管式蒸发冷却下LiCl-CaCl_(2)混合溶液降膜除湿特性分析  

Analysis on falling film dehumidification characteristics of LiCl-CaCl_(2)mixed solution under tubular evaporative cooling

作　　者：彭冬根[1] 骆莹莹 殷勇高[2] 徐少华[1] Peng Donggen;Luo Yingying;Yin Yonggao;Xu Shaohua(School of Infrastructure Engineering,Nanchang University,Nanchang 330031,China;School of Energy and Environment,Southeast University,Nanjing 210096,China)

机构地区：[1]南昌大学工程建设学院,南昌330031 [2]东南大学能源与环境学院,南京210096

出　　处：《东南大学学报（自然科学版）》2024年第4期1014-1021,共8页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金国际(地区)合作交流资助项目(52111530131);南昌大学江西省财政科技专项“包干制”试点示范资助项目(ZBG20230418019)。

摘　　要：针对绝热型溶液除湿器性能低下的问题,设计了一种管式蒸发冷却型溶液除湿器,并采用具有较高经济性的LiCl-CaCl_(2)混合溶液作为除湿剂.基于理论模型,数值模拟了混合溶液中LiCl、CaCl_(2)两组分混合质量比、溶液参数和空气参数对蒸发冷却及绝热工况下除湿器热湿传递特性的影响.结果表明,除湿器在蒸发冷却工况下的单位面积除湿率高于绝热工况,最高可提升41.5%,且溶液中LiCl质量分数越小,其性能优势越显著.蒸发冷却除湿优势受溶液温度影响显著,单位面积除湿率与除湿空气流量呈正相关,与溶液流量呈负相关.不同的LiCl-CaCl_(2)混合质量比下蒸发冷却除湿特性主要受溶液温度影响,且在溶液温度较低时降低LiCl质量分数对除湿性能影响较小.2种运行工况下空气流量对除湿器单位面积除湿率的正向提升率可达136.9%~168.1%,而溶液流量对其影响较弱.Aiming at the low performance of adiabatic solution dehumidifiers,a tube evaporative cooling solution dehumidifier was designed,and LiCl-CaCl_(2)mixed aqueous solution with high economy was used as the liquid desiccant.The effects of the mass ratio of LiCl and CaCl_(2),solution parameters and air parameters on the heat and humidity transfer characteristics of the dehumidifier under evaporative cooling and adiabatic conditions were numerically simulated using the theoretical model.The results show that the dehumidification rate per unit area of the dehumidifier under evaporative cooling condition is higher than that under adiabatic condition with the increase proportion of up to 41.5%.The smaller the mass fraction of LiCl in the solution,the more significant the performance advantage.The dehumidification advantage of evaporative cooling is significantly affected by the solution temperature.The dehumidification rate per unit area is positively correlated with the dehumidification air flow-rate and negatively correlated with the solution flow-rate.The dehumidification characteristics under evaporative cooling with different mixed mass ratios of LiCl and CaCl_(2)are mainly affected by the solution temperature.When the solution temperature is low,the effect of the decrease of the mass fraction of LiCl on the dehumidification performance is little.Under the two operating conditions,the positive improvement rate of the air flow-rate on the dehumidification rate per unit area of the dehumidifier reaches 136.9%to 168.1%,while the effect of solution flow rate is weak.

关 键 词：蒸发冷却 除湿 水溶液 混合质量比 数值模拟 

分 类 号：TU834.9[建筑科学—供热、供燃气、通风及空调工程] TK124[动力工程及工程热物理—工程热物理]