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  

Numerical Analysis on the Effect of the Envelope Coupled Heat Transfer on C_7H_8 Emission in a Floor Heating Room

作　　者：王烨[1,2] 孙鹏宝 付银安 管国祥[1] 王靖文[1] 

机构地区：[1]兰州交通大学环境与市政工程学院,兰州730070 [2]兰州交通大学铁道车辆热工教育部重点实验室,兰州730070

出　　处：《北京工业大学学报》2016年第12期1907-1915,共9页Journal of Beijing University of Technology

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)

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.To obtain the initial condition of pollutants profile for natural ventilation numerical simulation in winter,the Realizable k-ε turbulence model was adopted to numerically analyze the C7H8 concentration field in a civil residence in Lanzhou. The results indicate that the indoor C7H8 concentration which comes from the floor and emits in outer normal direction is affected significantly by the coupled heat transfer between the indoor and the outdoor environment. T he average value of C7H8 concentration in the horizontal section of Z = 1. 10 m is three times of the limited value of the indoor air quality standard while the average indoor temperature and the thermal comfort can satisfy the resident’s need when the temperature of floor surface is kept at 27 ℃ and the emitting time is up to 19 hours. Considering the climate condition and the residents’ living habits in Lanzhou,the pollutant emitting time, 19 hours,is thought to be reasonable to decide the initial condition of pollutant concentration in natural ventilation simulation.

关 键 词：室内空气品质 地板供暖 耦合传热 污染物散发 

分 类 号：TU832[建筑科学—供热、供燃气、通风及空调工程]