含空气层冷辐射板的改进及供冷和抗结露性能分析

Analysis on Cooling Capacity and Anti-condensation Ability of Improved Chilled Radiant Panel Containing Thinner Air Layer

为了提升含空气层冷辐射板的性能,本文建立一种新型含空气层冷辐射板的数学传热模型,由模型计算得到的辐射板供冷能力和表面平均温度与实验结果的误差分别为9.20%和-4.00%,证明该传热模型的可靠性较高。对辐射板冷冻水铜管与导热板的接触形式进行两种改造,利用已验证的传热模型对改进后的冷辐射板进行分析计算。计算结果表明:在最优参数条件下,空气层厚度减小为1 mm时两种辐射板的供冷能力分别提高了36.92 W/m2和33.19 W/m2;冷冻水平均温度每降低1℃、室内温度每升高1℃辐射板供冷能力分别平均提高7.46 W/m2和7.54 W/m2;辐射板表面最大温差几乎不变,抗结露能力良好。可见,改进后含空气薄层的冷辐射板供冷和抗结露性能良好,适合推广使用。

In order to improve the performance of chilled radiant panel （CRP） containing air layer, we firstly established a mathematical heat conduction model of CRP with air layer and evaluated its reliability. The deviation of model and experimental results about CRP cooling capacity and surface temperature was 9.20% and - 4.00% , which indicated that the model had high reliability. Then we change the contact form of CRP＇s chilled water brass and thermal plate by two ways and used the verified model to analyze the performance of the transformed CRPs. The results showed that two CRPs＇ cooling capacity increased 36.92 W/m2 and 33.19 W/m2 when the air layer thickness was reduced to 1 mm under the optimal parameters ; the cooling capacity averagely increased 7.46 W/m2 and 7, 54 W/m： as chilled water temperature decreased per 1 ℃ and indoor temperature increased per 1 ℃ ; the CRP＇s surface maximum temperature difference was constant. In conclusion, CRP containing thin layer has better performance on the cooling and anti-condensation, and it has the potential to be widely used.