Abstract:

It’s very important to control the humidity of museums’ display cases. In order to realize the function of keeping display cases’ humidity constant automatically, a method is proposed to automatically supplement water tank of humidity-constant cases with environmental water vapor, which is based on the principle of adsorption. Then a corresponding small air water intake device is built to proves the feasibility of this method. At the same time, the mathematical model of the air intake device coupled with heat and mass transfer is constructed. After the influence of the ambient temperature and humidity on the water intake performance of the device is obtained, the influence of the heating power and the structure of the adsorption bed on the water intake per unit energy consumption of the device is analyzed. In addition, two dimensionless parameters based on the height and diameter of the adsorption bed are proposed for the later application of the device. The results show that the temperature of the inlet air has little influence on the water intake performance, but the humidity of the inlet air has an obvious difference on the device’s performance. And the water intake increases with the increase of environmental relative humidity. There is an optimal value of heating power, and the water intake per unit energy consumption increases first and then decreases with the increase of heating power. Under the current combination of geometric parameters, the water intake per unit energy consumption of the device is the highest when two dimensionless parameters η is 2, β is 4.

Key words: adsorption, water intake, museum display case, heat and mass transfer

摘要：

博物馆恒湿文物展柜的湿度控制至关重要，为实现展柜的自动恒湿功能，本文基于吸附式空气取水原理，提出了一种将环境水汽自动补充至恒湿文物展柜系统水箱的方法，并搭建了相应的小型空气取水装置，证明了该方法的可行性；同时，构建了传热传质耦合的空气取水装置数学模型，在获取环境温湿度对装置取水量的影响规律后，分析加热功率和吸附床结构对装置单位能耗取水量的影响；此外，为便于装置的后期推广应用，提出了两个基于吸附床高度和直径的量纲为1参数。结果表明：进口空气的温度对取水量影响较小，但进口空气的湿度对取水量影响较明显，取水量随着湿度增加而增加；加热功率存在最优值，单位能耗取水量随着加热功率先增大后减小；在当前几何参数组合下，两个量纲为1参数η=2、β=4时，装置的单位能耗取水量最高。

关键词: 吸附, 空气取水, 恒湿文物展柜, 传热传质