Among water-based mitigation strategies against urban overheating, dry mist systems are especially promising, given their local impact, cost-effectiveness and controllability. Intense cooling capacity has been reported under a variety of climates, however, there is a growing need to define specific design guidelines towards an informed and optimized use of the technology. Parametric analysis on validated models would assist in determining type and degree of correlation between key parameters, as well as magnitude and predictability of the cooling capacity. In this paper, for the first time, a 3D microclimatic model in ENVI-met is used to simulate a misting system installed in Rome, Italy, with high prediction accuracy for the air temperature (R²≃0.87, RMSE≃0.84 °C). The calibrated ENVI-met model is used then to perform parameterizations on the water mist system, focused on the role of three key design variables: i) water flow rate, ii) injection height and iii) local wind speed. Results show that the most significant thermal drops tend to occur close but out of the misted perimeter following the wind direction, with cooling effects further stretched for tens of meters. The cooling capacity increases with the total water flow rate (+0.2 °C per 10 l/h increment) and in presence of calm air (+35-40 % per 0.8 m/s deceleration). Lower injections intensify the cooling a pedestrian height, which could be especially beneficial under windy conditions. Further research would target climate dependencies to extend the applicability of the above results and build up cohesive guidelines at the hands of urban planners and practitioners.

在针对城市过热的水基缓解策略中，考虑到其局部影响，成本效益和可控性，干雾系统特别有前途。据报道，在各种气候条件下都有强大的制冷能力，但是，越来越需要定义具体的设计准则，以实现对技术的知情和优化使用。对经过验证的模型进行参数分析将有助于确定关键参数之间的关联类型和相关程度，以及冷却能力的大小和可预测性。本文首次使用ENVI-met中的3D微气候模型来模拟安装在意大利罗马的雾化系统，该系统对空气温度具有很高的预测精度（R ²≃0.87，RMSE≃0.84°C）。然后，使用经过校准的ENVI-met模型对水雾系统进行参数化，重点是三个关键设计变量的作用：i）水流量，ii）喷射高度和iii）局部风速。结果表明，最显着的热降趋向于靠近风向，但在雾蒙蒙的外围沿风向发生，冷却效果进一步延伸数十米。冷却能力随着总水流量（每10 l / h增量+0.2°C）和存在稳定空气（每0.8 m / s减速+ 35-40％）而增加。较低的喷射量会加强行人高度的冷却，这在大风条件下尤其有利。