室内环境参数对室外气象参数瞬时变化的动态响应研究

为研究空调房间室内环境参数对室外气象参数瞬时变化的动态响应,采用CFD中的标准k-ε模型对兰州地区某办公室在考虑非稳定传热情况下的室内气流组织和污染物浓度场进行数值分析,获得了顶送风/下回风和侧送风/下回风两种通风模式下室内流场、温度场及污染物浓度场的分布。结果表明:不同时刻的太阳辐射通过激励室内自然对流换热过程对室内污染物的空间分布及迁移特性产生了显著影响。同一送风模式下,16:00时室内的污染物浓度较8:00时均匀,而8:00时的污染物浓度平均水平较高;在同一送风参数下,采用顶送风方式时更有利于降低室内污染物浓度。

Dynamic response study of the indoor environmental parameters forvariable outdoor meteorological conditions

To study the indoor environment parameters dynamic response to the instantaneous variation of outdoor meteorological conditions in Lanzhou,a standard k-ε turbulent model of CFD is adopted to numerically analyze the pollutant concentration field and airflow distribution in an office when the unsteady heat transfer through outer walls is considered.The velocity field,temperature field and pollutant concentration field of two air supply modes,ceiling air supply and lateral air supply,are obtained.The results indicate that the pollutant concentration field and migration characteristics are affected significantly by the solar radiation resulting from stimulating the natural convention heat transfer in the room.Under the same air supply mode,the indoor pollutant concentration is more uniform at 16:00 than that at 8:00.And the average value of pollutant concentration at 8:00 is relatively higher than that at 16:00.At the same air supply parameters,the ceiling air supply mode is more beneficial to lower the indoor pollutant concentration.