孔隙率对多孔板弥散送风效果的影响研究  

Study on the Influence of Porosity on the Effectiveness of Diffuse Ceiling Ventilation Using Porous Panel

作　　者：朱淮东 江世杰 Zhu Huaidong;Jiang Shijie(China Railway Shanghai Design Institute Group Corporation Limited,Shanghai,200070;School of Mechanical Engineering,Southwest Jiaotong University,Chengdu,610031)

机构地区：[1]中铁上海设计院集团有限公司,上海200070 [2]西南交通大学机械工程学院,成都610031

出　　处：《制冷与空调（四川）》2024年第2期189-195,共7页Refrigeration and Air Conditioning

摘　　要：弥散送风系统(DCV)由上部静压室、多孔吊顶板、下部房间三部分组成,送风气流通过多孔吊顶板进入下部房间,吊顶板的孔隙大小与弥散送风过程密切相关,目前缺乏吊顶板孔隙率对弥散送风效果的影响研究。采用CFD数值模拟方法,建立了某采用弥散送风系统的办公室的数值计算模型,分析了不同孔隙率下吊顶板对流和辐射传热、室内热环境、热舒适性和空气龄。结果表明:孔隙率由5%增加至20%时,室内垂直温度梯度随之增加;孔板与下部房间的对流和辐射换热量随孔隙率增加而降低,对流换热量占比由6%降低至-3.2%,辐射换热量占比由32%降至17%;人员的热舒适性和平均空气龄随孔隙率增加而变差,PMV值由±0.5变化至±0.8,空气龄由467s变化至541.4s。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.

关 键 词：弥散送风 辐射换热 热环境 热舒适 空气龄 

分 类 号：TU831.3[建筑科学—供热、供燃气、通风及空调工程]