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Thermal comfort improvement in urban spaces with water spray systems: Field measurements and survey

机译：喷水系统改善城市空间的热舒适性：实地测量和调查

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摘要

An experimental study was conducted to improve the comfort and liveability of urban open spaces during the hottest months of the summer by implementing an overhead water mist cooling system. The campaign was conducted in two different Italian urbanscapes (Ancona and Rome, representative of Cfa and Csa climates) one after the other.Monitoring data and comfort questionnaires were combined to extract useful information by means of statistical tests, regressions and data mining algorithms and, ultimately, to delineate design and operating guidelines to maximize people's satisfaction with the misted environment.The cloud of droplets reduced the temperature and the UTCI by 8.2 degrees C and 7.9 degrees C respectively, against a 7% mean humidity premium. The vertical cooling and humidification profiles obeyed a Lorentzian distribution, peaking within approximately 0.5 m of the injection. The severe overheating experienced outside of the cooled areas evanished under the spray, with 67% (Ancona) to 90.6% (Rome) of respondents reporting only slight bending from thermal neutrality. Perception and preferences towards solar radiation, humidity level and wind all improved within the droplets mist.In terms of comfort-oriented, optimized design criteria, the system proved to work best with a dominant and steady light breeze (1-2 m/s), in highly irradiated sites and suspended at 1.2-1.5 m above the average height of users.
机译：通过实施顶置水雾冷却系统，进行了一项实验研究，以在夏季最热的月份中改善城市开放空间的舒适性和宜居性。这项运动是在两个不同的意大利城市景观中进行的（安科纳和罗马是Cfa和Csa气候的代表），监测数据和舒适度问卷通过统计检验，回归分析和数据挖掘算法相结合，以提取有用的信息，并且最终，要勾勒出设计和操作准则，以最大程度地提高人们对薄雾笼罩的环境的满意度。液滴云将温度和UTCI分别降低了8.2摄氏度和7.9摄氏度，而平均湿度却增加了7％。垂直的冷却和加湿曲线服从洛伦兹分布，在注入后约0.5 m内达到峰值。在喷雾下消失的冷却区域之外，出现了严重的过热现象，其中67％（安科纳（Ancona））至90.6％（罗马（Rome））的受访者表示，由于热中性而仅有轻微弯曲。在雾状雾中，太阳辐射，湿度和风的感知和偏爱都得到了改善。在舒适性导向，优化的设计标准方面，该系统被证明在显着且稳定的微风（1-2 m / s）下效果最佳，位于高辐射场所，并悬挂在使用者平均身高1.2-1.5 m处。

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