摘要
在考虑人的呼吸量及呼吸成分的前提下,采用RNG k-ε湍流模型对低气压室内环境的传热传质进行数值模拟。对不同大气压下房间内的温度场、流场、氧气及二氧化碳气体的分布规律进行讨论,并对人体对流换热系数与经验值进行比较。研究结果表明:当大气压降低时,空气流速变化很小,房间的对流换热减弱,在稳定状态下温度略有上升;CO2体积分数增大,O2质量分数下降;但增加房间送风速度可以更好地排除CO2,有利于改善室内空气品质;混合对流时人体表面的对流换热能力减弱,减弱的趋势比强迫对流换热的小。
Considering human＇s respiration capacity and component, the RNG k-e turbulent model was developed to study the heat and mass transfer of indoor air in the hypobaric atmosphere. Distribution feature of temperature, velocity, O2 concentration and CO2 concentration was discussed. Body convective heat transfer coefficients were compared with those obtained by empirical formula. The results show that with the decrease of pressure, the convection heat transfer tends to be weak, causing the temperature to slightly increase, while CO2 concentration increases with the decrease of O2 concentration. But raising the supplied air-flow speed helps to exclude CO2 and hence indoor air quality. Body convective heat transfer under mix convection has gentler trend than that under forced heat convection.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第1期388-396,共9页
Journal of Central South University:Science and Technology
基金
广东省省部产学研结合引导项目(2011B090400338)
