Investigating the influence of neighbouring structures on natural ventilation potential of a full-scale cubical building using time-dependent CFD

King, Marco‐Felipe; Gough, Hannah; Halios, Christos; Barlow, Janet F.; Robertson, A.P.; Hoxey, R.P.; Noakes, Catherine

doi:10.1016/j.jweia.2017.07.020

Cited by 78 publications

(33 citation statements)

References 56 publications

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“…Indeed, the accuracy of natural ventilation potential is strongly dependent on the influence region chosen around the case study building. Few studies highlight the impact of the surrounding buildings on the predicted ventilation performance of a rectangular building (Cheung & Liu, 2011;Jiang & Chen, 2002;King et al, 2017;Ramponi, Blocken, De Coo, & Janssen, 2015;. In the previously cited works, the arrangement of surrounding buildings is well organized in simple configurations with regular or staggered alignments.…”

Section: Natural Ventilationmentioning

confidence: 99%

Challenges in the low-carbon adaptation of China’s apartment towers

Short

Jooho

Mottet

et al. 2018

Building Research & Information

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Low-carbon building retrofit will contribute to delivering China's policy to reduce carbon emissions. This paper proposes viable low-carbon adaptation strategies for a recurrent building type within the Hot Summer and Cold Winter (HSCW) zone. An existing 23-storey tower in Hangzhou is investigated within the context of a representative city environment. Indoor air temperatures and energy consumption were monitored across a typical floor and simulated in EnergyPlus. Outdoor and indoor airflow patterns were modelled in an advanced computational fluid dynamics (CFD) tool, FLUIDITY. Across a typical floor, observations and modelling show marked variations. Southfacing flats overheat significantly in summer largely due to solar radiation. External sun-shading structures are proposed and evaluated to counter summer overheating. An innovative wind catcher and exhaust-stack natural ventilation system is proposed to enhance indoor thermal comfort using natural ventilation. Modelling of this integrated ventilation system indicates that the proposed retrofit system will improve indoor thermal comfort even in the lower floors. The proposed building retrofit strategy is costed using locally established construction cost estimates. Predicted energy savings suggest that the adaptation strategy proposed is potentially viable with significant implications for policy-makers, developers, constructors and designers in this challenging climate zone in China.

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Section: Natural Ventilationmentioning

confidence: 99%

Challenges in the low-carbon adaptation of China’s apartment towers

Short

Jooho

Mottet

et al. 2018

Building Research & Information

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“…The convective velocity of the particle phase is assumed to be the same as the airflow in this study. However, wind flow in the real environments is transient, and even a steady wind condition gives transient vortex shedding in wind-tunnel/field experiments under certain configurations [69]. These transient flows are important, both for pollutant mixing and building ventilation.…”

Section: Configurationmentioning

confidence: 99%

Prediction of Wind Environment and Indoor/Outdoor Relationships for PM2.5 in Different Building–Tree Grouping Patterns

2018

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Airflow behavior and indoor/outdoor PM 2.5 dispersion in different building-tree grouping patterns depend significantly on the building-tree layouts and orientation towards the prevailing wind. By using a standard k-ε model and a revised generalized drift flux model, this study evaluated airflow fields and indoor/outdoor relationships for PM 2.5 resulting from partly wind-induced natural ventilation in four hypothetical building-tree grouping patterns. Results showed that: (1) Patterns provide a variety of natural ventilation potential that relies on the wind influence, and buildings that deflect wind on the windward facade and separate airflow on the leeward facade have better ventilation potential; (2) Patterns where buildings and trees form a central space and a windward opening side towards the prevailing wind offer the best ventilation conditions; (3) Under the assumption that transported pollution sources are diluted through the inlet, the aerodynamics and deposition effects of trees cause the lower floors of a multi-storey building to be exposed to lower PM 2.5 compared with upper floors, and lower indoor PM 2.5 values were found close to the tree canopy; (4) Wind pressure differences across each flat showed a poor correlation (R 2 = 0.059), with indoor PM 2.5 concentrations; and (5) Patterns with the long facade of buildings and trees perpendicular to the prevailing wind have the lowest indoor PM 2.5 concentrations.

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“…Urban roughness is heteogenous consisting of different type of surfaces (e.g. Antoniou et al, 2016;King et al, 2017;Vasaturo et al, 2018;Tolias et al, 2018). A change in surface roughness, such as exists at the edge of the city, or at the junction between the central business district (CBD) and an area of surrounding low-rise buildings, leads to a region of transitional flow as the turbulent boundary layer takes time to adapt to the new wall condition (e.g.…”

Section: Introductionmentioning

confidence: 99%

Turbulence and dispersion below and above the interface of the internal and the external boundary layers

Sessa

Xie

Herring

2018

Journal of Wind Engineering and Industrial Aerodynamics

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This study has looked at the development of the internal boundary layer (IBL) over a block array close to a sharp change in surface roughness and its effect on dispersion from a ground level source for ratios of the downstream distance to the roughness length of less than 300. This was done by comparing a Large-Eddy Simulation (LES) with inflow boundary conditions against a LES with inlet-outlet periodic boundary conditions and data from a wind tunnel experiment. In addition to established methods, an alternative approach based on the vertical Reynolds stress was used to evaluate the depth of the IBL as it developed over the array which enabled the location of the interface to be more clearly defined. It was confirmed that the IBL growth rate close to the change in surface roughness could be described by a power law profile, similar to the power law formula used in previous studies for a ratio of the downstream distance to the roughness length greater than 1000. An analysis of mean concentration and turbulent scalar fluxes suggested that the presence of the IBL constrained the vertical development of the plume from a ground level source and so led to trapping of material in the canopy layer.

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Investigating the influence of neighbouring structures on natural ventilation potential of a full-scale cubical building using time-dependent CFD

Cited by 78 publications

References 56 publications

Challenges in the low-carbon adaptation of China’s apartment towers

Challenges in the low-carbon adaptation of China’s apartment towers

Prediction of Wind Environment and Indoor/Outdoor Relationships for PM2.5 in Different Building–Tree Grouping Patterns

Turbulence and dispersion below and above the interface of the internal and the external boundary layers

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