地板辐射采暖系统温度分布测试及数值分析

Test and Numerical Analysis on Characteristics of Temperature Distribution Inside Building with Radiant Floor Heating

对某加装低温热水地板辐射采暖的系统分开门和闭门两种情况进行温度分布特性的实验测定,结果表明:地板辐射采暖房间内温度分布总体上是自下而上,从高到低变化,地板表面温度最高,但空间的温度变化幅度不大;而且处于人活动的空间范围中,温度竖向分布差别不大(最大差别为0.73℃),具有良好的热舒适性.此外,房间开门或闭门,空间内每一层的温度分布都比较均匀,开门处的气流对温度分布的均匀性基本没有影响,但受此气流影响,开门时各个测点的温度和闭门时相比普遍降低,但地板表面温度还维持原来水平.此外,还采用了4种不同的湍流模型,利用商用CFD软件Fluent进行地板辐射采暖空间的三维流动与换热的数值模拟,数值结果表明,标准k-ε模型能较好满足数值计算要求.

Experimental and numerical simulations were made on the characteristics of the temperature distribution inside building with radiant floor heating. Experiment analysis shows that one of the main features of radiant floor heating is the uniform temperature condition from floor to ceiling. The vertical air temperature difference measured in a test space is less than 0.73℃, and this is the reason why radiant floor heating can cause to a good thermal comfort. Experimental results show that the air temperature of the radiant floor heating room is uniform in despite of the door open or closed. Four turbulent mathematical models were validated by using the CFD software Fluent and the velocity fields and temperature fields were numerically computed by using a steady turbulent mathematical model for the radiant floor heating system. The results show that the radiant floor heating can cause to a good thermal comfort,and the standard x - e turbulent model can be the right simulation model for radiant floor heating.