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What's 'cool' in the world of green facades? How plant choice influences the cooling properties of green walls

机译：在绿色外墙世界中什么是“酷”？植物选择如何影响绿墙的冷却性能

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Green walls provide an option for reducing the thermal load on buildings, reducing the requirement for mechanised air conditioning and helping to mitigate urban heat islands. The range and extent of benefits can vary with green wall typology. This research investigated green facades utilising wall shrubs and climbing plants to reduce air temperature adjacent to, and surface temperatures of, brick walls. Artificial wall sections were used to provide replicated data sets in both outdoor and controlled environmental conditions. During periods of high solar irradiance outdoors, the presence of live Prunus laurocerasus plants placed against walls significantly reduced air and surface temperatures compared to blank walls, but also in comparison to excised (non-transpiring) plant sections. Largest temperature differentials were recorded mid-late afternoon, where air adjacent to vegetated walls was 3 ℃ cooler than non-vegetated walls. Prunus also provided significant wall cooling in controlled environment studies, but was intermediate in its surface cooling capacity (6.3 ℃) compared to other species; Stachys and Hedera providing ＞7.0 ℃ cooling. When evaluated on a per leaf area basis, however, other species demonstrated greater cooling potential with Fuchsia, Jasminum and Lonicera out-performing others. Not only was it evident that different species varied in their cooling capacity, but that the mechanisms for providing wall cooling varied between species. Fuchsia promoted evapo-transpiration cooling, whereas shade cooling was more important in Jasminum and Lonicera. Plant physiology and leaf area/morphology should be considered when selecting species to maximise cooling in green wall applications.
机译：绿墙为减少建筑物的热负荷，减少对机械空调的需求以及减轻城市热岛提供了一种选择。收益的范围和程度可能会因绿墙类型而异。这项研究调查了绿色外墙，利用墙壁灌木和攀援植物来降低邻近砖墙的空气温度以及砖墙的表面温度。人造墙部分用于在室外和受控环境条件下提供重复的数据集。在户外日照强度高的时期，与空白墙相比，与壁上相比，以及与被切除（非蒸腾）的植物部分相比，存在于墙壁上的活李子（Prunus laurocerasus）植物的存在显着降低了空气和表面温度。下午中后期记录到最大的温差，其中植物墙附近的空气比非植物墙的温度低3℃。李子在受控环境研究中还提供了显着的壁冷却，但与其他物种相比，其表面冷却能力（6.3℃）中等。 Stachys和Hedera提供＞ 7.0℃的冷却。但是，按每叶面积进行评估时，其他物种表现出更大的降温潜力，而倒挂金钟，茉莉和忍冬更胜于其他物种。不仅显而易见的是，不同物种的冷却能力也不同，而且不同物种之间提供壁冷的机制也不同。紫红色促进蒸发蒸腾冷却，而在茉莉和忍冬中，阴凉冷却更为重要。选择物种以在绿墙应用中最大程度地降温时，应考虑植物生理和叶面积/形态。

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