Wind-driven natural ventilation in a low-rise building: A Boundary Layer Wind Tunnel study

Tecle, Amanuel; Bitsuamlak, Girma; Jiru, Teshome Edae

doi:10.1016/j.buildenv.2012.08.026

Cited by 42 publications

(12 citation statements)

References 19 publications

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“…Through calculation, the results indicate that value of ΔCp increases when opening ratio decreases. The contour in Figure 7 is in great agreement with results obtained by Amanuel Tecle [25].…”

Section: Velocity and Pressuresupporting

confidence: 89%

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Effect of Opening Size on Wind-Driven Cross Ventilation

Moey

Sing

Tai

et al. 2021

IJIE

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The opening size is important to the ventilation of building because various opening sizes affects the ventilation performance for building. Therefore, the objective of this study is to investigate the effect of opening size on indoor airflow characteristics of naturally ventilated building model. The numerical simulation with steady RANS equations was used. A total of six different opening ratios, namely 4:1, 2:1, 1:1, 1:2, 4:9 and 1:4 were considered in this study. The results of mesh independence study and model validation were also in good agreement with previous study. The simulation results show that velocity and pressure of the indoor air, ventilation rate, and pressure coefficient are highly dependent on the opening ratio. The velocity and pressure contour indicate that the lower the opening ratio, the higher the velocity and subsequently lower pressure inside the building. In addition, the pressure coefficient and ventilation rate are also increased as the opening ratio decreases. Besides, the results indicate that percentage increase in ventilation rate of opening ratio 4:1 and 2:1, 2:1 and 1:1, and 1:1 and 1:2 is higher than those of opening ratio for 1:2 and 4:9, 4:9 and 1:4. The study concluded that pairing a large outlet and small inlet leads to increase in better ventilation rate for building.

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Section: Velocity and Pressuresupporting

confidence: 89%

“…According to Amanuel Tecle, the lower the opening ratio, the higher the pressure drop, ΔCp inside the building model [25]. Through calculation, the results indicate that value of ΔCp increases when opening ratio decreases.…”

Section: Velocity and Pressurementioning

confidence: 95%

Effect of Opening Size on Wind-Driven Cross Ventilation

Moey

Sing

Tai

et al. 2021

IJIE

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“…Lo and Novoselac [46] provide measurements in a multi-zone test building that, besides façade pressures, also includes wind properties, airflow through small window openings, and tracer-gas concentrations. A church typology is considered by Hayati et al [47], while Tecle et al [48] evaluate a low-rise building with different openings sizes and locations, room compartmentalization, and wind directions, measuring both ventilation rate and discharge coefficients. Extensive measurements for cross-ventilation in a sheltered building are presented by Shirzadi et al [49], which can be used for the validation of CFD numerical models.…”

Section: State Of the Art In Wind-driven Natural Ventilation Investigationsmentioning

confidence: 99%

Using CFD to Evaluate Natural Ventilation through a 3D Parametric Modeling Approach

et al. 2021

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Predicting building air change rates is a challenge for designers seeking to deal with natural ventilation, a more and more popular passive strategy. Among the methods available for this task, computational fluid dynamics (CFD) appears the most compelling, in ascending use. However, CFD simulations require a range of settings and skills that inhibit its wide application. With the primary goal of providing a pragmatic CFD application to promote wind-driven ventilation assessments at the design phase, this paper presents a study that investigates natural ventilation integrating 3D parametric modeling and CFD. From pre- to post-processing, the workflow addresses all simulation steps: geometry and weather definition, including incident wind directions, a model set up, control, results’ edition, and visualization. Both indoor air velocities and air change rates (ACH) were calculated within the procedure, which used a test house and air measurements as a reference. The study explores alternatives in the 3D design platform’s frame to display and compute ACH and parametrically generate surfaces where air velocities are computed. The paper also discusses the effectiveness of the reference building’s natural ventilation by analyzing the CFD outputs. The proposed approach assists the practical use of CFD by designers, providing detailed information about the numerical model, as well as enabling the means to generate the cases, visualize, and post-process the results.

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“…However, these factors are being considered by architects since the beginning of human civilization, but their effect through proper scientific experiments are being used for the last few decades. Generally, ventilation effects are investigated with the help of wind tunnels through model testing experimentally [3][4][5].Tecle et al [6]conducted experiments to investigate wind-driven ventilation for various door window positions and different percentages of door window openings. Single wall window configuration crossed flow window configuration and adjacent wall window configuration cases are investigated by them for 36 different wind directions.…”

Section: Introductionmentioning

confidence: 99%

Impact of Internal Wall Barriers on Airflow Pattern in Natural Cross-Ventilation of the Common Houses in Bhubaneswar City, India

2023

jjmie

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Common walls between houses are a major reason for improper ventilation in apartment buildings. They make a compulsion for improper positioning of doors/windows. The shape of the house also affects the airflow distribution patterns inside the house. In this work, the effect of various shapes of the house on the ventilation inside the rooms is investigated with a cross-flow ventilation configuration, where the total floor area of the house is maintained as 1000 square feet. Moreover, work also has been performed to investigate the airflow inside a square-shaped house with different door/window configurations for various inlet airflow directions. Besides that, the impact of inlet airflow velocity on the ventilation process has also been investigated. From the investigation, it has been observed that with an increase in air volume flow rate, the area covered with low-velocity air (< 1 m/s) decreases and the area covered with high-velocity air ( > 2 m/s) increases irrespective of the shape of the house but does not follow any pattern for the comfort condition airflow velocity. The airflow pattern is not changed significantly with increase in inlet airflow velocity, but the airflow velocity regions are changed significantly. For a square shape house, 78% area is covered with a low air velocity region (< 1 m/s) is the highest with N & E door/window configuration. 62% area covered with high air velocity region (> 2 m/s) is the highest with N & S door/window configuration. 26% area covered with comfort flow condition (between 1-2 m/s) is the highest with N & S door/window configuration.

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Wind-driven natural ventilation in a low-rise building: A Boundary Layer Wind Tunnel study

Cited by 42 publications

References 19 publications

Effect of Opening Size on Wind-Driven Cross Ventilation

Effect of Opening Size on Wind-Driven Cross Ventilation

Using CFD to Evaluate Natural Ventilation through a 3D Parametric Modeling Approach

Impact of Internal Wall Barriers on Airflow Pattern in Natural Cross-Ventilation of the Common Houses in Bhubaneswar City, India

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