热风供暖送风方式对高大空间室内污染物扩散的影响  

Effects of the Warm-Air Heating Supply Modes on Pollutant Diffusion in Large-Height Spaces

作　　者：叶筱[1] 亢燕铭[1] 左滨[1] 钟珂[1] 

机构地区：[1]东华大学环境科学与工程学院,上海201620

出　　处：《东华大学学报（自然科学版）》2015年第6期821-828,850,共9页Journal of Donghua University(Natural Science)

基　　金：国家自然科学基金资助项目(51278094);上海市教委科研创新重点资助项目(13ZZ054)

摘　　要：利用数值模拟方法研究分析了混合通风和碰撞射流通风供暖时,高大空间内的热环境及污染物浓度分布特征.结果表明,两种热风供暖方式在高大空间内形成的气流形态完全不同,导致污染物的空间分布也有很大差别.碰撞射流通风时,不同类型污染物(CO2和2.5μm颗粒物)在房间内都能均匀分布,而混合通风时,两者在房间内的分布极不均匀且表现出不同的分布特征,CO2集中分布于房间中部,2.5μm颗粒物则集中分布在远离外墙的近地面区.碰撞射流通风比混合通风更有利于污染物的排除.此外,送风温差对混合通风房间内污染物的分布特征有明显影响,但对碰撞射流通风基本没有影响.The indoor thermal environment and contaminant concentration distribution are studied numerically in large-height spaces under mixing ventilation （MV） and impinging jet ventilation （IJV）. The results show that the indoor air flow fields are different in the two ventilation strategies when they are used for room heating, and then results in a considerable difference in the spatial distribution of contaminants. The two types of pollutants （CO2 and particles with size of 2.5 μm） are seemed to be uniformly distributed in the IJV, while the concentration field in the MV is different, i.e., the CO2 is mainly distributed in the center of the room and the particles are distributed near the floor away from the external wall. The results also show that the IJV is more efficient for pollutant removal than the MV. In addition, the air supply temperature difference has a strong influence on the distribution characteristics of contaminations in the MV, and this effect can be neglected in the IJV.

关 键 词：高大空间 热风供暖 混合通风 碰撞射流通风 主动式污染物 被动式污染物 

分 类 号：TU831.3[建筑科学—供热、供燃气、通风及空调工程]