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Comparative life cycle assessment of standard and green roofs

机译：标准屋顶和绿色屋顶的比较生命周期评估

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Life cycle assessment (LCA) is used to evaluate the benefits, primarily from reduced energy consumption, resulting from the addition of a green roof to an eight story residential building in Madrid. Building energy use is simulated and a bottom-up LCA is conducted assuming a 50 year building life. The key property of a green roof is its low solar absorptance, which causes lower surface temperature, thereby reducing the heat flux through the roof. Savings in annual energy use are just over 1%, but summer cooling load is reduced by over 6% and reductions in peak hour cooling load in the upper floors reach 25%. By replacing the common flat roof with a green roof, environmental impacts are reduced by between 1.0 and 5.3%. Similar reductions might be achieved by using a white roof with additional insulation for winter, but more substantial reductions are achieved if common use of green roofs leads to reductions in the urban heat island.
机译：生命周期评估（LCA）用于评估收益，这些收益主要来自减少能耗，这是由于马德里的一幢八层住宅楼增加了绿色屋顶所致。模拟建筑能耗，并假设建筑寿命为50年，进行自下而上的LCA。绿色屋顶的关键特性是其较低的日光吸收率，这会导致较低的表面温度，从而降低通过屋顶的热通量。每年节省的能源使用量仅超过1％，但夏季的制冷负荷减少了6％以上，高层的高峰时段制冷负荷减少了25％。通过将普通的平屋顶替换为绿色屋顶，对环境的影响减少了1.0％至5.3％。可以通过在冬季使用带有额外隔热材料的白色屋顶来实现类似的减少，但是如果绿色屋顶的普遍使用导致城市热岛的减少，则可以实现更大幅度的减少。

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