Single-sided natural ventilation driven by wind pressure and temperature difference

Larsen, Tine Steen; Heiselberg, Per

doi:10.1016/j.enbuild.2006.07.012

Cited by 220 publications

(155 citation statements)

References 4 publications

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“…It is driven by wind or buoyancy, or -most often -a combination of both (e.g. [8][9][10][11][12][13]). In the past decades, a lot of research efforts contributed to the evaluation of the natural ventilation performance of buildings.…”

Section: Introductionmentioning

confidence: 99%

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CFD simulation of cross-ventilation for a generic isolated building: Impact of computational parameters

Ramponi

Blocken

2012

Building and Environment

450

271

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• Extensive literature review on numerical cross-ventilation studies in overview table.• Detailed sensitivity analysis for CFD simulations of a cross-ventilated building model.• The SST k-ω turbulence model shows the best agreement with PIV measurements.• The turbulent kinetic energy strongly influences the convergence and the results.• The prediction of the outdoor standing vortex largely affects the indoor airflow. AbstractAccurate CFD simulation of coupled outdoor wind flow and indoor air flow is essential for the design and evaluation of natural cross-ventilation strategies for buildings. It is widely recognized that CFD simulations can be very sensitive to the large number of computational parameters that have to be set by the user. Therefore, detailed and generic sensitivity analyses of the impact of these parameters on the simulation results are important to provide guidance for the execution and evaluation of future CFD studies. A detailed review of the literature indicates that there is a lack of extensive generic sensitivity studies for CFD simulation of natural cross-ventilation. In order to provide such a study, this paper presents a series of coupled 3D steady RANS simulations for a generic isolated building. The CFD simulations are validated based on detailed wind tunnel experiments with Particle Image Velocimetry. The impact of a wide range of computational parameters is investigated, including the size of the computational domain, the resolution of the computational grid, the inlet turbulent kinetic energy profile of the atmospheric boundary layer, the turbulence model, the order of the discretization schemes and the iterative convergence criteria. Specific attention is given to the problem of oscillatory convergence that was observed during some of these coupled CFD simulations. Based on this analysis, the paper identifies the most important parameters. The intention is to contribute to improved accuracy, reliability and evaluation of coupled CFD simulations for cross-ventilation assessment.

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Section: Introductionmentioning

confidence: 99%

“…[6,7,9,10,13,[19][20][21][22][23][24][25][26][27][28][29]), analytical and/or semiempirical formulae (e.g. [9][10][11]13,15,[30][31][32][33][34]), simulations with zonal and multizone network models (e.g.…”

Section: Introductionmentioning

confidence: 99%

CFD simulation of cross-ventilation for a generic isolated building: Impact of computational parameters

Ramponi

Blocken

2012

Building and Environment

450

271

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“…According to ASHRAE [13], in a cross-ventilated room, the values of are between 0.5 and 0.7 for perpendicular wind and 0.25 to 0.35 for diagonal wind. However, a study by Larsen [14] suggests that the value for diagonal wind is 0.48, but the opening area used in this study is only equal to 1% of the total area of the facade. In the case of a single-sided ventilation, the value is either 0.025 [15,16] or 0.02 [17].…”

Section: Empirical Modelsmentioning

confidence: 97%

“…There two reasons for inaccuracy: CFD simulation with the standard k-epsilon model is weak on airflow predictions on the leeward side, and Equation (4) is less accurate due to the introduction of overhang and wing walls. The Equation (4) is derived by Larsen [14] based on experiment on a flat façade model. …”

Section: Wind Direction and Ventilation Strategymentioning

confidence: 99%

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Coupled Outdoor and Indoor Airflow Prediction for Buildings Using Computational Fluid Dynamics (CFD)

et al. 2013

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Abstract:The objective of this study is to investigate the accuracy of Computational Fluid Dynamics (CFD) for simultaneously predicting the outdoor and indoor airflows of single-cell and multi-storey buildings. Empirical models and two existing wind tunnel experimental data are used for validation. This study found that coupled CFD simulations provide sufficiently accurate airflow predictions and, in cases of buildings with complex façade treatments, accurately accounts for changes in ventilation performance, which may be impossible using empirical models. This study concludes that coupled CFD simulations can generally be used to predict ventilation performance in small and large buildings.

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Vordimensionierung von Lüftungsöffnungen in Doppelfassaden

2022

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Doppelfassaden verbessern den Schallschutz bei natürlicherFassadenlüftung und bieten der Verschattung im Fassadenzwischenraum (FZR) einen Schutz vor hohen Windlasten. Bezüglich der natürlichen Lüftung ist jedoch zu beachten, dass die Luftströmungen zwei Fassadenebenen passieren müssen und die Luftwechselzahl nicht mit den Annahmen für einschalige Fassaden geplant werden kann. Die potenziell höheren Temperaturen im Fassadenzwischenraum erfordern zudem eine besondere Beachtung bei der Planung des sommerlichen Wärmeschutzes. An zehn Gebäuden in Hamburg mit Korridor-Doppelfassaden und Kastenfenster-Doppelfassaden wurden Klimadaten erfasst und Luftwechselmessungen vorgenommen. Anhand dieser Daten wurde ein Berechnungsansatz des Außenluftwechsels erstellt und in transienten thermischen Gebäudesimulationen angewandt. Erstellt wurde eine Methode, mit der in frühen Planungsphasen schnell und ohne Softwareanwendung die erforderliche Größe der Lüftungsöffnungen bestimmt werden kann.

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Single-sided natural ventilation driven by wind pressure and temperature difference

Cited by 220 publications

References 4 publications

CFD simulation of cross-ventilation for a generic isolated building: Impact of computational parameters

CFD simulation of cross-ventilation for a generic isolated building: Impact of computational parameters

Coupled Outdoor and Indoor Airflow Prediction for Buildings Using Computational Fluid Dynamics (CFD)

Vordimensionierung von Lüftungsöffnungen in Doppelfassaden

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