Performance evaluation of single-sided natural ventilation for generic building using large-eddy simulations: Effect of guide vanes and adjacent obstacles

Arinami, Yuki; Akabayashi, Shin-ichi; Tominaga, Yoshihide; Shen, Jun

doi:10.1016/j.buildenv.2019.01.021

Cited by 32 publications

(16 citation statements)

References 43 publications

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“…The results also emphasize that the spatiotemporal variability of the wind has important effects on thermal exposure in urban areas [48,49]. The effects on thermal exposure of the complexity of turbulence in street canyons [35,50] as well as in cross-ventilated building areas [51][52][53] have been particularly difficult to quantify in the absence of information concerning wind velocity components in street canyons. In urban canyons without trees, only the primary vortex with its leeward side near the overheated surfaces and the windward side near shaded surfaces has been modelled with any regularity, following the description that appears in [54].…”

Section: Public Placesmentioning

confidence: 94%

High-Resolution Modelling of Thermal Exposure during a Hot Spell: A Case Study Using PALM-4U in Prague, Czech Republic

et al. 2021

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The modelling of thermal exposure in outdoor urban environments is a highly topical challenge in modern climate research. This paper presents the results derived from a new micrometeorological model that employs an integrated biometeorology module to model Universal Thermal Climate Index (UTCI). This is PALM-4U, which includes an integrated human body-shape parameterization, deployed herein for a pilot domain in Prague, Czech Republic. The results highlight the key role of radiation in the spatiotemporal variability of thermal exposure in moderate-climate urban areas during summer days in terms of the way in which this directly affects thermal comfort through radiant temperature and indirectly through the complexity of turbulence in street canyons. The model simulations suggest that the highest thermal exposure may be expected within street canyons near the irradiated north sides of east–west streets and near streets oriented north–south. Heat exposure in streets increases in proximity to buildings with reflective paints. The lowest heat exposure during the day may be anticipated in tree-shaded courtyards. The cooling effect of trees may range from 4 °C to 9 °C in UTCI, and the cooling effect of grass in comparison with artificial paved surfaces in open public places may be from 2 °C to 5 °C UTCI. In general terms, this study illustrates that the PALM modelling system provides a new perspective on the spatiotemporal differentiation of thermal exposure at the pedestrian level; it may therefore contribute to more climate-sensitive urban planning.

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Section: Public Placesmentioning

confidence: 94%

High-Resolution Modelling of Thermal Exposure during a Hot Spell: A Case Study Using PALM-4U in Prague, Czech Republic

et al. 2021

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“…The turbulence model choice relies on the detail level required to be detected and examined, and the differences between turbulence models complexity depend on the nature of the Navier–Stokes equation (Sodja and Podgornik, 2007). Recent works on wind-driven ventilation revealed that few studies applied the LES turbulence model, focused mainly on the validation and comparison of the accuracy with RANS models and wind tunnel experiments (Arinami et al , 2019; Cheng et al , 2003; Kato et al , 1992; Tominaga et al , 2008a; van Hooff et al , 2017). Although the accuracy and the reliability of LES in predicting the airflow characteristic compared to the other turbulence models (RANS), LES still time-consuming due to the massive computational required for the simulation (Cheng et al , 2003).…”

Section: Research Methodology and Proceduresmentioning

confidence: 99%

The impacts of introducing voids combinations on indoor ventilation performance in high-rise residential buildings

Laloui

Majid

Sanusi

2021

ECAM

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PurposeThe paper aims to investigate and evaluate the impacts of the voids combination as a passive design feature on wind-driven ventilation performance in high-rise residential building units. It proposes a series of building models and thereon indoor ventilation performance and outlining why and how these building models designed with architectural design features are important. This study aims to provide a comprehensive understanding of how natural ventilation as a passive cooling strategy in living units of high-rise residential buildings can be applied through improving the provision of the architectural design feature of voids configurations.Design/methodology/approachThe study was carried out through field measurements experiment and the computational fluid dynamics methods. A series of numerical simulations were carried out to calculate the indoor ventilation rate inside the case studies of the generated building models based on various variables such as horizontal voids type, size and wind directions.FindingsThe results indicate that the provision of a single-sided horizontal voids in building models can improve the indoor ventilation rate in units with cross ventilation mode up to 4 times, depending on wind direction and living unit location. The indoor ventilation performance in units located in models with single-sided horizontal voids is 17.54% higher than the units located in models without voids configuration. Furthermore, higher indoor ventilation performance was achieved in the case scenarios located at higher levels compared to the middle and lower levels in both horizontal voids types.Originality/valueThis study explores the application of voids combinations for natural ventilation performance, investigates the numerical simulation results and validates field measurements experiment data using CFD simulation.

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“…Consequently, several studies are concentrated on measuring, evaluating, and predicting this passive strategy, especially in recent years because of sustainable and energy demand goals [16,32]. Some emphasize either cross-or single-sided ventilation, investigating specific topics such as the impact of the building dimensions [33], internal divisions [34], multiple windows [35], sheltering [36,37], adjacent obstacles [38,39], wind exchangers [40], large openings [41], and a greenhouse with a wind tower [42]. Moreover, Dai et al [43] study air quality and virus propagation in interunit dispersion in multistory buildings.…”

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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Performance evaluation of single-sided natural ventilation for generic building using large-eddy simulations: Effect of guide vanes and adjacent obstacles

Cited by 32 publications

References 43 publications

High-Resolution Modelling of Thermal Exposure during a Hot Spell: A Case Study Using PALM-4U in Prague, Czech Republic

High-Resolution Modelling of Thermal Exposure during a Hot Spell: A Case Study Using PALM-4U in Prague, Czech Republic

The impacts of introducing voids combinations on indoor ventilation performance in high-rise residential buildings

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

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