Study On The Characteristics Of Electro-osmotic Regeneration And Dehumidification Performance Of Novel Dehumidification Fins

In the air conditioning system,the energy consumption of dehumidification is about 20%-40% of the total energy consumption,which is full of potential to be further improved.Based on novel dehumidification fin,which is proposed in the previous work by utilizing the technology of electro-osmotic regeneration,this study aims to explore the characteristics of the composite desiccant sheet and the dehumidification fin respectively,which help evaluate the application potential of electro-osmotic technology in the field of air dehumidification.This methodology should be able to provide a possible way on the weakly coupled control of temperature and humidity in the air conditioning systems.In order to enhance the moisture adsorption and structural stability of the dehumidification fins,this study select the mixing method to fabricate the key component of the dehumidification fin,which is the composite desiccant sheet.The mixed raw materials include the discolored silica gel,adhesive and hygroscopic salt.The mixture ratio and fabrication parameters are determined from orthogonal design experiment.Static adsorption and mechanical strength tests are designed to obtain the characteristics of moisture adsorption and structural stability.Based on a comprehensive evaluation,the composite desiccant sheet is selected with silica gel in the particle size of 0.1-0.2mm,the adhesive is hydroxypropylmethylcellulose(HPMC),the mass ratio of silica gel to HPMC is 3:1,the hygroscopic salt is lithium chloride(Li Cl)with an appropriate content of 27.3%,and the fabrication pressure is 12 MPa.As the dehumidification process includes the moisture absorption and the electro-osmotic migration in the composite desiccant sheet,experimental studies are applied to analyze the electro-osmotic effect,and further investigate the impact factors(such as the structure factors and ambient factors)related to the regeneration rate.Through the analysis of experimental data,it is found that the regeneration rate is non-linear correlated with the field strength,reverse proportional to the pore size,and proportional to the voidage.Within the investigation range in this study,the highest electro-osmotic regeneration rate is derived with the field strength of 2.635V/m,the particle size of 0.05-0.1mm,and the voidage of 49%.Joule heat has a thermal effect on the regeneration procedure,so that the dehumidification fins may need to be cooled during application.Considering the optimal parameters derived on the moisture adsorption and structure stability,the particle sizes in the dehumidification fins are selected between 0.1 to 0.2mm.In order to simulate the application of dehumidification fins in air conditioning system,the dehumidification fins are placed in an air duct system for dynamic testing of the dehumidification performance and operation mode.Results show that the dehumidification fins can indicate a dehumidification effect to the flowing moisture air.After regenerated by the electro-osmotic effect,the dehumidification fins can be used again for the dehumidifying the moisture air.By referring to the current,a reasonable control on the electric field can be applied during operation to maintain high efficiency and continuous dehumidification.