置换通风室内热舒适性影响研究

Study on Influence Factors of Thermal Comfort in Rooms with Displacement Ventilation

利用商业软件FLUENT,对置换通风室内热环境进行了数值模拟,根据计算出的流场、温度场,计算了PMV,采用正交实验方法考察了各因素的影响结果;根据PMV分布分析了送风口类型、送风速度和温度等因素对室内热舒适性的影响,并对实验设计的水平组合进行优化。结果表明:正交实验中,送风主要影响送风口附近区域的PMV,各工况PMV总体变化趋势趋于一致;送风速度是影响室内热舒适性最为显著的因素;送风速度为0.25m/s或送风温度为18℃的几种工况下所得到的室内热环境相对较好。

The indoor thermal environment of the displacement ventilation has been numerically simulated by using the software FLUNET,the PMV was computed according to the velocity and temperature field, and parametric studies were conducted by orthogonal experiment. According to the distribution of PMV, the factors which influence the indoor thermal comfort were analyzed such as the style of supply-air outlet, the velocity and temperature of supply-air. The best combination of levels parameters is made in conclusion. The results show that supply-air mainly influences on the PMV near the outlet,the population variation of PMV in several cases are tend to be uniform;The most significant factor was the velocity of supply-air which influence the indoor PMV;The indoor thermal environment is relatively better in the cases which the velocity of supply-air is 0.25m/s or the temperature is 18℃.