空气冷凝换热器模拟中几个问题的研究

STUDY ON SIMULATION OF AIR CONDENSER

本文建立了空气冷凝换热器简化动态模型及凝结液膜厚度模型。利用该模型计算了膜状凝结时液膜厚度和速度沿流程的分布,结果表明在计算时可以忽略液膜的导热热阻;通过对简化模型的分析发现在一定条件下冷凝换热器通道内的湿空气可能达到过饱和状态,但分析表明不会产生结雾,计算时不需要考虑;通过分析及计算发现冷凝换热器存在最佳去湿流量,使得去湿量最大,在对载人飞船进行湿度和温度控制时要考虑这一因素。

A simplified dynamic model of air condenser and the model of its liquid film are driven in this paper. The distribution of thickness and speed of liquid film along the tube is calculated by these models, and the results indicate that conductive resistance of liquid film can be neglected in the model. The analysis by a simplified model of the moist air in condenser finds that moist air can be oversaturated under some conditions, but fog will not accur. The condener has best flux of air to get maximum dewetting. This characteristic is usefull for control of temperature and humidity in cabin of spacecraft.