Can Areawide Building Retrofitting Affect the Urban Microclimate? An LES Study for Berlin, Germany
Can Areawide Building Retrofitting Affect the Urban Microclimate? An LES Study for Berlin, Germany
复制标题
大范围的建筑改造能否影响城市小气候？
DOI：
10.1175/jamc-d-21-0216.1
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发表时间：
2022
影响因子：
3
通讯作者：
Li, Dan
中科院分区：
文献类型：
--
作者：
Maronga, Björn;Winkler, Matthias;Li, Dan
在这项工作中，我们调查了区域范围内的建筑改造对德国柏林城区夏季街道室外温度的影响。我们进行了两个建筑解决，为期一周的大涡模拟：一个与非改造的建筑物，另一个与改造的建筑物在整个域，以满足今天的能源效率标准。两个模拟的比较表明，在白天条件下，平均室外温度较高的改造建筑物。这种行为是由改装情况下最外层屋顶/墙壁层的小得多的惯性引起的，其通过隔热层与内部屋顶/墙壁层热解耦。因此，最外层在白天加热得更厉害，导致进入大气的显热通量增加。在夜间，最外层的温度下降得更快，导致大气冷却。然而，随着模拟的进行，冷却效果变小，变暖效果变大。一周后，我们发现白天的平均温度升高了4 K，而冷却效果变得可以忽略不计。重要性声明欧洲和其他大陆正在进行建筑改造，作为减少能源消耗的措施。建筑围护结构的变化直接影响着城市的氛围。我们的研究表明，在德国城市地区的区域范围内的改造可能会对夏季的室外微气候产生负面影响，导致更高的空气温度。
In this work, we investigate the effect of areawide building retrofitting on summertime, street-level outdoor temperatures in an urban district in Berlin, Germany. We perform two building-resolving, weeklong large-eddy simulations: one with nonretrofitted buildings and the other with retrofitted buildings in the entire domain to meet today’s energy efficiency standards. The comparison of the two simulations reveals that the mean outdoor temperatures are higher with retrofitted buildings during daytime conditions. This behavior is caused by the much smaller inertia of the outermost roof/wall layer in the retrofitting case, which is thermally decoupled from the inner roof/wall layers by an insulation layer. As a result, the outermost layer heats up more rigorously during the daytime, leading to increased sensible heat fluxes into the atmosphere. During the nighttime, the outermost layer’s temperature drops down faster, resulting in cooling of the atmosphere. However, as the simulation progresses, the cooling effect becomes smaller and the warming effect becomes larger. After 1 week, we find the mean temperatures to be 4 K higher during the daytime while the cooling effects become negligible.Significance StatementBuilding retrofitting is taking place in Europe and other continents as a measure to reduce energy consumption. The change in the building envelope directly influences the urban atmosphere. Our study reveals that areawide retrofitting in a German city district can have negative effects on the outdoor microclimate in summer by causing higher air temperatures.