围护结构耦合传热条件下地板供暖室内甲苯扩散的数值分析

发布时间：2018-01-12 09:08

本文关键词：围护结构耦合传热条件下地板供暖室内甲苯扩散的数值分析　出处：《北京工业大学学报》2016年12期 　论文类型：期刊论文

【摘要】：为获得冬季自然通风数值模拟所需室内污染物分布的初始条件,采用Realizable k-ε湍流模型对兰州地区某地板供暖住宅内C_7H_8扩散过程进行了数值分析.结果表明:地板所含C_7H_8沿地板外法线方向扩散过程受室内外耦合传热影响,其时空分布存在显著差异.当地板表面维持27℃、扩散时长达到19 h时,C_7H_8在Z=1.10 m高度水平面上的浓度平均值趋于平缓,达到了室内空气质量标准要求上限值的3倍左右,但室内空气平均温度和舒适性能满足居住者的需求.因此,结合兰州地区气候条件和人们的生活起居习惯,确定以污染物扩散时长19 h的室内污染物浓度场和室内热环境条件作为后续自然通风数值分析的初始条件是合理的.
[Abstract]:In order to obtain the numerical simulation of natural ventilation in winter for the initial conditions of indoor pollutant distribution, using Realizable k- turbulence model for numerical analysis on diffusion of a C_7H_8 floor heating residential buildings in Lanzhou area in the process. The results showed that the C_7H_8 contained in the floor along the floor outside the normal direction of the diffusion process is affected by the inside and outside of the room coupled heat transfer, there are significant differences in the time distribution. When the floor surface to maintain 27 degrees, diffusion up to 19 h, the concentration of C_7H_8 in Z=1.10 m on the level of average height tends to be gentle to the indoor air quality standards 3 times the upper limit value, but the average air temperature and indoor comfort performance meet the needs of the occupants. Therefore, combined with Lanzhou the climate conditions and people's living habits, in order to determine the pollutant diffusion length of 19 h indoor pollutant concentration field and indoor thermal environment conditions for subsequent natural ventilation The initial conditions for the numerical analysis of the wind are reasonable.

【作者单位】：兰州交通大学环境与市政工程学院;兰州交通大学铁道车辆热工教育部重点实验室;
【基金】：国家自然科学基金资助项目(51266004,51476073) 甘肃省建设科技攻关项目(JK2016-2)
【分类号】：X51;TU832
【正文快照】： 2.兰州交通大学铁道车辆热工教育部重点实验室,兰州730070)长时间关闭窗户必然会导致由人体、地板、墙壁、家具等散发的污染物在室内聚集,使得室内空气质量严重恶化.在改善室内空气品质方面,自然通风因具有洁净、节能等优点而引起了人们的关注,并取得了大量的研究成果[1-11].

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