Impact of building envelope design parameters on diurnal building anthropogenic heat emission
Impact of building envelope design parameters on diurnal building anthropogenic heat emission
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DOI：
10.1016/j.buildenv.2023.110134
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发表时间：
2023-02
影响因子：
7.4
通讯作者：
Yiqing Liu;Zhiwen Luo;S. Grimmond
中科院分区：
文献类型：
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作者：
Yiqing Liu;Zhiwen Luo;S. Grimmond
来自建筑物的人为热通量（QF，B）是城市中额外加热的主要来源，但在空间和时间上都是变化的。了解QF，B随时间的变化对通过适当的建筑设计调节城市气候至关重要。本文基于一种新的QF，B的确定方法[1]，通过北京地区的参数化建筑能量模型，研究了建筑围护结构设计参数对QF，B的大小和季节变化的影响。利用K-均值聚类分析，识别出各季节具有明显代表性的QF、Bin日变化模式。通过基于分类的分析，我们对建筑参数进行排名，以了解它们在导致这些不同QF，B模式中的作用。得出以下结论：（1）影响QF的主要建筑参数是裸U值和热质量。(2)U值在所有季节都有效地调节昼夜模式和日幅度。U值较小的建筑物（例如，U-0.2）具有较低的日能量消耗，导致冬季QF，Bdaily mean降低高达73%。(3)热质量在秋/春季QF，B更为重要，它既能使日峰值降低68%，又能使以机械冷却为主的日变化模式（峰值在15：00-17：00）转变为自然通风（峰值在01：00-06：00），滞后8-15 h。(4)结合自然通风，适当的建筑围护结构设计（例如，小U值与轻质织物），以实现建筑节能和改善室外热环境。我们的研究结果可以帮助确定有用的建筑设计策略，以减轻城市热或冷的时期，在城市的暖/冷。
Anthropogenic heat fluxes from buildings (QF,B) are a major source of additional heating in cities, but vary both spatially and temporally. Knowledge of temporal variations ofQF,Bis critical to modulate urban climate through appropriate building design. Based on a new method to determineQF,B[1], this study investigates the influences of building envelope design parameters on both magnitude and diurnal pattern ofQF,Bby season through parametric building energy modelling in Beijing. Using K-mean clustering, the distinctly representative diurnal patterns ofQF,Bin each season are identified. With classification-based analysis, we rank building parameters to understand their roles in causing these distinctQF,Bpatterns. We conclude that: (1) the most important building parameters influencingQF,Bare U-value and thermal mass. (2) U-values effectively modulate both diurnal pattern and daily magnitude in all seasons. Buildings with small U-value (e.g., U-0.2) have lower daily energy consumption, resulting in an up to 73% reduction inQF,Bdaily mean in winter. (3) Thermal mass is more important in autumn/springQF,B.It can both reduce the daily peak by up to 68% and shift the diurnal pattern dominated by mechanical cooling (peak during 15:00–17:00) into natural ventilation (peak during 01:00–06:00) with an 8–15 h lag. (4) Combined with natural ventilation, appropriate building envelope designs (e.g., small U-value with lightweight fabric) should be considered to achieve both building energy-saving and improving outdoor thermal environment. Our results could help identify useful building design strategies to mitigate urban warming/cold in the periods that are hot or cold in cities.