Performance Analysis Of Ultrasound Atomization Dehumidifying System With Liquid Desiccant

Based on the conception of dehumidification with liquid desiccant making use of the ultrasound atomization technology, a new kind of ultrasound atomization dehumidifying system with liquid desiccant was designed, and an experiment bench was constructed for the performance analysis of the system. The mixed salt solution of Lithium chloride and Calcium chloride with the mass ratio 1:1 was used as the liquid desiccant in the system. The efficiency of the system was studied by different experiments. It's found that the dehumidification efficiency of this system is 18.1%~26.9% under 9 groups of experimental conditions. In additional, the effects of quality concentration of calcium chloride and lithium chloride mixture solution, liquid-air ratio and air-liquid reaction time were analyzed according to experimental data. It's found that the efficiency decreases when the salt quality concentration decreases from 38% to 35%; liquid-air ratio and air-liquid reaction time greatly affect the dehumidification efficiency. Increasing the reaction time helps improve efficiency of the ultrasound atomization dehumidifying system with liquid desiccant. Besides, the efficiency increases 50% when the liquid-air ratio increases from 0.18 to 0.84. Moreover, the temperature of the processed air is raised by 0.66℃~1.48℃when the efficiency increases.Mathematical model was established to predict efficiency of the ultrasound atomization dehumidifying system with liquid desiccant under different conditions. Results from the mathematical analysis could be used for the optimization of the system. It's found that increasing the liquid-air ratio when it's less than 1.0 could help improve the performance significantly. Meanwhile, if the value is higher than 1.0, keeping increasing the liquid-air ratio does not work well. Besides, increasing the air-liquid reaction time also improves the efficiency of the dehumidification system. However, relationship between the reaction time and liquid-air ratio is very complicated, and they are affected by each other. Through the mathematical analysis, it's found that the reaction time is less than 1.6s if the liquid-air ratio is 0.2, but the reaction time could be reduced to 0.3s by increasing the liquid-air ratio to 1.0. However, raising the liquid-air ratio means increasing the consumption of the solution, so increasing the reaction time to improve the performance without increasing the cost of solution is preferred. The mass transfer coefficient during the dehumidifying process is increased by atomizing the liquid desiccant into droplets with the diameter about 50μm, which is appropriate for the ultrasound atomization dehumidifying system with liquid desiccant.An optimized ultrasound atomization dehumidifying system with liquid desiccant was designed according to the results of the mathematical analysis, of which the dehumidification efficiency is improved and the space utilization is more reasonable.At last, based on the research of ultrasound atomization dehumidifying system, a liquid desiccant regenerating system was proposed by optimizing traditional regenerator. The ultrasound atomization dehumidifying and regenerating system was designed, of which the dehumidification and regeneration efficiency is improved, and the energy consumption is lower by reducing the system resistance. Besides, the solar energy and industrial waste heat could be used in this ultrasound atomization dehumidifying and regenerating system.