Ionic liquid based absorption chillers for usage of low grade waste heat in industry

Titelangaben

Preißinger, Markus ; Pöllinger, Simon ; Brüggemann, Dieter:
Ionic liquid based absorption chillers for usage of low grade waste heat in industry.
In: International Journal of Energy Research. Bd. 37 (2013) Heft 11 . - S. 1382-1388.
ISSN 1099-114X
DOI: https://doi.org/10.1002/er.2997

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Abstract

The standard working pairs for absorption chillers, ammonia/water and water/lithium bromide show problematic behaviours like crystallisation and corrosiveness. Because of their convenient solving properties and their low vapour pressure, ionic liquids are a new promising class of sorbents for absorption cooling purposes. In this study, the working pairs water/1,3-dimethylimidazolium dimethylphosphate ([MMIM][DMP]) and water/1-ethyl-3-methylimidazolium dimethylphosphate ([EMIM][DMP]) are implemented in AspenPlus. The performance of a single effect cycle with these pairs is simulated and compared to results of a cycle with water/LiBr. For [EMIM][DMP] a coefficient of performance (COP) comparable to that of LiBr or even higher (up to 0.85) is found. [MMIM][DMP] shows a smaller maximum COP but a largely wider operating temperature range than LiBr. Results are compared with those of other groups, discrepancies discussed and improvements suggested.