Abstract

Imidazolium ionic liquids with [Tf2N]- anions were synthesized and characterized using nuclear magnetic resonance (NMR) spectrometer, differential thermal analysis (DTA) and differential scanning calorimeter (DSC). Properties of these ILs such as thermal stabilities, heat capacities and thermodynamic properties were measured. Feasibility of these ILs as liquid thermal storage and heat transfer fluids was investigated. It is found that [C4min][Tf2N] has several advantages over other ILs such as wider liquidus temperature range, lower viscosity, higher chemical stability, moderate heat capacity and storage density. The calculated storage densities for [C4min][Tf2N] was more than 180 MJ/m3 when the inlet and outlet field temperature are 210{degree sign}C and 310oC. Based on our experimental results, it can be concluded that ionic liquids are suitable as liquid thermal storage and heat transfer fluids in solar power generation applications.

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