Experimental evaluation of a semi-open membrane-based absorption heat pump system utilizing ionic liquids

Vapor-Pressure Measurement of Ternary System CaCl2 + [Emim]Br + H2O, CaCl2 + [Emim]Cl + H2O, CaCl2 + [Emim]Ac + H2O, and CaCl2 + [Emim]NO3 + H2O

“…The COP can reach 1.2 when the hot water output of the system is 56 °C. 5 The COP and ESD (energy storage density) of four absorption thermal energy storage systems using H 2 O + IL as a working pair were studied. The [Dmim][DMP] aqueous solution had the highest COP and ESP values in the system.…”

“…Therefore, it is particularly urgent to look for low-corrosive, environmentally friendly, low-crystallization-temperature absorption working pairs. Ionic liquids (ILs) which have been verified as alternative working mediums for absorption systems have the characteristics of low vapor pressure, noncorrosion, and noncrystallization. − The system of an absorption chiller using H 2 O + 1-ethyl-3-methyl­imidazolium di­methyl­phosphate ([Emim] [DMP]) as a working fluid pair was simulated. The coefficient of performance of H 2 O + [Emim] [DMP] is less than that of H 2 O + LiBr but still more than 0.7 .…”

“…A semiopen absorption heating dehumidification cooling system was built in which the IL is used as the absorbent to overcome the corrosion and crystallization. The COP can reach 1.2 when the hot water output of the system is 56 °C . The COP and ESD (energy storage density) of four absorption thermal energy storage systems using H 2 O + IL as a working pair were studied.…”

On the Moisture Absorption Capability of Ionic Liquids

“…To the best of our knowledge, the first reports on the use of ILs as a desiccant source for LDACs were published by Luo et al, who demonstrated the feasibility of the ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate ([C 2 mim]­[BF 4 ]) as a desiccant. , Subsequently, numerous reports − and reviews , on this topic were published. The most extensively investigated were the imidazolium ILs. , Choline ILs were also studied; it was demonstrated that choline (2-hydroxy- N,N,N- trimethylethan-1-aminium) alkylcarboxylates ([Ch]­[RCO 2 ]) can act as efficient desiccants .…”

“…The most extensively investigated were the imidazolium ILs. , Choline ILs were also studied; it was demonstrated that choline (2-hydroxy- N,N,N- trimethylethan-1-aminium) alkylcarboxylates ([Ch]­[RCO 2 ]) can act as efficient desiccants . Nevertheless, the primary focus of many of these studies was not on the development of IL desiccants but on the design of efficient liquid desiccant equipment; some of them did not even report the structure of the ILs employed. − Our own efforts, on the other hand, have been directed toward the design and optimization of ILs as liquid desiccants for LDACs. Our initial investigations of ammonium and phosphonium ILs as well as imidazolium and choline ILs revealed that tributyl­(methyl)­phosphonium dimethyl phosphate ([P 4441 ]­[DMPO 4 ]) and choline dimethyl phosphate ([Ch]­[DMPO 4 ]) are characterized by excellent dehumidification capabilities (DCs).…”