| In order to realize the long-term preservation of precious cultural relics,museums need to set different temperature and humidity according to the types of cultural relics.At the same time,there is a need for cultural relics to be exhibited at different places,so small independent humidity-constant display cases came into being.The temperature of the display cases is regulated by the air conditioning system of the museum,and the humidity is controlled by the way of direct contact between air and water.Due to the leakage of water vapor from display cases to the museum environment,it is necessary to continuously supplement water to the water tank of the display cases.There are hidden dangers of cultural relic damage caused by adding water artificially.The water in the air is inexhaustible and can be used as the water source of the automatic water intake device.For the water intake device,the existing equipment is relatively large,and most of them extracts water form air based on refrigeration,which has high energy consumption and low efficiency and is not suitable for museums.In this paper,the special needs of independent display cases in the museum are considered and the advantages and disadvantages of various water intake methods are comprehensively analyzed,a small internal heated water intake device based on adsorption is designed,which has compact structure and low energy consumption,and it can meet the needs of automatic water replenishment for museum display cases.The main work of this paper is as follows:(1)Combined with the water replenishment demand and structural characteristics of small display cases in museums,a method for extracting water from air based on adsorption is proposed.This paper analyzes the working principle of adsorption stage and desorption stage of water intake device based on adsorption,explains the influence of ambient temperature and relative humidity on adsorption capacity theoretically,and analyzes the influence of condensation temperature on final water intake.The results show that the higher the ambient humidity and the lower the temperature,the greater the adsorption capacity of the device;the lower the condensation temperature,the higher the theoretical water intake.(2)Based on the design requirements of miniaturization and low energy consumption of the water intake device,the structure design and optimization of the main components of the device are carried out.The temperature distribution of the internal and external heated adsorbers is compared,and the internal heated radial flow adsorber is selected as the adsorber of the device.The diversion structure of the reservoir is proposed,and the influence of the diversion structure to the internal resistance of the device is analyzed through simulation.The design of the radiator is emphasized,and the pin-fin radiator is put forward,which has the advantages of compact structure and high heat dissipation efficiency.The influence of the layout of the pin-fin and the size of the pin on the heat dissipation effect is analyzed.(3)The composite adsorbent of active alumina and hygroscopic salt is prepared,and the water intake device based on the composite adsorbent is built.The performance of adsorbents under different heating power is measured and the results show that he water intake performance of lithium chloride / alumina composite adsorbent is better than that of calcium chloride / alumina composite adsorbent of the same concentration;the water intake of composite adsorbent in the designed air intake device increases with the increase of the soaking concentration of hygroscopic salt,and the optimal water intake of composite adsorbent is higher than that of ordinary activated alumina When the heating power is lower than 18 W,the water intake device can't work efficiently,and the periodic water intake increases with the increase of heating power.Finally,the feasibility of the device is verified according to the cycle time and cycle water intake of the composite adsorbent. |
PDF Full Text Request