Dehumidification and thermal regeneration characterization of binary deep eutectic solvents in liquid desiccant air conditioning systems

Oladosu, T.L. and Al-Kayiem, H.H. and Gilani, S.I.U. and Baheta, A.T. (2021) Dehumidification and thermal regeneration characterization of binary deep eutectic solvents in liquid desiccant air conditioning systems. Journal of Building Engineering, 42 .

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The energy-saving propensity of liquid desiccant air dehumidification technique compared with its counterparts, mitigating the limitations of conventional desiccant solutions and the need for energy optimization in indoor space cooling, has invigorated the exploration of alternative desiccant solutions. This study investigates different binary deep eutectic solvents as a potential alternative working fluids in liquid desiccant air conditioning systems. Hydrogen bond acceptors (Choline chloride, N, N-Diethylethanolammonium chloride, 1-Butyl-3-methylimidazolium chloride, ZnCl2) and hydrogen bond donor (Ethylene glycol) were synthesized in different ratios to form binary deep eutectic solvents. The physiochemical, thermophysical and rheological properties of the investigated solutions were characterized and evaluated. DES A1 (mixture of choline chloride and ethylene glycol in ratio 1:2) and DES D1 (1-Butyl-3-methylimidazolium chloride and ethylene glycol in ratio 1:1) were found best among investigated binary DES solutions. The dehumidification and thermal regeneration potential of these promising solutions were further investigated in a humidity chamber and a drying oven, respectively. At 65 relative humidity, 30 °C air temperature, and 3.77 � 10�4 m2 moisture-desiccant contact area, the estimated dehumidification mass flux of DES A1 and DES D1 are 4.61 � 10�2 and 3 � 10�2 g/m2�s, respectively. Empirical correlations obtained for deep eutectic solvents moisture absorption in this study provide an error limit between ±2.6 to ±3.5 . These solutions are found promising as alternative solutions for dehumidification and thermal regeneration. © 2021

Item Type:Article
Impact Factor:cited By 0
Uncontrolled Keywords:Air; Air conditioning; Biocompatibility; Chlorine compounds; Energy conservation; Ethylene; Ethylene glycol; Eutectics; Humidity control; Hydrogen bonds; Liquids; Organic solvents; Polyols; Zinc chloride, 1-Butyl-3-methylimidazolium chloride; Choline chloride; Deep eutectic solvents; Dehumidification; Dehumidification/regeneration; Desiccant air-conditioning systems; Green solvent.; Liquid desiccant; Liquid desiccant air-conditioning; Thermal regeneration, Driers (materials)
ID Code:23676
Deposited By: Ms Sharifah Fahimah Saiyed Yeop
Deposited On:19 Aug 2021 08:20
Last Modified:19 Aug 2021 08:20

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