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Research Article

The influence of envelope features on interunit dispersion around a naturally ventilated multi-story building

Dongjin Cui1Zhengtao Ai2( )Cheuk-ming Mak3Kenny Kwok4Peng Xue5
Shenzhen Key Laboratory of Built Environment Optimization, School of Architecture and Urban Planning, Shenzhen University, China
International Center for Indoor Environment and Energy, Technical University of Denmark, Denmark
Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, China
School of Civil Engineering, The University of Sydney, Australia
Beijing Key Laboratory of Green Built Environment and Energy Efficient Technology, Beijing University of Technology, China
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Abstract

This study examines the influence of building envelope features on interunit dispersion around multi-story buildings, when the presence of an upstream interfering building is also considered. Validated CFD methods in the steady-state RANS framework are employed. In general, the reentry ratios of pollutant from a source unit to adjacent units are mostly in the order of 0.1%, but there are still many cases being in the order of 1%. The influence of envelope features is dependent strongly on the interaction between local wind direction and envelope feature. In a downward dominated near-facade flow field, the presence of vertical envelope features forms dispersion channels to intensify the unidirectional spread. Horizontal envelope features help induce the dilution of pollutant to the main stream and weakens largely the vertical interunit dispersion. The large influences caused by the presence of envelope features extend the existing understanding of interunit dispersion based on flat-facade buildings.

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Building Simulation
Pages 1245-1253
Cite this article:
Cui D, Ai Z, Mak C-m, et al. The influence of envelope features on interunit dispersion around a naturally ventilated multi-story building. Building Simulation, 2018, 11(6): 1245-1253. https://doi.org/10.1007/s12273-018-0460-x

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Received: 02 May 2018
Revised: 07 June 2018
Accepted: 02 July 2018
Published: 18 July 2018
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018
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