Impact of reflective materials on urban canyon albedo, outdoor and indoor microclimates
Impact of reflective materials on urban canyon albedo, outdoor and indoor microclimates
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DOI：
10.1016/j.buildenv.2021.108459
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发表时间：
2021-10
影响因子：
7.4
通讯作者：
Agnese Salvati;M. Kolokotroni;Alkis Kotopouleas;R. Watkins;R. Giridharan;M. Nikolopoulou
中科院分区：
文献类型：
--
作者：
Agnese Salvati;M. Kolokotroni;Alkis Kotopouleas;R. Watkins;R. Giridharan;M. Nikolopoulou
城市峡谷的数量化能力的街道峡谷反射太阳辐射回天空。UCA由道路和立面的太阳反射率以及街道几何形状控制。本研究探讨了伦敦典型住宅区UCA的变化及其对室内外小气候的影响。结果是基于辐射测量在真实的城市峡谷和1：10的物理模型和模拟，使用Rummetv 4.4.6和EnergyPlus。不同的情况下，增加道路和立面的太阳反射率进行了模拟，以调查对UCA和街道水平微气候的影响。结果表明，增加道路反射率对宽峡谷UCA有较大的绝对和相对影响。在更深的峡谷中，道路反射率的绝对影响降低，而墙壁反射率的相对影响增加。结果还表明，增加城市峡谷的表面反射率对室外热舒适性产生不利影响，因为表面之间的相互反射增加，导致平均辐射温度升高。增加道路反射率也增加了对邻近建筑物的入射漫射辐射，产生室内工作温度的小幅增加。研究结果被用来讨论最佳的设计策略，以改善城市热环境，在城市峡谷中使用反射材料，而不影响室外热舒适性或室内热环境。
The urban canyon albedo (UCA) quantifies the ability of street canyons to reflect solar radiation back to the sky. The UCA is controlled by the solar reflectance of road and façades and the street geometry. This study investigates the variability of UCA in a typical residential area of London and its impact on outdoor and indoor microclimates. The results are based on radiation measurements in real urban canyons and on a 1:10 physical model and simulations using ENVImet v 4.4.6 and EnergyPlus. Different scenarios with increased solar reflectance of roads and façades were simulated to investigate the impact on UCA and street level microclimate. The results showed that increasing the road reflectance has high absolute and relative impact on UCA in wide canyons. In deeper canyons, the absolute impact of the road reflectance is reduced while the relative impact of the walls' reflectance is increased. Results also showed that increasing surface reflectance in urban canyons has a detrimental impact on outdoor thermal comfort, due to increased interreflections between surfaces leading to higher mean radiant temperatures. Increasing the road reflectance also increases the incident diffuse radiation on adjacent buildings, producing a small increase in indoor operative temperatures. The findings were used to discuss the best design strategies to improve the urban thermal environment by using reflective materials in urban canyons without compromising outdoor thermal comfort or indoor thermal environments.