Theoretical And Experimental Study On Dehumidification Performance Of Solid Desiccant Wheel

Compared with other dehumidification way, rotary dehumidifier has good dehumidifying performance. In real life and production, wheel dehumidifier is used more widely. At present, desiccant wheel dehumidifying technology is in a hot research stage, and desiccant as the heart of dehumidifier, the performance of the quality will directly be related to the whole performance of the desiccant system, so it has been important research direction in the field all the time.Aiming at the structure characteristics of the cellular desiccant wheel dehumidifier as well as the heat and qualitative characteristics of corrugated channel, to a single channel within desiccant wheel as the research object, some assumptions to simplify desiccant wheel heat and qualitative are given, and establish one-dimensional heat and mass transfer model. According to the quality and the law of conservation of energy, heat and qualitative control equations of desiccant wheel desiccant side and air side were obtained, and combine with supplementary equations and boundary conditions, use MATLAB platform to solve calculation.Using the received mathematical model, simulate calculation of silica gel runner to 500mm x 200mm, draw processing air condition parameters of processing air export (temperature and moisture content) with the change of operation parameters. Keeping other parameters constant, processing air exit temperature and moisture content is along with the increases of air inlet temperature and moisture content. Along with the increase of regeneration air inlet temperature, processing air export moisture content is reduced, while the temperature is increased. The size of regeneration air inlet moisture content has little influence on the processing air export temperature and moisture content. There exists optimal value for the wheel speed to make the processing air moisture content by runner the lowest. Temperature at this moment is in equilibrium.This article introduces two indexes to assess the performance of wheel dehumidifier: dehumidifying capacity D and dehumidification performance coefficient DCOP. Building the experimental platform of wheel dehumidifying performance test, the silica gel desiccant wheel to 500m x 200mm is used to make experiment research, and operation parameters on the influence of runner dehumidifying performance is analyzed. Processing air inlet temperature increased from 24℃to 32℃, dehumidifying capacity reduced 1.63 g/kg dry air, and DCOP decline of roughly 28.6%; when processing air inlet moisture content increases, dehumidifying capacity and dehumidification performance coefficient were significantly enhanced. When processing air is in 1,200 m~3/ h, dehumidifying capacity is the maximum; Dehumidifying performance coefficient with the variation of processing air is not very big. Regenerative temperature increases, dehumidifying capacity will also increase, and dehumidification performance coefficient decreases. The size of regeneration air inlet moisture content has not clear influence on the wheel dehumidifier dehumidifying capacity D and coefficients of performance DCOP. The greater flow of regeneration air, the better effect of the wheel dehumidifier, after reaching a critical value, dehumidifying capacity and dehumidification performance coefficient remained stable. Desiccant wheel exist the best speed, and dehumidifying capacity is maximum, in the most optimal speed near, dehumidifying performance coefficient changes not obviously.