Considering each affected factor,the exterior emanation rate formula for the soil and building material were deduced,on the basis of which,the relation of indoor radon concentration and air change rate was deduced also.
应用以上公式,对一典型的地下空间模型进行了计算,结果表明:地下空间氡的主要来源是土壤氡气的逸出,约占总析氡量的70豫～90豫;在较高的氡浓度状态下,室内氡浓度对通风十分敏感,增大地下空间的通风换气率,会使空气氡浓度大幅度的降低。
It puts forward that inverted breaststroke and inverted crawl in synchronization may help beginners to master the way of change breath very conveniently.
本文通过对比实验,指出掌握水中换气方法是学习蛙泳技术及其他泳姿动作的关键,提出同步的反蛙泳和仰泳练习,可以使初学者快捷地学会蛙泳的换气动作。
For evaluating the degree to which the supply air can remove indoor contaminants,gives an introduction to the concepts of the age of air,air exchange efficiency,ventilation efficiency,etc.
就空调送风气流组织排除室内污染物能力的评价,介绍了北欧及英国学者采用拉格朗日法提出的空气龄、换气效率、排污效率等概念,详细推导了示踪气体浓度与局部平均空气龄的关系,阐述了换气效率与排污效率的关系。
The computation is done with Fluent soft and the evaluation index data that contains age of air, air exchange efficiency and recovery time etc are picked up and processed.
将实验与数值模拟相结合,根据实验数据修正数学模型,利用Fluent软件进行计算,重点对空气龄、换气效率、自净时间等评价指标进行了提取和处理,对两种气流组织方式的实验数据及计算结果进行了分析比较。
The k-ε turbulence model was applied for numerical simulation of indoor fluid flow and age of air,and the air exchange efficiency was obtained.
笔者以YW25G型空调硬卧列车车厢为研究对象,在物理模型中考虑了旅客以及车厢内各障碍物(包括边桌、行李架、床铺、折座)等对流场的影响,采用k-ε湍流模型及数值模拟的方法,对硬卧车厢内流场及空气龄的分布变化规律进行研究,从而得到车厢内的换气效率。