Experimental study on shading effects on the wind-thermal environment of a 1:15 scaled building complex in autumn in Zhengzhou, China

IF 6.9 2区 工程技术 Q1 ENVIRONMENTAL SCIENCES
Qianru Chen , Zhengrong Li , Yongheng Du
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引用次数: 0

Abstract

The wind-thermal environment within a building complex is closely related to meteorological parameters, building complex morphology design and building complex surface temperature. Most existing studies ignored the shading effect between buildings, leading to significant differences in surface temperature and turbulence characteristics between building complexes and isolated buildings. Therefore, in this study, a 4 × 4 scaled building complex (scale 1:15) was constructed in Zhengzhou, China. Statistical analysis was employed to examine the impact of meteorological factors and building morphology on the wind-thermal environment. The results show that after airflow travels 6.7 m along the ventilation corridor, the power spectral density (PSD) drops from 193.622 to 107.910 m2·s−2·Hz−1, and turbulent kinetic energy (TKE) decreases from 0.170 to 0.115 m2/s2. PSD in the wake area is 76.93 % lower than in the corridor. Turbulence intensity (TI) is substantially higher than values typically observed in open and unobstructed areas. Except for the incoming air temperature, building surface temperature, which is influenced by solar radiation and surface thermal properties, is the main factor affecting air temperature within the building complex. Incoming wind speed has a relatively weak influence. Non-uniformity analysis shows that surface temperature variance is highest on the south side (1.88 °C2), followed by the ground (0.86 °C2), west (0.57 °C2), east (0.46 °C2), and north (0.19 °C2). A hierarchical strategy treats surfaces with higher temperature variance as non-uniform. This study not only reveals the impact of building morphology on the wind-thermal environment under the shading effect, but also provides valuable experimental data for further studies.
郑州市1:15尺度建筑群秋季遮阳对风热环境影响的实验研究
建筑综合体内的风热环境与气象参数、建筑综合体形态设计和建筑综合体表面温度密切相关。现有的研究大多忽略了建筑物之间的遮阳效应,导致建筑群与孤立建筑之间的表面温度和湍流特性存在显著差异。因此,本研究在中国郑州建造了一个4 × 4规模的建筑群(比例为1:15)。采用统计分析方法考察了气象因子和建筑形态对风热环境的影响。结果表明:气流沿通风走廊移动6.7 m后,功率谱密度(PSD)从193.622下降到107.910 m2·s−2·Hz−1,湍流动能(TKE)从0.170下降到0.115 m2/s2;尾流区的PSD比走廊区的低76.93%。湍流强度(TI)大大高于在开放和无阻塞区域通常观察到的值。除入风温度外,建筑表面温度是影响建筑群内空气温度的主要因素,受太阳辐射和表面热工性能的影响。来袭风速的影响相对较弱。非均匀性分析表明,南侧地表温度变化最大(1.88°C2),其次是地面(0.86°C2)、西部(0.57°C2)、东部(0.46°C2)和北部(0.19°C2)。分层策略将温度变化较大的表面视为不均匀的。本研究不仅揭示了遮阳作用下建筑形态对风热环境的影响,而且为进一步研究提供了有价值的实验数据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Urban Climate
Urban Climate Social Sciences-Urban Studies
CiteScore
9.70
自引率
9.40%
发文量
286
期刊介绍: Urban Climate serves the scientific and decision making communities with the publication of research on theory, science and applications relevant to understanding urban climatic conditions and change in relation to their geography and to demographic, socioeconomic, institutional, technological and environmental dynamics and global change. Targeted towards both disciplinary and interdisciplinary audiences, this journal publishes original research papers, comprehensive review articles, book reviews, and short communications on topics including, but not limited to, the following: Urban meteorology and climate[...] Urban environmental pollution[...] Adaptation to global change[...] Urban economic and social issues[...] Research Approaches[...]
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