可降水量及云层覆盖率对天空辐射制冷性能的影响

Effect of Precipitable Water and Cloud Coverage on Performance of Radiative Sky Cooling

为了研究可降水量及云层覆盖率与天空辐射制冷性能之间的关系,本文建立了完整的天空辐射制冷数学模型,设计并开展了辐射制冷性能测试实验,研究了上述两项因素在不同工况下对辐射制冷性能的影响。实验结果表明:随着可降水量增加,辐射制冷功率下降趋势加快。模拟结果表明:测试表面在1.5、3.0和6.0cm这3种可降水量条件下,对应的最大净辐射制冷功率分别为112、88和46W/m^(2)。云层覆盖率与辐射制冷功率损失呈明显的线性关系,云层覆盖率每增加10%,辐射制冷功率损失约8.3 W/m^(2)。

To investigate the effect of weather conditions on radiative cooling performance,a comprehensive mathematical model of radiative sky cooling is developed and experiments to test the performance in real-world conditions are conducted.The effect of the precipitable water and cloud coverage under different conditions are investigated.Results show that as the content of precipitable water vapor increases,the cooling power decreases with an accelerating trend.When the precipitable water vapors are 1.5 cm,3.0 cm,and 6.0 cm,the maximum net cooling powers are 112 W/m^(2),88 W/m2 and 46 W/m^(2),respectively.A linear relationship has been observed between cloud cover and radiative cooling power loss.For each 10%increase in cloud cover,the loss of cooling power is about 8.3 W/m^(2).