通风方式对辐射空调房间室内空气分布特性的影响  

Influence of Ventilation Type on Indoor Air Distribution Characteristics in a Room with Ceiling Cooling

作　　者：吕品 吴小舟 于狄奇 高洁 王树刚[1] LYU Pin;WU Xiaozhou;YU Diqi;GAO Jie;WANG Shugang(School of Civil Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China;College of Civil Engineering and Architecture,Dalian University,Dalian 116622,Liaoning,China)

机构地区：[1]大连理工大学土木工程学院,辽宁大连116024 [2]大连大学建筑工程学院,辽宁大连116622

出　　处：《建筑科学》2020年第8期28-36,共9页Building Science

基　　金：国家自然科学基金资助项目(51408482&51808091);中央高校基本科研业务费(DUT20RC(5)015)。

摘　　要：本文在人工环境室中设置电热膜模拟外围护结构传热,通过实验的方法研究通风方式对辐射空调房间室内空气分布特性的影响。结果表明:当顶板表面温度及送风量变化范围为17~19℃及2.5~4.5 h-1时,地板送风室内垂直空气温差、紊流强度及除污效率变化范围较大,分别为0.2~0.5℃、47%~61%及0.64~0.82,而混合通风室内垂直空气温差、紊流强度及除污效率变化范围较小。此外,当顶板表面温度及送风量不超过18℃及3.5 h-1时,地板送风与混合通风室内空气温度分布差异比较明显,而空气速度及污染物浓度分布差异较小;而当顶板表面温度及送风量等于19℃及4.5 h-1时,地板送风与混合通风室内空气温度分布差异变得不明显,而空气速度及污染物浓度分布差异仍较小。因此,通风方式对辐射空调房间室内空气温度分布特性影响较大,而对空气速度及污染物浓度分布影响较小。Electric heating film was set up in a climate chamber to simulate the heat transfer of external building envelope.The influence of ventilation type on indoor air distribution characteristics was investigated by experiments.The results show that the vertical temperature difference of air,turbulence intensity and decontamination efficiency in the room with under-floor air distribution system changed greatly when the surface temperature and air output of ceiling were between 17~19℃and between 2.5~4.5 h-1.Specifically,the variation range of the three factors was from 0.2℃to 0.5℃,from 47%to 61%and from 0.64 to 0.82,respectively.However,the three factors in the room with mixing ventilation system only changed slightly.In addition,when the surface temperature and air output of ceiling was less than 18℃and 3.5 h-1,the room with under-floor air distribution system and the room with mixing ventilation system presented a large difference in indoor air temperature distribution.However,when the surface temperature and air output of ceiling was 19℃and 4.5 h-1,the two systems did not have a significant difference in indoor air temperature distribution.Despite the change of surface temperature and air output of ceiling,the two systems also did not show a significant difference in indoor air velocity and contaminant concentration distribution.It can be concluded that ventilation type has a great impact on indoor air temperature distribution in the room with radiant air conditioning system,but has little effect on air velocity and contaminant concentration distribution.

关 键 词：顶板辐射供冷 混合通风 地板送风 空气分布 

分 类 号：TU831.6[建筑科学—供热、供燃气、通风及空调工程]