Research On Heat And Mass Transfer Of The Adsorption-Regeneration Intergrated Dehumidifier

Solid adsorption dehumidifier has a unique advantage on micro-environment’s dehumidification, which has a high standard on their humidity’s control. For lack of dehumidifier suitable to these cases, an adsorption-desorption integrated dehumidifier is proposed, with a PTC heater inside, this dehumidifier can finish regeneration process without extra hot air generate equipment, comparing with traditional solid dehumidifier, it has less moving components and is convenient in regeneration process. Relative theoretical and experimental researches on the dehumidifier’s dehumidification and regeneration behavior is made.Unsteady state two-dimension mathematical model based on cylindrical coordinate for the heat and mass transfer phenomenon happened in dehumidifier’s working process is established, and relative numerical procedure is programmed to solve the controlling equations. After gaining the solution, the dehumidifier’s basic operating date and the influence of size on behavior can be gain, then recommended size value can be given. At the same time,by changing calculating parameters, the influence of inlet temperature and humidity, regeneration temperature, air flux on the dehumidifier’s behavior can also be investigated.In order to investigate the dehumidifier’s distinct behavior in different working conditions and inspect the numerical solution’s correctness, further experimental research on a dehumidifier entity is made, and the result is compared with analogue value. After regeneration, it can be found that the temperature filed is not uniform, which leading to a unsatisfactory regeneration effect. To solve this problem, structural optimization is made, and relative experiment is conducted. In addition, different working behaviors with different desiccant filled is investigated, and a mathematical description for the dehumidifier’s pressure drop characteristic can be given out.Results show that the dehumidifier has a high dehumidification efficiency for both indoor air with high moisture content in summer and relatively dry air in winter without inner-cooling device, but the regeneration process can not provide so dry desiccant which can provide due dehumidification efficiency. By optimizing structure, the dehumidifier get a huge promotion on its behavior, including a higher dehumidification efficiency and less time consumed in regeneration process. In addition, the dehumidifier remains excellent behavior when the desiccant is changed, which make the dehumidifier can be widely used in dehumidification for micro-environment.