The Effect of Airflow Guiding Components on Effective Ventilation Rates in Single-Sided Ventilation Applications

Authors

Nima Najafi Ziarani, MaREI, The SFI Research Centre for Energy, Climate and Marine, Ireland; School of Mechanical, Electrical, and Process Engineering, Munster Technological University, Bishopstown, Cork, IrelandFollow
Malcolm Cook, School of Architecture, Building and Civil Engineering, Loughborough University, Epinal Way, Loughborough, Leicestershire, LE11 3TU, United Kingdom
Paul D. O’Sullivan, MaREI, The SFI Research Centre for Energy, Climate and Marine, Ireland; School of Mechanical, Electrical, and Process Engineering, Munster Technological University, Bishopstown, Cork, IrelandFollow

ORCID

https://orcid.org/0000-0002-2674-5006

Document Type

Article

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 4.0 International License.

Disciplines

Civil and Environmental Engineering | Engineering | Transportation Engineering

Publication Details

International Journal of Ventilation. © 2023 The Author(s).

Abstract

Wind-driven single-sided ventilation (SSV) is present in many existing buildings across Europe, and with new near-zero energy building (NZEB) regulations for the refurbishment of the existing building stock, its attractiveness as a noninvasive, low-energy solution is set to continue. As a strategy, however, in addition to its air change rate capacity, the distribution of fresh air is an important evaluation criterion for its performance. Airflow guiding components located in the external opening that enhance the effectiveness of the wind-driven flow in ventilating the occupied zone could improve the quality of indoor environments. To our knowledge, the literature is sparse on the practical implications for ventilation when adopting guiding components such as louvres, an increasingly popular approach. In the present study, the performance of wind-dominant SSV was simulated using RNG k−ε and RSM CFD models, with and without louvres at three building orientations, for example, windward, parallel and leeward. The purpose of this study was to investigate whether louvres installed in the opening would improve both the effective ventilation rate and the penetration depth of the flow into the indoor space. The performance of SSV was evaluated using the age of air and interpreting the secondary air circulation inside the room affected by louvres. As a result of these investigations, a newly configured airflow guiding component was designed and compared to the other cases. Results show louvres can play a crucial role in controlling the secondary air circulation inside the room, and they could either improve or worsen the performance of SSV in terms of air-exchange efficiency. It was shown that in most cases, if louvres were the cause of incremental changes in turbulent intensity within the indoor space, then they are effective as an air-exchange efficiency improvement strategy.

Recommended Citation

Nima Najafi Ziarani, Malcolm Cook & Paul D. O’Sullivan (2023) The effect of airflow guiding components on effective ventilation rates in single-sided ventilation applications, International Journal of Ventilation, DOI: 10.1080/14733315.2023.2198793