关键词: 吸附, 空气取水, 恒湿文物展柜, 传热传质

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