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

Journal article


Huang, Y., Liu, X., Shi, L., Dong, B. and Zhong, H. (2023). Enhancing solar chimney performance in urban tunnels: Investigating the impact factors through experimental and theoretical model analysis. Energy. 282, p. 128329. https://doi.org/10.1016/j.energy.2023.128329
AuthorsHuang, Y., Liu, X., Shi, L., Dong, B. and Zhong, H.
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.

Year2023
JournalEnergy
Journal citation282, p. 128329
PublisherElsevier
ISSN1873-6785
Digital Object Identifier (DOI)https://doi.org/10.1016/j.energy.2023.128329
Web address (URL)https://doi.org/10.1016/j.energy.2023.128329
Publication dates
Online13 Jul 2023
Publication process dates
Accepted02 Jul 2023
Deposited26 Feb 2024
Publisher's version
License
File Access Level
Open
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