硅胶干燥剂涂层等温除湿传质特性的数值模拟研究  

Numerical Simulation on the Mass Transfer Characteristics of Silica Gel Desiccant Coating during Isothermal Dehumidification Process

作　　者：刘林 李军[1,2] 邓立生 何兆红 白羽[1,2] 黄宏宇 小林敬幸[4] Liu Lin;Li Jun;Deng Lisheng;He Zhaohong;Bai Yu;Huang Hongyu;Kobayashi Noriyuki(Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),511458,Guangzhou,China;Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,510640,Guangzhou,China;Innovation Academy of South China Sea Ecology and Environmental Engineering,Chinese Academy of Sciences,510301,Guangzhou,China;Nagoya University,4648603,Nagoya,Japan)

机构地区：[1]南方海洋科学与工程广东省实验室(广州),广州511458 [2]中国科学院广州能源研究所,广州510640 [3]中国科学院南海生态环境工程创新研究院,广州510301 [4]日本名古屋大学,名古屋4648603

出　　处：《制冷学报》2023年第2期120-126,共7页Journal of Refrigeration

基　　金：南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(GML2019ZD0108);广州市科技计划项目(202102020235);中国科学院南海生态环境工程创新研究院项目(ISEE2021ZD04)资助。

摘　　要：吸附除湿循环存在复杂的热质耦合传递现象,其中吸附阶段干燥剂释放的吸附热会导致除湿性能下降,而理想等温除湿可有效消除吸附热影响。为研究硅胶干燥剂涂层等温除湿传质特性,本文将热质传递解耦,依托实验验证的二维共轭传热传质数值模型,模拟研究决定气固侧传质阻力的两个关键因素——空气流速和干燥剂层厚度对传质特性的影响规律。结果表明:空气流速的增加能够强化气侧传质,因而固侧传质阻力对总传质制约作用增强,吸/脱附过程Sh和Bi_(m)均增大,而干燥剂层厚度增加时,固侧传质阻力增大,吸/脱附过程Sh减小、Bi_(m)增加。特别指出,干燥剂涂层除湿过程数值建模通常需要同时考虑气固侧传质阻力影响。Complex heat and mass coupled transfer phenomena exist in a solid dehumidification cycle,where the adsorption heat released by the desiccant during the adsorption stage will reduce dehumidification performance,while ideal isothermal dehumidification can eliminate this negative effect.To investigate the mass transfer characteristics of the silica gel desiccant coating under an isothermal dehumidification process,the heat and mass transfer was decoupled,and a two-dimensional conjugated heat and mass transfer numerical model validated by isothermal dehumidification experimental results was developed.Simulations were conducted to study the impact of air velocity and desiccant layer thickness on the movement of matter.These two factors,namely,air velocity and desiccant layer thickness,affect the resistance of mass transfer on both the air and solid sides.The results show that an increase in air velocity strengthens the air-side mass transfer capacity,resulting in a relatively stronger effect of the solid-side mass transfer resistance on the total mass transfer process.As a result,both Sh and Bi_(m) increased during the adsorption and desorption processes.As the thickness of the desiccant layer increased,the solid-side mass transfer resistance increased,thereby reducing Sh and increasing Bi_(m) for the adsorption and desorption processes.In particular,both air-side and solid-side mass transfer resistances should be accounted for in the numerical modeling of the dehumidification cycle for desiccant coatings.

关 键 词：除湿 吸附式热泵 传热传质 数值模拟 

分 类 号：TB611[一般工业技术—制冷工程] TB657.5[建筑科学—供热、供燃气、通风及空调工程] TU834.9