叉流除湿器传质性能实验研究

小型溶液除湿空调叉流再生器性能的实验研究纪亚琨;丁国忠;陈想;李永珍【摘要】基—小型溶液除湿空调系统,搭建了叉流再生器性能实验平台,选用Celdek规整填料作为热质传递介质,LiCl溶液作为再生剂,并以再生量作为性能评价指标.实验研究了在小型化条件下溶液流量、溶液入口温度,空气流量、空气入口温度等四个因素对叉流再生器性能的影响.结果表明:在小型化条件下,溶液再生量随溶液流量、溶液入口温度、空气流量的增大而增大,而空气入口温度对溶液再生量影响甚微.同时,还拟合出适用—小型化的传质系数关联式,并利用热湿传递理论模型将实验值与理论计算值进行对比,结果显示误差控制在±9%范围内,精度较高.%The cross-flow regeneration experimental equipment was set up based on the small liquid desiccant air conditioning system.The Celdek structured packing was chosen as the heat and mass transfer medium,LiCl was served as regenerant,and the regenerated capacity was selected as the evaluation criteria for system performance. The effects of liquid desiccant flowrate,liquid desiccant inlet temperature,air flowrate and air inlet temperature on the performance of the regenerator were fully studied. The conclusion was that:under the condition of miniaturization,the regenerated capacity increased with the growth of solution flowrate,liquid desiccant inlet temperature and air flowrate;while air inlet temperature had little effect on the regenerated capacity.Moreover,the correlation formula of mass transfer coefficient about miniaturization system was fitted, and it was adapted to compare the experimental values with calculated values,the results showed that the deviation of each parameter wascontrolled within the range of 9%,which indicated that the fitted correlation formula had a good performance.【期刊名称】《武汉工程大学学报》【年(卷),期】2018(040)002【总页数】4页(P233-236)【关键词】溶液除湿空调;叉流;再生器;传热传质【作者】纪亚琨;丁国忠;陈想;李永珍【作者单位】华中科技大学能源与动力工程学院,湖北武汉430074;华中科技大学能源与动力工程学院,湖北武汉430074;华中科技大学能源与动力工程学院,湖北武汉430074;华中科技大学能源与动力工程学院,湖北武汉430074【正文语种】中文【中图分类】TB66近年来溶液除湿空调系统［1］受到广泛关注与研究，现已成功应用于大型中央空调系统中［2-3］。

文章编号:〇253 -4339(2017) 06 -0001 -06doi :10. 3969/j. iwn. 0253 -4339. 2017. 06. 001高效填料型除湿器新传质关联式实验研究王凌士肖赋陆韬(香港理工大学屋宇设备工程学系香港999077)摘要填料作为溶液除湿器的重要部件，其传质特性直接关系到整个溶液除湿空调系统性能的好坏。

本文搭建了逆流填料型 溶液除湿实验台，以L iC l溶液为除湿溶液，对髙比表面积波纹纤维规整填料（650 m2/m3)进行了除湿实验研究。

以气液界面的 水蒸气分压差为传质驱动力，获得了新的传质系数实验关联式和除湿效率实验关联式。

并对该填料的除湿效果与文献中的不同 填料进行对比。

结果表明:该填料具有最髙的单位体积传质系数，且填料的单位体积传质系数随着填料比表面积的增加而增大。

传质系数实验关联式计算值与实验值相对偏差在±20%以内，除湿效率实验关联式计算值与实验值相对偏差在±15%以内。

新 的传质关联式可以比较精确的计算除湿器的传质性能。

关键词溶液除湿;传质系数;效率;实验关联式;蒸气压差中图分类号:TU834. 9;TK124 文献标识码:ANew Experimental Correlations for the Mass Transfer of a High-efficiencyPacked-type DehumidifierWang Lingshi Xiao Fu Lu Tao(Department ol Building Services Engineering，The Hong Kong Polytechnic University，Hong Kong，999077，China) Abstract The packing is a crucial part of a liquid-desiccant dehumidifier，and its mass-transfer characteristics have a great impact on the overall performance ol liquid-desiccant-based air-conditioning systems. An experimental test rig was built to study the performance of a counter-flow packed-type liquid-desiccant dehumidifier that employs cross-corrugated cellulose-structured packing with a high specific sur­face area (650m2/m3). A LiCl aqueous solution was used as the desiccant solution. The water-vapor pressure difference between the gas and liquid interface was considered as the mass-transfer-driven force. New experimental correlations for the mass-transfer coefficient and the dehumidification effectiveness were developed. The performance of this type of packing was compared with other types of packing in the literature. The results show that this type of packing has the highest volumetric mass-transfer coefficient. In addition，the volumetric mass-transfer coefficient is found to increase with the specific surface area of the packing. The deviations between the experimental data and the predicted data using the experimental correlation for the mass-transfer coefficient are within ±20%，and within ±15%for the dehumidification effectiveness. This indicates that the two new correlations can be used to accurately predict the mass-transfer performance of a dehumidifier.Keywords liquid desiccant；mass transfer coefficient；effectiveness；experimental correlation；vapor pressure difference由于传统空调系统在较低温度下需要对空气冷 凝除湿，导致空调能耗增加。

紧凑式双级并联液体溶液除湿器性能研究摘要液体溶液除湿系统利用低表面蒸汽压力的溶液，如氯化锂,溴化锂,氯化钙，三甘醇等实现对处理空气湿度的调节。

具有调节湿度恒定，能够利用50-80℃的低温位热能（如太阳能，余热等）再生等突出优点。

另外，这种除湿系统还具有除湿调节范围大，可用作全新风系统实现有效能量回收等特点，因而近年来得到深入研究和关注。

本文提出一种并联双级液体溶液除湿系统，该系统由两级除湿模块并联供液,可独立调节供液量, 一定程度上克服了常规液体除湿装置传质动力小,气液流量比调节不灵活的缺点，有效地实现了湿负荷高效处理，并提高了除湿效率和除湿量，采用了级间冷却克服绝热除湿过程混合热效应所带来的不利影响。

此外，除湿模块末端可以添加蒸发冷却器，实现热湿负荷独立处理。

本文对该系统实验台的四大模块设计，配电系统的设计，部件选型做了详细研究。

同时，对不同工况以氯化钙溶液作为除湿剂进行了实验分析，发现除湿两极增加中间冷却，除湿效率提高至接近50%，并将实验结果同溶液除湿器叉流传热传质模型的数值解进行了比较，对并联双级液体除湿器除湿性能在不同工况下进行了数值分析，并对其在给定工况下对系统的填料长度，流量在两级的分配（改变两级的气液流量比）进行了优化，发现第一级和第二级溶液流量比为0.4左右可达到参考工况下最佳除湿效果(除湿效率为53.9%)。

本文还对该系统的再生模块进行了数值模拟。

关键词：液体除湿，并联供液，叉流，模块，除湿效率，优化Theoretical and experimental study on Compact parallelingliquid desiccant dehumidifierABSTRACTLiquid desiccant dehumidification system, utilizing desiccant solution with low surface pressure, such as lithium chloride, lithium bromide, calcium chloride, to realize the humidity handling of process air. This system is featured by stable humidity control, the extensive use of low grade energy (such as solar energy, waste heat, etc..) to serve the purpose of regeneration. In addition, this system is characterized by wide humidity regulation, all fed-in fresh air to realize effective energy recovery. Therefore, it receives in-depth study and wide attention.This thesis proposes a parallel two-stage liquid desiccant dehumidification system. It consists of two parallel dehumidification modules with indispensable regulation on desiccant fed-in, which effectively overcomes the disadvantages of conventional liquid desiccant dehumidification systems, such as low mass transfer driving force, inflexible regulation of solution air ratio. Meanwhile, this system effectively realizes systematic handling of latent load, and the cooling module between the stages reduces the adverse effect of mixing heat occurring during the moisture removal process. Furthermore, evaporating cooler could be added at the end of the dehumidification modules to achieve the independent handling of sensible load and latent load of process air.This thesis detailed the design of four primary modules, electricity distribution system, as well as the selection of components. Meanwhile, this thesis made experimental investigations into the system with calcium chloride as the working desiccant, and the experimental values agree with the ones worked out by the cross heat and mass transfer mathematical model. And it is found that the addition ofcooling between two stages considerably rises the dehumidification efficiency up to 50%.In addition, this thesis carried the numerical analysis into this system under different operating conditions, and make extensive comparisons between this system and conventional ones, and the optimization values for the dimensions of packing materials and allocation of solution between stages are provided. It is found that the solution allocation ratio 0.4 between two stages will yield highest dehumidification efficiency(53.9%) and moisture removal rate. In the end, the thesis carried out numerical analysis into regenerating module.Key word: Liquid desiccant dehumidification, parallel fed-in, cross flow, module, dehumidification efficiency, optimization主要符号A 面积(m 2) P大气压(kPa) pC 空气的比热容(kJ/kg ·K)D 空气绝对湿度(g/kg) d 布液器小孔直径(mm)e 布液器小孔间距(mm) E 除湿效率f 填料层间距(mm) F 布液器距填料距离(cm)h 传热系数(W/m 2) a h湿空气的焓(kJ/kg)e h 热湿交换平衡时空气的焓(kJ/kg)m h质量传递系数(kg/m 2·s)z h 除湿剂的焓(kJ/kg) H 填料高度(cm)J 布液器排管间距(cm) K 气液流量比l 布液器管长(cm) L 填料长度(cm)Le 刘易斯数 .m 质量流量(kg/s)M 布液器送液体能力(m 3/h)NTU 传质单元数n 布液器小孔数 Q 换热量(KJ)Re 雷诺数 RH 空气相对湿度r 汽化潜热(kJ/kg) Sh 舍伍德数Sc 斯密特数 t 温度(℃)w T 湿球温度(℃) u 流速(m/s)V 体积(m 3) W 填料厚度(cm)α 填料层波纹角 β 填料层波纹角θ 角度 ε 填料空隙率η 质扩散率(m 2/s) σ 填料比表面积(m 2/m 3)ρ 密度 kg/m 3 ψ 填料润湿率φ 蒸发冷却器冷却效率 下标a空气c 冷流体 e 气液蒸汽压平衡h 热流体 in 入口out 出口 s 溶液上海交通大学学位论文原创性声明本人郑重声明：所呈交的学位论文，是本人在导师的指导下，独立进行研究工作所取得的成果。

文章编号:　1005—0329(2005)12—0061—04液体除湿空调系统的除湿器性能试验柳建华1,邬志敏1,丁育红2,顾卫国1(1.上海理工大学,上海　200093;2.苏州高新技术开发区建设工程质量监督站,江苏苏州　215011)摘　要:　以实际液体除湿空调系统为对象,对其进行实验研究,改变系统中除湿器入口空气及溶液的参数,得出空气出口温、湿度随之变化的状况。

并与理论模拟计算值比较,获得实验值和理论值有相同的变化趋势的试验数据。

实验得出在诸多的入口参数中,溶液的温度和流量的变化对空气出口温、湿度影响较大,空气的出口温度实验值偏小于理论值,空气的出口湿度实验值偏大于理论值。

试验结果可对液体除湿空调系统的性能分析和设计提供帮助。

关键词:　液体除湿空调系统;除湿器;性能分析中图分类号:　TU834.4 文献标识码:　AStudy on the Performance of Dehumidifier in the Liquid Desiccant Air Conditioning SystemLIU Jian -hua 1,WU Zhi -min 1,DING Yu -hong 2,GU Wei -guo 1(1.University of Shanghai for Science and Technology ,Shanghai 200093,China ;2.Suzhou New Diastrict Construction Engineering Qulity Control &Supervision Station ,Suzhou 215011,China )A bstract :　Through changing the inlet parameters of the dehumidifier ,the experiment value of its outlet air temperature and humidity are obtained .The experiment results indicating both of the experiment value and the calculating value have same variety trend ,the solu -tion temperature and flux have larger affect among all inlet parameters etc .,these would provide help for the design and performance analysis of the liquid desiccant air -conditioning s y stem .Key words :　liquid desiccants air conditioning system ;dehumidifier ;performance analysis收稿日期:　2005—08—26基金项目:　上海市重点学科建设项目(T0503);上海市科委世博科技专项基金(05dz05827);国家科技部世博科技专项基金(2005BA908B27)1　前言液体除湿空调系统对驱动热源的要求较低,一般的工业余热、废热以及地热、太阳能等可再生的低品位能源均可利用,且不受制冷剂禁用的限制,具有广阔的应用前景。

太阳能叉流液体除湿空调再生热质传递稳态实验高文忠;柳建华;章学来【摘要】Regenerator is one of the core components in a liquid desiccant air-conditioning system driven by solar energy, and its efficiency directly affects the performance of the system. The feasibility to obtain outlet parameters for the regeneration from its efficiency and import parameters was analyzed, and a cross-flow regenerator was established, in which LiCl solution and Celdek structured packing were used. Enthalpy efficiency and moisture efficiency were adopted to describe the heat and mass transfer performance of the regenerator. Influences of desiccant and air inlet parameters on the regenerator performance were experimentally investigated. The results show that the enthalpy efficiency is mainly affected by the flow rate and temperature of the solution, and the flow rate, temperature and moisture content of air. The moisture efficiency depends on the flow rate, temperature and concentration of the solution as well as the flow rate of air, but has little relationship with other variables. The error between the linear regression equation and experimental data is less than 20% . Thus the outlet state can be predicted from inlet parameters.%再生器是太阳能液体除湿系统的核心设备,其效率直接影响整个系统的性能.分析了再生器出口参数由进口参数和效率直接获得的可行性,并建立叉流液体再生系统,采用氯化锂为再生溶液,Celdek填料为热质交换介质,实验测试溶液和空气进出口参数对再生器全热效率和湿度效率的影响规律,并进行线性回归,结果表明:全热效率主要受溶液流量、温度以及空气流量、温度和含湿量的影响；湿度效率和溶液流量、温度、浓度以及空气流量关联性强,与其他变量关系很小;线性回归方程计算结果和实验结果误差基本在20％以内,可通过进口参数预测出口状态.【期刊名称】《化工学报》【年(卷),期】2011(062)010【总页数】6页(P2747-2752)【关键词】叉流再生器;传热传质;全热效率;湿度效率【作者】高文忠;柳建华;章学来【作者单位】上海海事大学商船学院,上海201306;上海理工大学能源与动力学院,上海200093;上海理工大学能源与动力学院,上海200093;上海海事大学商船学院,上海201306【正文语种】中文【中图分类】TQ028.8溶液除湿空调系统由于其在去除潜热负荷方面的优越性,并可以采用工业废热、太阳能等低品位热源驱动,近年来得到较快的发展,特别在高湿地区,其优势更加明显[1-5]。

叉流除湿器中溶液与空气热质交换模型3清华大学　刘晓华☆　江　亿　曲凯阳　陈晓阳摘要　建立了简化数学模型,空气出口温度和含湿量、溶液出口温度和质量分数的数值计算结果与实验结果的偏差在±10%以内,全热效率和除湿效率的偏差在±20%以内。

通过分析除湿器内部温度场和浓度场得出:在叉流除湿器中,不能忽略空气温湿度沿溶液流动方向和溶液温度沿空气流动方向的变化;传质驱动势要采用积分平均湿差的方法计算,而不能简单地采用对数平均湿差来表示。

关键词　叉流除湿器　传热传质　数学模型　实验He at a n d m ass tra nsf er m o d el b etw e e n air a n dliq uid d esic c a nt in cross 2flow d e h u midifiersBy L i u Xi a ohua★,J i a ng Yi ,Qu Ka i ya ng a nd Che n Xi a oya ngAbstract Establishes a simplified heat and mass transfer model.The numerical results ,including air outlet temperature and humidity ratio ,liquid desiccant outlet temperature and concentration ,overall heat efficiency and dehumidifier efficiency ,accord well with the experimental data with the maximal difference less than 10%for the formerfour parameters and 20%for the latter tw o.Based on the analysis of temperature and concentration distribution within the dehumidifier ,several conclusions can be gained :the changes of air temperature and humidity ratio in liquid desiccant flow direction and the change of liquid desiccant temperature in air flow direction cannot be omitted ;integral average m oisture difference instead of logarithmic average m oisture difference should be used to describe mass trans fer driving potential in cross 2flow con figuration.Keywords cross 2flow dehumidifier ,heat and mass transfer ,mathematical model ,experiment ★Tsinghua University ,Beijing ,China　3国家自然科学基金资助项目(编号:50276029)0　引言填料式液体除湿装置是最常见的液体除湿设备之一,很多学者通过实验对空气与除湿溶液的热质交换过程进行了研究。