寒冷地区住宅地板表面温度对地板供暖房间内环境参数的影响

Influence of surface temperature of residential building floor in cold region on the indoor environmental parameters of a floor heating room

为研究室外环境参数与地板表面温度同时变化对地板供暖房间内环境参数的影响规律,本文采用湍流Realizable k-ε模型模拟计算了4个地板温度下的室内温度场和C_7H_8浓度场。结果表明:地板表面温度小范围变化时,室内温度平均水平随时间表现出了相似的变化规律,地板表面温度为24℃时,能满足供暖温度需求,但不能满足舒适性要求;地板表面温度从25℃变化到27℃,Z=1.1 m水平面上的污染物浓度平均值在扩散时段的最大相对偏差仅为1.25%,但不同房间内温度场及污染物浓度场的局部分布特征则存在较大差异。地板表面温度大于等于25℃时,室内PMV值均大于等于-0.75,满足舒适性要求。

To study the influences of the simultaneous change of outdoor environmental parameters and the floor surface temperature on the indoor environmental parameters,the turbulent＂realizable＂k-ε model was adopted to carry out a simulative calculation for the indoor temperature field and C_7H_8 concentration field at four floor temperature values. The results indicate that the floor surface temperature affects the indoor average temperature in a similar way. A floor surface temperature of 24℃ can meet the indoor heating need but cannot meet the need of thermal comfort. When the surface temperature of floor changes from 25℃ to 27℃,the maximum relative deviation value of the average concentration of contaminant at Z = 1. 1 m level is 1. 25% during the period of contaminant diffusion.However,the local distribution characteristics of the temperature field and contaminant concentration field inside different rooms are greatly different. When the floor surface temperature is greater than or equal to 25℃,the indoor PMV value is not less than-0. 75,which satisfies the comfort requirement.