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Evaluation of the cooling effect provided by a green facade as nature-based system for buildings

机译：评估绿色立面作为基于自然的建筑系统的冷却效果

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A strategy to make cities greener involves the use of green infrastructures. In this context, green facades applied to vertical envelope of buildings are one of the most promising technologies. Their contribution is particularly significant as passive cooling systems for buildings. Green facades allow to decrease air and surfaces temperatures mainly by canopy evapotranspiration and shading. Such processes are strongly influenced by environmental conditions and canopy characteristics. Aim of this research was to model and evaluate evapotranspirative and shading effects. Data recorded on an experimental prototype of building equipped with green facade were used for model development and assessment. Canopy characteristics, as leaf area index in vertical greening, were defined. Evapotranspiration was both measured with a load cell and evaluated through the green layer energy balance. The goodness-of-fit of the models was assessed by statistical indices. The models using PenmanMonteith and Deardorff formula, in summer, recorded average values of root mean square error equal to 12.48 W m(-2) and to 14.61 W m(-2), respectively. Plant coefficients useful for the application in vertical greening of the standardized evapotranspiration reference equation were defined. These were equal to 1.3 and 2.0 for Rhyncospermum Jasminoides in summer and spring, respectively. The daily overall cooling effect in summer, due to evapotranspiration and shading, was equal, on average, to 16.2 MJ m(-2) of wall surface. Shading contributed about twice as much as the evapotranspiration. The findings of this research can be a useful contribution to writing routines of building energy models expressly developed for green facades.
机译：使城市更环保的战略涉及使用绿色基础设施。在这种情况下，应用于建筑物的垂直包膜的绿色外墙是最有前途的技术之一。它们的贡献特别显着作为建筑物的被动冷却系统。绿色环形允许通过冠层蒸散和遮光来减少空气和表面温度。这些过程受环境条件和冠层特征的强烈影响。本研究的目的是模拟和评估蒸发疏散和遮荫效果。记录在配备绿色外观的建筑的实验原型上的数据用于模型开发和评估。定义了垂直绿化中叶面积指数的冠层特征。蒸发蒸腾均用载荷电池测量，并通过绿色层能量平衡评估。通过统计指标评估模型的美好健康。夏季使用Penmanmonteith和Deardorff公式的模型，录制的均方根误差的平均值分别等于12.48W m（-2）和14.61 W m（-2）。定义了对标准化蒸发参考等式的垂直绿化中应用的植物系数。对于夏季和春季的rhyncospermum jasminoides，这些等于1.3和2.0。夏季的日常整体冷却效果，由于蒸散和遮光，平均相等，平均为16.2MJ m（-2）壁面。阴影约为蒸散量的两倍。该研究的结果对于为绿色外墙明确开发的建筑能源模型进行惯例，这可能是一个有用的贡献。

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