Air change rates driven by the flow around and through a building storey with fully open or tilted windows: An experimental and numerical study

Teppner, Renate; Langensteiner, Bernd; Meile, Walter; Brenn, Günter; Kerschbaumer, Sybill

doi:10.1016/j.enbuild.2014.07.020

Cited by 17 publications

(11 citation statements)

References 23 publications

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“…Evola & Popov, (2006) examined the wind-driven natural ventilation of a cubic building using standard k-ε and RNG turbulence models, while Gebremedhin & Wu, (2003) assessed flow field in a multiple-occupancy ventilated space using a microclimate CFD model. Moreover, Teppner et al, (2014) assessed the air change rate (AHC) of a series of open and tilted windows in a naturally ventilated isolated residential building. Bangalee, Lin, & Miau, (2012) compared single-sided and cross wind-driven ventilations within an isolated one-storey building using k-ε turbulence model, and Mochida et al, (2006) studied cross-ventilation cooling effect around a building by development of a microclimate model.…”

Section: Methodsmentioning

confidence: 99%

Wind-driven ventilation improvement with plan typology alteration: A CFD case study of traditional Turkish architecture

Aydin

Mirzaei

2016

Build. Simul.

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Section: Methodsmentioning

confidence: 99%

Wind-driven ventilation improvement with plan typology alteration: A CFD case study of traditional Turkish architecture

Aydin

Mirzaei

2016

Build. Simul.

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“…As a result, the velocity of the flow in part that is tangent to the surface falls close to zero [15,20,22]. However, due to difficulty in creating ABL flow for the experiment, a simulation with a uniform velocity profile is performed so as to compare consistently with measurement results by varying the wind speed.…”

Section: Sensitivity Analysismentioning

confidence: 99%

“…Reduced scale models display good repeatability in the measurements but the problem is lean possibility to perfectly imitate phenomena of a full-scale building [16]. Walker et al [19] and Teppner et al [20] adopted reduced-scale models to perform experiments, validate the numerical models, and understand phenomena related to a naturally ventilated building. CFD modeling could be utilized to imitate a full-scale experiment, but this process requires validation by a full-or reduced-scale measurement, and data for these indoor environmental parameters for the validation of the model remain scarce [16].…”

mentioning

confidence: 99%

“…CFD was exploited by Stavrakakis et al [4] and Shetabivash [21], and the CFD model was verified using available climatic and experimental data to investigate the effect of the opening on the airflow characteristics of the room and suggest optimum design variables for good ventilation. Additionally, studies have been conducted based on CFD, full-scale and reduced-scale measurements and have focused on natural ventilation through windows with varying factors, such as their types, opening angles, dimensions, opening configuration, building orientations, air velocities, and temperature differences [12][13][14][15][17][18][19][20][21][22][23][24]. Despite the abundance of research, most of the studies on the design and optimization of window openings for better ventilation and thermal comfort have been implemented for residential buildings, and minimal research has focused on industrial windows.…”

mentioning

confidence: 99%

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Computational and Experimental Investigation for an Optimal Design of Industrial Windows to Allow Natural Ventilation during Wind-Driven Rain

Prueksakorn

Piao²,

Ha³

et al. 2015

Sustainability

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Abstract:With an increased awareness of sustainability issues, natural ventilation has become an elegant method for reducing the costs and environmental effects of the energy that is used to maintain comfortable indoor air quality rather than using mechanical ventilation. The windows in many industrial buildings are continuously open to exhaust pollutants and intake fresh air. Though windows are functional and efficient for natural ventilation, rainwater is able to penetrate through the windows during wind-driven rain. For industries in which the moisture content affects the quality of the product, the intrusion of a large amount of rainwater through windows must be prevented without compromising the effective ventilation. The aim of this research is to determine an innovative design for windows to accomplish the optimum of high ventilation and low rain penetration. For this purpose, windows are variously innovated and tested in full-scale measurements, reduced-scale wind-tunnel measurements and computational fluid dynamics (CFD). An artificial rain and wind velocity to mimic the average of the maximum values in Korea are created. The maximum reduction in rain OPEN ACCESS Sustainability 2015, 7 10500 penetration of over 98% compared to basic 90° open windows is attained with only a 4%-9% decrement of ventilation efficiency in the two recommended designs.

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“…As a result, the quality of air decreases and larger energy is consumed. Natural ventilated building, relying on difference in temperature and wind induced pressure is the most common form of natural ventilation [1].…”

Section: Introductionmentioning

confidence: 99%

Numerical estimation of natural ventilation of cubical urban arrays with different packing density

et al. 2017

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Abstract.In an urban environment where buildings are closely packed, natural ventilation performance is undesirably disturbed by the effect of surrounding buildings. Cross-ventilation refers to the regulation of air within a building, which is essential in providing good air quality and thermal comfort for the occupants. Thus, this study focuses on the impact of packing density on ventilation rate of cross-ventilated buildings. The numerical estimation is performed by means of computational fluid dynamic (CFD) using the Reynolds Averaged Navier-Stokes (RANS) with RNG k -ε (RNG) turbulence model. Three configurations of simplified generic cubes which are regularly aligned with packing density of 25%, 35%, and 50% were considered. Velocity distribution around and inside the buildings as well as the ventilation rate are analysed. The case with packing density of 25% exhibits a reduction of 90% in the ventilation rate compared to the isolated case and continues to decrease as the packing density increase up to 35%. However, further increase of packing density up to 50%, slightly increases the ventilation rate. Hence, the result of this study imposed that surrounding buildings have a substantial influence on ventilation performance of cross-ventilated buildings.

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Air change rates driven by the flow around and through a building storey with fully open or tilted windows: An experimental and numerical study

Cited by 17 publications

References 23 publications

Wind-driven ventilation improvement with plan typology alteration: A CFD case study of traditional Turkish architecture

Wind-driven ventilation improvement with plan typology alteration: A CFD case study of traditional Turkish architecture

Computational and Experimental Investigation for an Optimal Design of Industrial Windows to Allow Natural Ventilation during Wind-Driven Rain

Numerical estimation of natural ventilation of cubical urban arrays with different packing density

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