Effects of air pretreatment and regeneration in an adiabatic ionic liquid desiccant dehumidification system

IF 5.4 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress Pub Date : 2025-09-12 DOI:10.1016/j.tsep.2025.104103

Jia-Wei Zheng , Yu-Lieh Wu , Yen-Chen Huang , Chih-Hao Chen , Jiun-Jen Chen

{"title":"Effects of air pretreatment and regeneration in an adiabatic ionic liquid desiccant dehumidification system","authors":"Jia-Wei Zheng , Yu-Lieh Wu , Yen-Chen Huang , Chih-Hao Chen , Jiun-Jen Chen","doi":"10.1016/j.tsep.2025.104103","DOIUrl":null,"url":null,"abstract":"<div><div>This study designed an adiabatic liquid desiccant dehumidification system where inlet air is precooled and preheated. Depending on the method of air intake into the regenerator, the system operates in an outdoor fresh-air mode or indoor return-air mode. The effects of air mass flow rate, air inlet temperature, inlet humidity ratio, and inlet liquid desiccant temperature on system performance were assessed in both modes. The results indicated the following. Increases in inlet air temperature reduced mass transfer efficiency but increased the coefficient of performance; increases in inlet air humidity ratio increased the vapor pressure difference, thereby improving dehumidification efficiency; and increases in liquid desiccant temperature attenuated moisture absorption capacity. When the outdoor mode was switched to the indoor mode, increases of 6.97 %, 6.87 %, 6.87 %, and 8.79 % were noted in average vapor surface partial pressure, humidity ratio difference, EF, and COP, respectively. This change in air inlet mode significantly enhanced dehumidification effectiveness to levels comparable to those achieved using a conventional corrosive adiabatic LiCl system. Precooling the inlet air enhanced dehumidification, whereas preheating improved the regeneration of ionic liquids and provided more stable inlet air conditions. The proposed system yielded energy savings of 15 % relative to a typical condensation dehumidification system.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"67 ","pages":"Article 104103"},"PeriodicalIF":5.4000,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Thermal Science and Engineering Progress","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2451904925008947","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENERGY & FUELS","Score":null,"Total":0}

引用次数: 0

Abstract

This study designed an adiabatic liquid desiccant dehumidification system where inlet air is precooled and preheated. Depending on the method of air intake into the regenerator, the system operates in an outdoor fresh-air mode or indoor return-air mode. The effects of air mass flow rate, air inlet temperature, inlet humidity ratio, and inlet liquid desiccant temperature on system performance were assessed in both modes. The results indicated the following. Increases in inlet air temperature reduced mass transfer efficiency but increased the coefficient of performance; increases in inlet air humidity ratio increased the vapor pressure difference, thereby improving dehumidification efficiency; and increases in liquid desiccant temperature attenuated moisture absorption capacity. When the outdoor mode was switched to the indoor mode, increases of 6.97 %, 6.87 %, 6.87 %, and 8.79 % were noted in average vapor surface partial pressure, humidity ratio difference, EF, and COP, respectively. This change in air inlet mode significantly enhanced dehumidification effectiveness to levels comparable to those achieved using a conventional corrosive adiabatic LiCl system. Precooling the inlet air enhanced dehumidification, whereas preheating improved the regeneration of ionic liquids and provided more stable inlet air conditions. The proposed system yielded energy savings of 15 % relative to a typical condensation dehumidification system.

查看原文本刊更多论文

绝热离子液体干燥剂除湿系统中空气预处理和再生的效果

设计了一种进气预冷和预热的绝热液体干燥剂除湿系统。根据进入蓄热器的进风方式，该系统以室外新风模式或室内回风模式运行。在两种模式下，评估了空气质量流量、入口温度、入口湿度比和入口液体干燥剂温度对系统性能的影响。结果表明：进气温度的升高降低了传质效率，但提高了性能系数；增加进口空气湿度比增加了蒸汽压差，从而提高了除湿效率；而液体干燥剂温度的升高则衰减了吸湿能力。室外模式切换到室内模式后，平均汽面分压、湿比差、EF和COP分别增加了6.97%、6.87%、6.87%和8.79%。这种空气进口模式的改变显著提高了除湿效率，达到了与使用传统的腐蚀性绝热LiCl系统相当的水平。预冷进气可增强除湿效果，而预热可改善离子液体的再生并提供更稳定的进气条件。与典型的冷凝除湿系统相比，该系统可节省15%的能源。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

7.20

自引率

10.40%

发文量

327

审稿时长

41 days

期刊介绍： Thermal Science and Engineering Progress (TSEP) publishes original, high-quality research articles that span activities ranging from fundamental scientific research and discussion of the more controversial thermodynamic theories, to developments in thermal engineering that are in many instances examples of the way scientists and engineers are addressing the challenges facing a growing population – smart cities and global warming – maximising thermodynamic efficiencies and minimising all heat losses. It is intended that these will be of current relevance and interest to industry, academia and other practitioners. It is evident that many specialised journals in thermal and, to some extent, in fluid disciplines tend to focus on topics that can be classified as fundamental in nature, or are ‘applied’ and near-market. Thermal Science and Engineering Progress will bridge the gap between these two areas, allowing authors to make an easy choice, should they or a journal editor feel that their papers are ‘out of scope’ when considering other journals. The range of topics covered by Thermal Science and Engineering Progress addresses the rapid rate of development being made in thermal transfer processes as they affect traditional fields, and important growth in the topical research areas of aerospace, thermal biological and medical systems, electronics and nano-technologies, renewable energy systems, food production (including agriculture), and the need to minimise man-made thermal impacts on climate change. Review articles on appropriate topics for TSEP are encouraged, although until TSEP is fully established, these will be limited in number. Before submitting such articles, please contact one of the Editors, or a member of the Editorial Advisory Board with an outline of your proposal and your expertise in the area of your review.