除湿转轮传热传质数值研究与性能优化

Numerical study on heat and mass transfer of desiccant wheel and dehumidification performance optimization

为了研究除湿转轮吸附和脱附时发生的传热传质现象以及除湿性能优化,文中提出了硅胶除湿转轮的三维数学模型。数值求解过程在Fluent软件中实现,并且相关的控制方程由用户自定义标量方程(UDS)来重构。结果显示,该数学模型的预测结果与参考文献的实验数据更为吻合。当送气/再生面积比SR从0.3到0.7变化时,除湿性能下降而送风量增大;当转轮厚度L从50到300 mm增加时,除湿性能增加而流动阻力增大。最终确定合理的参数为SR=0.5和L=200 mm,此时2 m/s风速的压力降为110 Pa。

In order to study the heat and mass transfer phenomena and dehumidification performance optimization during adsorption and desorption process,a three-dimensional mathematical model for silica gel desiccant wheel was proposed in this paper.The numerical solution process was implemented in the Fluent software,and the related governing equation was reconstructed by user defined scalar equation(UDS).The results show that the predictions of the mathematical model are more consistent with the experimental data from the literature.On the one hand,when the supply/regeneration section area ratios(SR)vary from 0.3 to 0.7,the dehumidification performance decreases and the air supply increases.On the other hand,while the thickness L increases from 50 to 300 mm,the dehumidification performance and the flow resistance increase.At the end,the reasonable parameters are determined as SR=0.5 and L=200 mm,and the pressure drop at 2 m/s is 110 Pa.