Junli Zhou This email address is being protected from spambots. You need JavaScript enabled to view it.1, Yong Hua1, Yuan Xiao1, Cheng Ye1, Wei Yang2 

1 School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China
2 Faculty of Architecture, Building and Planning, The University of Melbourne, Melbourne, 3010, Australia


Received: August 1, 2020
Revised: October 25, 2020
Accepted: December 12, 2020

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Download Citation: ||https://doi.org/10.4209/aaqr.200383  

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Cite this article:

Zhou, J., Hua, Y., Xiao, Y., Ye, C., Yang, W. (2021). Analysis of Ventilation Efficiency and Effective Ventilation Flow Rate for Wind-driven Single-sided Ventilation Buildings. Aerosol Air Qual. Res. 21, 200383. https://doi.org/10.4209/aaqr.200383


HIGHLIGHTS

  • Effective flow rate is lower than ventilation flow rate through opening.
  • The influence factors of mixing coefficient include wind speed, opening area, etc.
  • The mixing coefficient reaches the maximum with centre opening.
  • An estimate value of mixing coefficient has been proposed for engineering design.
 

ABSTRACT


Natural ventilation can be categorized into single-sided ventilation and cross-ventilation. Based on the air flow mechanism of a single-sided wind-driven natural ventilation, the effective ventilation flow rates in buildings are different from the air flow rates through openings. The mixing coefficient or ventilation efficiency is defined by the ratio of these flow rates, indicating the effective ventilating ability of a single-sided ventilation, similar to the effect of penetration depth of fresh air. This paper provides a detailed analysis of ventilation effectiveness in a building with a single opening based on numerical simulations. The simulation was validated by a study of an existing case. By numerical calculation, the air flow rates through openings and the effective ventilation flow rates in buildings were compared. Effects of various influencing parameters, such as wind speed, opening location, opening area and aspect ratio of windward wall on ventilation efficiency were evaluated. An estimated mixing coefficient has been established by the modelling, which would be beneficial for the predication of the short-circuit ratio of ventilation rate through openings.


Keywords: Single-sided ventilation, Ventilation efficiency, Effective ventilation rate, Numerical simulation



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