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Heat Transfer Research
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ISSN Печать: 1064-2285
ISSN Онлайн: 2162-6561

Выпуски:
Том 50, 2019 Том 49, 2018 Том 48, 2017 Том 47, 2016 Том 46, 2015 Том 45, 2014 Том 44, 2013 Том 43, 2012 Том 42, 2011 Том 41, 2010 Том 40, 2009 Том 39, 2008 Том 38, 2007 Том 37, 2006 Том 36, 2005 Том 35, 2004 Том 34, 2003 Том 33, 2002 Том 32, 2001 Том 31, 2000 Том 30, 1999 Том 29, 1998 Том 28, 1997

Heat Transfer Research

DOI: 10.1615/HeatTransRes.2014007549
pages 383-397

EXPERIMENTAL STUDY ON A TWO-STAGE LIQUID DESICCANT DEHUMIDIFICATION SYSTEM USING DUAL DESICCANT SOLUTIONS

Zhenqin Xiong
School of Mechanical Engineering, Shanghai Jiao Tong University
Ruzhu Wang
Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, 800 Dongchuan Road. Minhang District, Shanghai 200240, China
Yanjun Dai
Institute of Refrigeration and Cryogenics, Key Laboratory for Power Machinery and Engineering of M.O.E, Shanghai Jiao Tong University, Shanghai, 200240, China

Краткое описание

A two-stage liquid desiccant dehumidification system using a lithium chloride (LiCl) solution and a calcium chloride (CaCl2) solution respectively in the first- and second-stage dehumidifier was proposed through numerical analysis and exergy analysis in the previous study and it is improved by two methods, i.e., the high concentration variance and predehumidification of CaCl2. To assess its dehumidification performance and the predehumidification effect of the first-stage dehumidifier using CaCl2, an experimental study is carried out with dehumidifiers of the size 300 mm × 250 mm × 300 mm packed with Celdeck material under three typical conditions, i.e., ARI standard outdoor conditions, ARI dry outdoor conditions, and the typical summer outdoor conditions in Shanghai. It is proved that the humidity ratio of air after two-stage dehumidification under the ARI standard outdoor conditions and ARI dry outdoor conditions meets the requirement of the ARI indoor conditions when the LiCl concentration is in the range of 40−35% and the initial concentration of CaCl2 is 40%. It is founded that the predehumidification of a CaCl2 solution is significant. It can handle 20−63% of the total moisture load in the case studied. A parametric analysis has also been made. The results indicate that the humidity ratio after dehumidification is mainly influenced by the air velocity and the desiccant concentration of LiCl solution. The dehumidification performance deteriorates when the desiccant solution flow rate is around 300−400 kg/h due to the poor distribution of desiccant solutions on the packing material. The moisture removed by the CaCl2 solution depends on its concentration and the air velocity.


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