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A design supporting simulation system for predicting and evaluating the cool microclimate creating effect of passive evaporative cooling walls

机译：设计支持的仿真系统，用于预测和评估被动蒸发式冷却墙的凉爽微气候产生效果

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摘要

As a passive cooling strategy to control increased surface temperatures and create cooler urban environments, we have developed a passive evaporative cooling wall (PECW) constructed of pipe-shaped ceramics that possess a capillary force to absorb water up to a level higher than 130 cm. The current paper presents a simulation system to predict and evaluate microclimatic modifying effects of PECWs in urban locations where PECW installation is under consideration at the design stage. This simulation system is composed of a CFD simulation tool and a 3D-CAD-based thermal simulation tool. Simulation methodology of coupling the two simulation tools was developed and described in this paper. Numerical models for simulating surface temperatures and evaporation of PECWs were proposed based on analysis results of experimental data. Validation of the proposed numerical models was confirmed by comparing simulated results with measured data. In order to demonstrate the applicability of the proposed simulation system, a case study was then performed to predict and evaluate the microclimate in a rest station where PECWs were assumed to be installed. Spatial distributions of air temperature, airflow, moisture and surface temperature in the rest station were simulated under a sunny weather condition in the summer of Tokyo. Furthermore, thermal comfort indexes (mean radiant temperature and new standard effective temperature) were used to evaluate thermal comfort in the human activity spaces of the rest station. Simulation results show that this simulation system can provide quantitative predictions and evaluations of microclimatic modifying effects resulting from the application of PECWs.
机译：作为控制表面温度升高并创造更凉爽的城市环境的被动冷却策略，我们开发了一种被动蒸发冷却壁（PECW），它由管状陶瓷构成，该陶瓷具有毛细作用力，可吸收高达130厘米以上的水。当前的论文提出了一种模拟系统，用于预测和评估在设计阶段正在考虑安装PECW的城市地区PECW的微气候变化效果。该模拟系统由CFD模拟工具和基于3D-CAD的热模拟工具组成。本文开发并描述了将这两种仿真工具耦合在一起的仿真方法。基于实验数据的分析结果，提出了模拟PECWs表面温度和蒸发的数值模型。通过将模拟结果与实测数据进行比较，证实了所提出数值模型的有效性。为了证明所提出的仿真系统的适用性，然后进行了案例研究，以预测和评估假定安装了PECW的休息站的小气候。在东京夏季晴天的情况下，模拟了休息站的气温，气流，湿度和地表温度的空间分布。此外，使用热舒适指数（平均辐射温度和新的标准有效温度）来评估休息站的人类活动空间中的热舒适。仿真结果表明，该仿真系统可以为应用PECW产生的微气候改变效果提供定量预测和评估。

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