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The outdoor microclimate benefits and energy saving resulting from green roofs retrofits

机译：屋顶绿化改造带来的室外小气候效益和节能效果

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This paper focuses on the benefits on the local microclimate and the building energy saving resulting from green roof retrofits. The research investigates a case study located in a university campus in Toronto, Canada. After completing a detailed energy audit of the building, an assessment of the benefits resulting from the installation of an extensive green roof was performed. A virtual model validated using multiyear data of a local network of different weather stations was used to simulate the effects of the green roof retrofit over the outdoor microclimate. Then, a building energy model was used to compare the energy saving of several green roof designs. Results indicate that increasing the leaf area index (LAI) would lead to an increased cooling effect of the air temperature up to 0.4 degrees C during the day at pedestrian level, while a more significant temperature reduction would be obtained only at the rooftop level. This confirms the potential of green roofs as urban heat island mitigation strategy. The adoption of a green roof retrofit resulted in a building energy demand reduction by 3%, and in significantly improved indoor comfort levels in the floor below the green roof. Finally, the parametric analysis of different green roof options showed that for building energy savings, increasing the soil depth is more important than increasing the LAI. (C) 2016 Elsevier B.V. All rights reserved.
机译：本文重点介绍了绿色屋顶改造对当地小气候和建筑节能的好处。这项研究调查了一个位于加拿大多伦多大学校园内的案例研究。在完成对建筑物的详细能源审核之后，对安装大型绿化屋顶所产生的收益进行了评估。使用一个由不同气象站的本地网络的多年数据验证的虚拟模型来模拟室外小气候下屋顶绿化改造的效果。然后，使用建筑节能模型比较了几种绿色屋顶设计的节能效果。结果表明，增加叶面积指数（LAI）会导致白天行人水平的空气温度降温效果提高到0.4摄氏度，而只有在屋顶水平时，温度才能显着降低。这证实了绿色屋顶作为城市热岛缓解策略的潜力。采用绿色屋顶改造可将建筑能耗降低3％，并显着提高绿色屋顶下方地板的室内舒适度。最后，对不同绿色屋顶选项的参数分析表明，对于建筑节能而言，增加土壤深度比增加LAI更重要。 （C）2016 Elsevier B.V.保留所有权利。

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