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首页> 外文期刊>Building and Environment >Effects of plant and substrate selection on thermal performance of green roofs during the summer
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Effects of plant and substrate selection on thermal performance of green roofs during the summer

机译：植物和基质选择对夏季绿色屋顶热性能的影响

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摘要

Green roof assemblies influence the total roof surface energy balance for a building. The energy balance for a green roof depends mostly on the selection of plants and substrates suitable for the building's location. This study measured thermal properties of common green roof materials and selected two types of plants and substrates to simulate transient thermal performance of different green roof assemblies. The selected plants and substrates have the highest and lowest reflectivity values to establish upper and lower bounds of thermal performance. The simulations use a previously developed green roof model including weather data for four cities representing different climate zones in the U.S. Based on the simulations, substrate heat fluxes and net radiation fluxes are compared for five days in July of the typical meteorological year. The results show that green roof assemblies receive net radiation fluxes that differ by 20％, and peak net radiation fluxes that differ by 16％, due to their different spectral reflectivity values. However, the substrate heat fluxes are similar for different green roof assemblies, as a roof insulation layer diminished this flux. Overall, the material selection of green roof assemblies is more important for buildings located in climate zone 4 or 5 than buildings located in climate zone 2 or 3, where limited water availability for evapotranspiration during hot, dry summers results in little thermal performance variability. Independent of the climate zones, simulation results show that the plant type has an important effect on the net radiation.
机译：绿化屋顶组件会影响建筑物的总屋顶表面能量平衡。绿色屋顶的能量平衡主要取决于适合建筑物所在位置的植物和底材的选择。这项研究测量了常见的绿色屋顶材料的热性能，并选择了两种类型的植物和基材来模拟不同绿色屋顶组件的瞬态热性能。选定的植物和基材具有最高和最低的反射率值，以建立热性能的上限和下限。模拟使用先前开发的绿色屋顶模型，该模型包括代表美国不同气候区的四个城市的天气数据。基于模拟，在典型气象年的7月比较了五天的底物热通量和净辐射通量。结果表明，由于它们的光谱反射率值不同，绿色屋顶组件的净辐射通量相差20％，峰值净辐射通量相差16％。然而，由于屋顶隔热层减少了这种热通量，因此对于不同的绿色屋顶组件，基板的热通量相​​似。总体而言，对于位于气候区4或5的建筑物而言，绿色屋顶组件的材料选择比位于气候区2或3的建筑物更为重要，在炎热干燥的夏季，用于蒸发蒸腾的可用水有限，导致热性能变化很小。模拟结果显示，不受气候区影响，植物类型对净辐射有重要影响。

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