Cool and green roofs. An energy and comfort comparison between passive cooling and mitigation urban heat island techniques for residential buildings in the Mediterranean region
Cool and green roofs. An energy and comfort comparison between passive cooling and mitigation urban heat island techniques for residential buildings in the Mediterranean region
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DOI：
10.1016/j.enbuild.2011.09.024
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发表时间：
2012-12
影响因子：
6.7
通讯作者：
M. Zinzi;S. Agnoli
中科院分区：
文献类型：
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作者：
M. Zinzi;S. Agnoli
在降温季节，高峰和能源需求的增加以及城市热岛效应的加剧正成为一个关键问题。这一趋势在几个纬度都有观察到，包括在建筑物和城市层面不知道过热的地区。这一现象涉及不同的问题：减少温室气体，室内和室外环境的质量和舒适度，能源供应安全，公共健康。建筑部门直接参与了这一变化，适当的解决方案可以在能源和环境方面带来巨大的好处。屋顶尤其是围护结构部件，先进的解决方案可以为冷却建筑物提供显着的节能效果，或改善非冷却建筑物的室内热条件。凉爽的材料通过将入射的太阳辐射从建筑物反射出去并在夜间将热量辐射出去，使屋顶在阳光下保持凉爽。覆盖着植被的屋顶利用土壤提供的额外隔热和蒸发蒸腾作用，使屋顶在阳光下保持凉爽。这两种技术的不同之处在于：结构要求，初始和终身维护成本，对建筑物整体能源性能的影响。本文提出了一种数值比较分析这些解决方案，考虑到几个参数，影响最终的能源性能。通过动态模拟，本文描述了如何凉爽和绿色屋顶可以改善居住建筑的能源性能在不同的地方在地中海纬度。
The increase of peak and energy demand during the cooling season is becoming a crucial issue, as well as the intensification of the urban heat island effect. This trend is observed at several latitudes, including areas where overheating was unknown at building and urban levels. This phenomenon involves different issues: reduction of greenhouse gases, quality and comfort in outdoor and indoor environment, security of energy supply, public health. The building sector is directly involved in this change and adequate solutions can provide great benefit at energy and environmental levels. Roofs in particular are envelope components for which advanced solutions can provide significant energy savings in cooled buildings or improve indoor thermal conditions in not cooled buildings. Cool materials keep the roof cool under the sun by reflecting the incident solar radiation away from the building and radiating the heat away at night. Roofs covered with vegetation take benefits of the additional thermal insulation provided by the soil and of the evapo-transpiration to keep the roof cool under the sun. These two technologies are different in: structural requirements, initial and lifetime maintenance costs, impact on the overall energy performance of buildings. This paper presents a numerical comparative analysis between these solutions, taking into account the several parameters that affect the final energy performances. By means of dynamic simulations, the paper depicts how cool and green roofs can improve the energy performance of residential buildings in different localities at Mediterranean latitudes.