基于RC简化传热模型的混凝土辐射顶板传热及供冷能力研究

为研究混凝土冷辐射板的传热情况并对其供冷能力进行分析，采用RC简化传热模型建立混凝土辐射板二维稳态的传热模型，对混凝土辐射板内部传热情况进行模拟，计算得到混凝土内部及表面温度场.根据计算结果分析不同供水温度、埋管间距情况下，冷顶板表面的温度分布情况及供冷能力.经过实验验证，RC简化传热模型对板内温度和供冷能力的计算误差小于6%；混凝土冷辐射板供冷能力受供水水温、埋管间距及流量的直接影响，当供水温度为11~14 ℃，总流量为0.26~0.33 m3/h，室内空气温度为25~26 ℃时，混凝土辐射板平均供冷量为40~50 W/m2.
This paper aims to study the characteristics of heat transfer for concrete radiant ceiling and its cooling capacity. A two-dimensional stead-state heat transfer model on the basis of simplified RC (Resistance and Capacity) Method was adopted to simulate the inner heat-transfer condition of concrete ceiling as well as the temperature fields. The calculated results showed that the cooling capacity of concrete radiant ceiling was affected by the temperature of supply water, distance of tubes and water flow rate. When the supply water temperature, flow rate and indoor air temperature ranged from 11~14 ℃, 0.26 ~0.33 m3/h and 25~26 ℃, respectively, the cooling capacity varied from 40 to 50 W/m2. The simulation models were also validated by experimental results, and the calculation error was less than 6%.