increment rate decreases gradually with the increase of the inclination angle α, when thermal Ra is maintained. As α varies from 30° to 90°, corresponding critical Ra for reversal flows gradually decreases; furthermore, these critical values obtained by the theoretical solutions were higher than those from simulation. Volume flow rates increase positively with Ra when α is no more than 30°; however, they increase initially and then decline with Ra when α is no less than 45°. In order to enhance ventilation performance, a solar chimney flush attached with discrete heating sources on the glazing wall is proposed. The numerical results indicated that modified inclined solar chimney with discrete heating sources could enhancing its ventilation performance by preventing reverse flow occurring in the channel. Our investigations also showed that the optimal inclination angle for maximum volume flow rate heavily depends on Ra. This research could provide necessary technical support and guidance for solar energy utilization and building energy conservation through air channel in building envelopes.

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  • 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.
  • Handle: RePEc:eee:renene:v:163:y:2021:i:c:p:342-356
    DOI: 10.1016/j.renene.2020.08.128
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    References listed on IDEAS

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    1. 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.
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    Cited by:

    1. 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).
    2. Bai, Yufu & Long, Tianhe & Li, Wuyan & Li, Yongcai & Liu, Shuli & Wang, Zhihao & Lu, Jun & Huang, Sheng, 2022. "Experimental investigation of natural ventilation characteristics of a solar chimney coupled with earth-air heat exchanger (SCEAHE) system in summer and winter," Renewable Energy, Elsevier, vol. 193(C), pages 1001-1018.
    3. Chi, Fang'ai & Liu, Yang & Yan, Jianxiong, 2021. "Integration of Radiative-based air temperature regulating system into residential building for energy saving," Applied Energy, Elsevier, vol. 301(C).

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