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Numerical Analysis of Passive Microclimatic-Modifying Effects of a Moist Void-Brick Wall

As a passive cooling strategy aimed at controlling increased surface temperatures and creating cooler urban environments, a passive evaporative cooling wall constructed of moist void bricks was developed. The wall is capable of absorbing water and allows wind penetration, thus reducing their surface temperatures by means of water evaporation. This paper presents a numerical simulation method to predict and evaluate microclimatic modifying effects (air temperature reduction, ventilation cooling and vapor generation) of the wall in urban locations where installation of the wall is under consideration. This simulation is performed by coupling computational fluid dynamics (CFD) with a 3D-CAD-based thermal simulation tool. Methodology of the coupled simulation was described in this paper. In order to demonstrate the applicability of the proposed simulation method, a case study was performed to predict and evaluate the thermal improvement effect of the wall on thermal comfort at a rest station where the wall was installed. Simulation results show that, in terms of air temperature, airflow, humidity and surface temperature distributions, this simulation method can provide quantitative predictions and evaluations of microclimatic modifying effects resulting from the application of the wall.