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Enhancing solar chimney performance in urban tunnels: Investigating the impact factors through experimental and theoretical model analysis

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  • Huang, Youbo
  • Liu, Xi
  • Shi, Long
  • Dong, Bingyan
  • Zhong, Hua

Abstract

Efficient and sustainable ventilation in urban tunnels is crucial for combating air pollution and safeguarding human health. This study investigates the design factors impacting solar chimney performance in urban tunnels to optimize ventilation efficiency. Experimental trials analyzed the effects of blockage ratio, chimney height, and solar radiation on temperature distribution and ventilation rate. The results demonstrate that increased chimney height and solar radiation positively influence airflow velocity at the chimney outlet, enhancing ventilation. The temperature rise near absorber is higher than that closed to glazing wall. Temperature distribution within the chimney follows a distinctive horizontal two-piecewise semi-parabolic decay pattern, enabling accurate prediction of temperature profiles along the cavity depth. Novel analytical models predict temperature distribution, airflow velocity, and ventilation rate within the solar chimney system, aiding precise design and optimization. Remarkably, the blockage ratio has limited impact on ventilation rate, allowing for disregarding vehicle blockage effects in solar chimney design for urban tunnels. Matching chimney width to tunnel width and ensuring a relatively high chimney height are emphasized for optimal functionality. The study holds substantial implications for ventilation system design in urban environments, promoting healthier and more sustainable cities.

Suggested Citation

  • Huang, Youbo & Liu, Xi & Shi, Long & Dong, Bingyan & Zhong, Hua, 2023. "Enhancing solar chimney performance in urban tunnels: Investigating the impact factors through experimental and theoretical model analysis," Energy, Elsevier, vol. 282(C).
    • Handle: RePEc:eee:energy:v:282:y:2023:i:c:s0360544223017231
    DOI: 10.1016/j.energy.2023.128329
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    References listed on IDEAS

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    4. Sengupta, Ayan & Mishra, Dipti Prasad & Sarangi, Shailesh Kumar, 2022. "Computational performance analysis of a solar chimney using surface modifications of the absorber plate," Renewable Energy, Elsevier, vol. 185(C), pages 1095-1109.
    5. 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).
    6. Tao, Yao & Fang, Xiang & Chew, Michael Yit Lin & Zhang, Lihai & Tu, Jiyuan & Shi, Long, 2021. "Predicting airflow in naturally ventilated double-skin facades: theoretical analysis and modelling," Renewable Energy, Elsevier, vol. 179(C), pages 1940-1954.
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    9. Cheng, Xudong & Shi, Zhicheng & Nguyen, Kate & Zhang, Lihai & Zhou, Yong & Zhang, Guomin & Wang, Jinhui & Shi, Long, 2020. "Solar chimney in tunnel considering energy-saving and fire safety," Energy, Elsevier, vol. 210(C).
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