Dehumidification capacity and exergy efficiency of desiccant wheel are studied and researched in this paper. Energy-based effectiveness is employed to evaluate the performance of silica-gel desiccant wheel, such as sensible heat efficiency, latent heat efficiency and dehumidification coefficient of performance. And the exergy efficiency model is also presented, and the exergy and exergy efficiency of channel are analyzed using a one-dimensional coupled with heat and mass transfer mathematical model and experimental setup based on adsorption channel. The factors of influence on the performance and exergy efficiency, the regenerative temperature, the temperature and humidity of the inlet process air, are investigated using exergy efficiency model, and results show the exergy efficiency is lower because the proportion of chemical exergy component. It shows that the optimal regeneration temperature is 100 ℃ for silica gel wheel. Meanwhile, with the increase of regenerative temperature, its energy efficiency reduces contrarily. It also shows that the higher the temperature and humidity of the inlet process air are, and the higher the latent efficiency is. But with the increase of the inlet process air temperature, the air can contain more humidity so that dehumidification coefficient of performance (DCOP) is reduced.%讨论了能量第一定律和第二定律在除湿转轮中的应用,分析了除湿转轮在几何尺寸、运行状态一定的情况下能量效率和火用效率,并建立了除湿转轮的火用效率模型.以显热效率、潜热效率和除湿性能系数以及火用效率作为评价指标,通过对除湿转轮的一维单通道传热传质模型实验分析了影响硅胶除湿转轮火用效率及除湿性能的因素,研究了运行参数(处理空气进口湿度、温度及再生温度)对转轮除湿性能的影响.实验研究发现在近工况下,硅胶除湿转轮除湿性能系数在再生温度为100 ℃时为最佳,同时火用效率随着再生温度的升高而降低,在100 ℃时趋于平缓.研究同时表明提高进口处理空气的温度、湿度能够提高除湿转轮的显热效率和潜热效率,但是由于进口温度的升高导致空气的容湿能力提高而使得除湿性能系数降低.
展开▼
