Study on the Influence of Porosity on the Effectiveness of Diffuse Ceiling Ventilation Using Porous Panel
Diffuse ceiling ventilation system consists of three parts:upper plenum chamber,porous ceiling panel and lower room.The supply air enters into the lower room through the porous ceiling panel,so the opening size of the porous panel is closely related to the diffuse air supply process.However,there is currently a lack of research on the influence of porosity on the effectiveness of diffuse ceiling ventilation.This paper adopts the CFD numerical simulation method to establish a numerical calculation model for an office room using diffuse ceiling ventilation system,and analyzes the convective and radiant heat transfer of the ceiling panel,indoor thermal environment,thermal comfort and air age under different porosities.Results show that as the porosity increases from 5%to 20%,the indoor vertical temperature gradient increases.The convective and radiative heat transfer between the porous ceiling panel and the lower room decreases,with the proportion of convective heat transfer decreasing from 6%to-3.2%and the proportion of radiative heat transfer decreasing from 32%to 17%.Both personnel thermal comfort and average air age deteriorate,with PMV values changing from±0.5 to±0.8 and air age changing from 467 seconds to 541.4 seconds.
diffuse ceiling ventilationradiant heat transferthermal environmentthermal comfortair age
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