Liquid desiccant air-conditioning system is an energy-efficient choice for heat and moisture independent treatment in buildings, especially for the large dehumidification load. Electrodialysis regeneration is a novel and reliable regeneration method for liquid desiccants, which is suitable for hot and humid climates. In this paper, the performance of the electrodialysis regenerator for regenerating lithium chloride and lithium bromide solutions was studied experimentally, and the current efficiency of the electrodialysis regenerator for regenerating these two solutions was compared. Through analysis, the solute molecular weight was coupled into the current efficiency model, and a new current efficiency model of electrodialysis regenerator for regenerating these two solutions was established, which considers the solute molecular weight of liquid desiccant and can be extended to more liquid desiccants in the future. Furthermore, the performance of the liquid desiccant air-conditioning system using electrodialysis regeneration with these two solutions is compared based on this model. The results show that when lithium chloride solution is applied as liquid desiccant, the system performance coefficient (COP, ratio of cooling capacity to energy consumption) is between 1.16 and 4.49, while the performance coefficient of the system is between 2 and 8.3 when the system uses lithium bromide solution.
QiRHDongCSZhangLZ. A review of liquid desiccant air dehumidification: from system to material manipulations. Energy Build2020; 215: 109897.
2.
IsaacMvan VuurenDP. Modeling global residential sector energy demand for heating and air conditioning in the context of climate change. Energy Policy2009; 37: 507–521.
3.
VakiloroayaVSamaliBPishghadamK. Investigation of energy-efficient strategy for direct expansion air-cooled air conditioning systems. Appl Therm Eng2014; 66: 84–93.
Mujahid RafiqueMGandhidasanPBahaidarahHMS. Liquid desiccant materials and dehumidifiers – A review. Renewable Sustainable Energy Rev2016; 56: 179–195.
6.
ZhangLZZhangN. A heat pump driven and hollow fiber membrane-based liquid desiccant air dehumidification system: modeling and experimental validation. Energy2014; 65: 441–451.
7.
LiangJDHuangBHChiangYC,et al.Experimental investigation of a liquid desiccant dehumidification system integrated with shallow geothermal energy. Energy2020; 191: 116452.
8.
LiXZhangXChenQ. Research on mass transfer and actual performance of the membrane regeneration air-conditioning system. Energy Convers Manage2015a; 106: 84–92.
9.
LiXWZhangXSWangH,et al.Capacitive deionization regeneration as a possible improvement of membrane regeneration method for absorption air-conditioning system. Appl Energy2016; 171: 405–414.
10.
LiSJeongJ. Energy performance of liquid desiccant and evaporative cooling-assisted 100% outdoor Air systems under Various climatic conditions. Energies2018; 11: 1377.
11.
ChengQZhangXSJiaoS. Influence of concentration difference between dilute cells and regenerate cells on the performance of electrodialysis regenerator. Energy2017b; 140: 646–655.
12.
YangZJWangXFYinDS,et al.A non-matching finite element-scaled boundary finite element coupled method for linear elastic crack propagation modelling. Comput Struct2015; 153: 126–136.
13.
WilliamGEMohamedMHFatouhM. Desiccant system for water production from humid air using solar energy. Energy2015; 90: 1707–1720.
14.
ChenYYangHLuoY. Investigation on solar assisted liquid desiccant dehumidifier and evaporative cooling system for fresh air treatment. Energy2018; 143: 114–127.
15.
KabeelAEKhalilAElsayedSS,et al.Theoretical investigation on energy storage characteristics of a solar liquid desiccant air conditioning system in Egypt. Energy2018; 158: 164–180.
16.
ZhanCYinYGuoX,et al.Investigation on drying performance and alternative analysis of different liquid desiccants in compressed air drying system. Energy2018; 165: 1–9.
17.
MishaSMatSRuslanMH,et al.Review of solid/liquid desiccant in the drying applications and its regeneration methods. Renewable Sustainable Energy Rev2012; 16: 4686–4707.
18.
FuHLiuX. Review of the impact of liquid desiccant dehumidification on indoor air quality. Build Environ2017; 116: 158–172.
19.
Al-SulaimanFAGandhidasanPZubairSM. Liquid desiccant based two-stage evaporative cooling system using reverse osmosis (RO) process for regeneration. Appl Therm Eng2007; 27: 2449–2454.
20.
ZhaoPYaoBMengJ,et al.Studies on the fouling behavior and cleaning method of pervaporation desalination membranes for reclamation of reverse osmosis concentrated water. Sep Purif Technol2021; 274: 119034.
21.
LiXWZhangXS. Photovoltaic–electrodialysis regeneration method for liquid desiccant cooling system. Sol Energy2009; 83: 2195–2204.
22.
LiXZhangX. Membrane air-conditioning system driven by renewable energy. Energy Convers Manage2012; 53: 189–195.
23.
GuoYMaZAl-JubainawiA,et al.Using electrodialysis for regeneration of aqueous lithium chloride solution in liquid desiccant air conditioning systems. Energy Build2016; 116: 285–295.
24.
ChengQZhangXJiaoS. Experimental comparative research on electrodialysis regeneration for liquid desiccant with different concentrations in liquid desiccant air-conditioning system. Energy Build2017a; 155: 475–483.
25.
Al-JubainawiAMaZGuoY,et al.Factors governing mass transfer during membrane electrodialysis regeneration of LiCl solution for liquid desiccant dehumidification systems. Sustainable Cities and Society2017; 28: 30–41.
26.
ChengQXuW. Performance analysis of a novel multi-function liquid desiccant regeneration system for liquid desiccant air-conditioning system. Energy2017; 140: 240–252.
27.
ChengQZhangXLiX. Double-stage photovoltaic/thermal ED regeneration for liquid desiccant cooling system. Energy Build2012; 51: 64–72.
28.
ChengQXuYZhangX. Experimental investigation of an electrodialysis regenerator for liquid desiccant. Energy Build2013; 67: 419–425.
29.
WangHChengQFengW,et al.Experimental and theoretical research on the electrical conductivity of a liquid desiccant for the liquid desiccant air-conditioning system: liCl aqueous solution. Int J Refrig2018; 91: 189–198.
30.
PeiWChengQJiaoS,et al.Performance evaluation of the electrodialysis regenerator for the lithium bromide solution with high concentration in the liquid desiccant air-conditioning system. Energy2019; 187: 115928.
31.
ChengQPeiW. Performance comparison on different liquid desiccants in the liquid desiccant air-conditioning using electrodialysis regeneration: liCl and LiBr aqueous solutions. Int J Refrig2018; 107: 1–10.
32.
KarimiLGhassemiAZamani SabziH. Quantitative studies of electrodialysis performance. Desalination2018; 445: 159–169.
33.
CondeMRProperties of aqueous solutions of lithium and calcium chlorides: formulations for use in air conditioning equipment design. Int J Therm Sci2004; 43: 367–382.
34.
PátekJKlomfarJ. A computationally effective formulation of the thermodynamic properties of LiBr–H2O solutions from 273 to 500 K over full composition range. Int J Refrig2006; 29: 566–578.
