A wind tunnel study of wind-driven airing through open doors

Hayati, Abolfazl; Mattsson, Magnus; Sandberg, Mats

doi:10.1080/14733315.2018.1435027

Cited by 3 publications

(3 citation statements)

References 35 publications

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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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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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“…On the other hand single sided ventilation is in general much less than cross ventilation. For the same object the relation between cross ventilation and single sided ventilation has been studied in wind tunnel tests reported in Hayati et al (2018). Fig.…”

Section: Assessment Of the Potential For Cross Ventilationmentioning

confidence: 99%

The drag force distribution within regular arrays of cubes and its relation to cross ventilation – Theoretical and experimental analyses

Buccolieri

Sandberg

Wigö

et al. 2019

Journal of Wind Engineering and Industrial Aerodynamics

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A novel set of wind tunnel measurements of the drag force and its spatial distribution along aligned arrays of cubes of height H and planar area index λp (air gap between cubes) equal to 0.028 (5H) to 0.69 (0.2H) is presented and analysed. Two different types of measurements are compared: one type where the drag force is obtained using the standard load cell method, another type where the drag force is estimated by measuring the pressure difference between windward and the leeward façades. Results show that the drag force is nearly uniformly distributed for lower λp (0.028 and 0.0625), it decreases up to 50% at the second row for λp=0.11, and it sharply decreases for larger λp (from 0.25 to 0.69) where the force mostly acts on the first row. It follows that for the lowest λp the drag force typically formulated as a drag area corresponds to the total frontal area of the array, whereas for large λp the drag area corresponds to the area of the first row. By assessing the driving pressure for ventilation from the drag force, the analysis is extended to estimate the cross ventilation as an example of application of this type of measurements.

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“…The vertical openings were chosen in order to study their effect on and interaction with the simulated upstream atmospheric boundary layer and the building surface pressure distribution. While there have been studies that investigated the effect of the relative position of single openings on cross ventilation [9,11,20], experimental investigations of vertical openings along the full height of the building remain limited [41][42][43].…”

Section: Tel +44 1792 295514mentioning

confidence: 99%

Experimental investigation of the atmospheric boundary layer flow past a building model with openings

Μανωλέσος

Gao

Bouris

2018

Building and Environment

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As modern building design moves towards more sustainable solutions the use of natural ventilation is one of the options considered to improve indoor air quality and to minimize the energy cost of the buildings. The present cross-ventilation study is an experimental investigation of the atmospheric boundary layer flow past a cubic building model with vertical openings. Wind tunnel experiments were performed for two different simulated upstream boundary layer conditions and for two different cube options (with and without openings). Pressure measurements on the building model surface are in very good agreement with benchmark measurements. Stereo Particle Image Velocimetry measurements were performed to examine the effect of both the upstream condition and the openings. It is found that both conditions significantly alter the pressure and flow structure around the building model. Ventilation rate is estimated using two methods, the orifice equation and the measured velocity profile in the vicinity of the apertures. The comparison shows that the orifice equation overpredicts the ventilation rate and the effect of the upstream boundary layer. All data in the present report are freely available for validation purposes.

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A wind tunnel study of wind-driven airing through open doors

Cited by 3 publications

References 35 publications

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

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

The drag force distribution within regular arrays of cubes and its relation to cross ventilation – Theoretical and experimental analyses

Experimental investigation of the atmospheric boundary layer flow past a building model with openings

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