Comparison of analysis methods for wind-driven cross ventilation through large openings

Gautam, Khem Raj; Rong, Li; Zhang, Guoqiang; Abkar, Mahdi

doi:10.1016/j.buildenv.2019.02.009

Cited by 20 publications

(9 citation statements)

References 25 publications

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“…The case without louvers was also performed. In the previous research (Gautam et al 2019) of the simplified model with the orifice equation, the perpendicular approaching airflow towards openings can cause the largest deviation. To evaluate the quality of the simplified model for predicting cross-ventilation capacity in the worst condition, the perpendicular approaching airflow was applied to perform CFD simulations.…”

Section: Evaluation Of Cross Ventilationmentioning

confidence: 92%

“…Based on a mass balance of the airflow within the cross-ventilation building, the ventilation rate Q is calculated by integrating the normal velocity at all openings on building facades (Jiang and Chen 2001;Gautam et al 2019), as shown in Equation (4).…”

Section: Coupled Indoor and Outdoor Airflow Modelmentioning

confidence: 99%

“…A common method to reduce the deviation in the simplified engineering model is applying the adaptive discharge coefficient C d * rather than the constant C d in calculating ventilation rate Q by orifice equation (Gautam et al 2019;Kurabuchi et al 2004;Ohba et al 2004). Many parameters can affect C d , such as the opening area, wind velocity, wind direction, location of the opening on the building surface, indoor partitions and envelope leakage (Karava, Stathopoulos, and Athienitis 2004).…”

Section: Relative Deviation ð%þmentioning

confidence: 99%

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Numerical study of wind environment of a low-rise building with shading louvers: sensitive analysis and evaluation of cross ventilation

Zheng

Tao

2020

Journal of Asian Architecture and Building Engineering

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Shading louvers are widely used in buildings to protect the indoor environment from excessive heat gain, especially in hot climatic regions. However, few studies mentioned their influences on wind characteristics. As a type of external components on building facades, shading louvers play an important role in wind-induced physical fields, such as wind pressure distribution and airflow pattern. The purposes of this paper are to analyse the impact of computational parameters on simulation results and evaluate the cross-ventilation capacity of a low-rise building with shading louvers. The rotation angle of shading louvers is considered. The simplified engineering model and the coupled indoor and outdoor airflow model are introduced to perform cross-ventilation evaluation. The sensitive analysis shows that the turbulence model has the greatest impact on numerical results. The evaluation of cross ventilation shows that the simplified model fails to quantify the cross-ventilation capacity for some cases. Based on the coupled airflow model, the largest reduction of ventilation rate is up to 66.6%. This study has performed the first sensitive analysis for airflow fields around the building with shading louvers, which provides a detailed simulation guidelines. The results of cross-ventilation capacity influenced by the shading louvers is helpful for ventilation design.

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Section: Evaluation Of Cross Ventilationmentioning

confidence: 92%

Section: Coupled Indoor and Outdoor Airflow Modelmentioning

confidence: 99%

Section: Relative Deviation ð%þmentioning

confidence: 99%

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Numerical study of wind environment of a low-rise building with shading louvers: sensitive analysis and evaluation of cross ventilation

Zheng

Tao

2020

Journal of Asian Architecture and Building Engineering

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“…Although wind tunnel simulations can objectively and realistically observe the details of changes of air flowing through the observation object, their high experimental costs, limited simulation range, and physical model accuracy requirements limit the popularity of this method. e CFD method is suitable for small-scale, high-resolution fluid simulations [27][28][29]. CFD is often used for industrial component design, building structure design, urban planning environment prediction, pollutant diffusion simulation, and the like.…”

Section: Introductionmentioning

confidence: 99%

A Least Cumulative Ventilation Cost Method for Urban Ventilation Environment Analysis

Xie

Liu

2020

Complexity

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The correct urban building layout is an important influencing factor in urban ventilation, and the heat island effect has become an important factor affecting the quality of urban life. Optimization of the urban building layout can play a role in mitigating the heat island effect. The traditional ventilation corridor analysis method, based on a least-cost path analysis, can only generate a few main ventilation corridors. It is difficult to obtain global ventilation results covering the whole study area using this method of analysis. On the basis of urban morphology and a least-cost path analysis, this study proposes a “least cumulative ventilation cost” method for analyzing urban ventilation. Taking Wuhan downtown as a research area, the urban ventilation environment under different wind directions and seasons was analyzed. This method can effectively express the ventilation conditions throughout the whole study area and can simultaneously express the quality of the generated corridors effectively. The results show that Wuhan has three levels of ventilation corridor. Moreover, the ventilation conditions in Wuchang (Wuchang, Qingshan, and Hongshan) are better than those in Hankou (Qiaokou, Jianghan, and Jiang’an).

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“…Cross-ventilation, as a most common form of natural ventilation, is known to be directly linked to the urban ventilation, wind distribution around buildings, and building arrangements (Aflaki et al, 2015;Gautam et al, 2019;Kotani et al, 2009). Cross-ventilation can be an effective method for improving the building energy saving (Abdullah and Wang, 2012;Guo et al, 2015;Li et al, 2016;Mochida et al, 2006Mochida et al, , 2005 and indoor thermal comfort (Hesaraki et al, 2015;Mochida et al, 2005;Prakash and Ravikumar, 2015).…”

Section: Introductionmentioning

confidence: 99%

Experimental study on cross-ventilation of a generic building in highly-dense urban areas: Impact of planar area density and wind direction

Shirzadi

Tominaga

Mirzaei

2020

Journal of Wind Engineering and Industrial Aerodynamics

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This study presents the experimental results on cross-ventilation in a generic low-rise building placed in highly-dense urban configurations. Flow visualization studies were conducted by utilization of a smoke generator in order to investigate the nature of the flow pattern inside and around the cross-ventilated building. Moreover, distribution of the wind surface pressure coefficients over windward and leeward façades and internal walls of the target building were measured using a pressure tap system. Furthermore, the airflow rate crossing through the openings was measured using a tracer gas method. Different building configurations, representing highly-dense urban areas, as well as different wind angles were investigated in this study Surprisingly, the experimental results reveal a noticeable difference between the mechanism of cross-ventilation in moderately-dense and highly-dense buildings arrangements. A clear leeward jet with a highly-transient nature can be observed, which is generated due to a leeward vortex formed by the target and downstream buildings. As another novel finding of this study, the crossventilation is understood to be highly transient in highly-dense urban areas with a strong periodic fresh air pulsation through the windward and leeward openings. This behavior is fundamentally far from the steady state models considered for such cross-ventilation scenarios in literature.

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Comparison of analysis methods for wind-driven cross ventilation through large openings

Cited by 20 publications

References 25 publications

Numerical study of wind environment of a low-rise building with shading louvers: sensitive analysis and evaluation of cross ventilation

Numerical study of wind environment of a low-rise building with shading louvers: sensitive analysis and evaluation of cross ventilation

A Least Cumulative Ventilation Cost Method for Urban Ventilation Environment Analysis

Experimental study on cross-ventilation of a generic building in highly-dense urban areas: Impact of planar area density and wind direction

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