Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/32223
Title: Investigation on feasibility of ionic liquids used in solar liquid desiccant air conditioning system
Authors: Luo, Y
Shao, S
Qin, F
Tian, C
Yang, H 
Keywords: [Bmim]BF 4
[Dmim]OAc
Dehumidification
Ionic liquid
Liquid desiccant
Solar air conditioning
Issue Date: 2012
Publisher: Elsevier
Source: Solar energy, 2012, v. 86, no. 9, p. 2718-2724 How to cite?
Journal: Solar energy 
Abstract: The corrosion problem of traditional liquid desiccants hinders the development of solar liquid desiccant air conditioning system. Ionic liquids (ILs) could be a possible substitute because of their low corrosion to metals. According to the characteristic of cation and anion, two ILs 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF 4) and 1,3-dimethylimidazolium acetate ([Dmim]OAc) were selected for possibility investigation. The experimental results demonstrated that the surface vapor pressure of [Bmim]BF 4 aqueous solution was so high that it was not suitable for dehumidification. With comparing the structure of [Bmim]BF 4 and 1-ethyl-3-methylimidazolium tetrafluoroborate ([Emim]BF 4), it was found that for imidazole salts with the same anion, as the alkyl chain of the cation becomes shorter, the surface vapor pressure of its aqueous solution would be lower. In addition, simulation model was used to compare the dehumidification performance of [Dmim]OAc and [Emim]BF 4 with that of the traditional desiccants lithium Chloride (LiCl) and lithium bromide (LiBr). The results showed that in the same condition, [Dmim]OAc with an inlet mass concentration of 81.7% and [Emim]BF 4 of 85.5% could reach the same dehumidification rate as LiCl of 40.9% and LiBr of 45.0% mass concentration. Better dehumidification performance of [Dmim]OAc than that of [Emim]BF 4 was achieved, thus, like [Emim]BF 4, [Dmim]OAc can also be a promising substitute for traditional desiccant.
URI: http://hdl.handle.net/10397/32223
ISSN: 0038-092X
EISSN: 1471-1257
DOI: 10.1016/j.solener.2012.06.008
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