直接接触式恒湿设备中热湿交换水箱的结构优化分析

Structural optimization analysis of heat and mass transfer water tank in direct contact constant humidity equipment

直接接触式恒湿设备对环境湿度的调控效果受到其热湿交换水箱中空气与水热湿交换效率的制约,为提高空气与水的热湿交换效率,在深入分析传热传质机理的基础上,利用CFD软件建立了三维热湿交换水箱的数学模型,对3种不同结构水箱内的空气处理过程进行了模拟分析。结果表明,较大的空气流速可以获得较高的传热传质速率;水箱中增加导流板能提高空气与水的湿交换速率;"上送上回"式水箱中传质速率受液位高度变化的影响最小,且始终能保持最好的湿交换效果。

The effect of direct-contact constant-humidity equipment on environment humidity is restricted by the heat and mass transfer efficiency of the air and water inside the water tank. In order to enhance the heat and mass transfer efficiency between air and water. 3 D mathematical model was established utilizing the software CFD based on an in-depth analysis of heat and mass transfer mechanism. Air treatment processes in three different types of tank structure were simulated and analyzed. Simulation results indicate that heat and mass transfer rates increase as air velocity increases; water tanks with baffle is able to accelerate the air-water moisture exchange rate compared with non-baffled water tanks. The mass transfer rate of air and water in water tank supplying and returning air all from the top is minimally affected by changes in liquid level height and the best mass transfer efficiency is also obtained during the situation.