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A comparison between lithium bromide-water and ionic liquid-water as working solution for absorption refrigeration cycles.

Number: pap. ID: 287

Author(s) : RÖMICH C., MERKEL N., SCHABER K., et al.

Summary

Reliable vapour-liquid-equilibria (VLE) measurements are required for the estimation of the performance of an absorption chiller. Thus the water partial pressure of a mixture of water and a room temperature ionic liquid (RTIL) was measured in two different ways: Via Fourier-transform-infrared (FT-IR) Spectroscopy in a dynamic cell and via Raman-spectroscopy in a static cell. Additional mixture properties as viscosity and specific heat capacity were measured as a function of concentration. An absorption chiller designed for LiBr-water with a nominal cooling capacity of 10 kW was operated with a mixture of diethylmethylammonium methanesulfonate (DEMA MeSO3) and water in order to demonstrate the performance of new working solutions with RTILs. Although the measured coefficient of performance (COP) is comparable to the one of lithium bromide (LiBr)-water, the higher viscosities of working solutions with RTILs cause an insufficient heat and mass transfer which leads to a low refrigeration output.

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Pages: 8 p.

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Details

  • Original title: A comparison between lithium bromide-water and ionic liquid-water as working solution for absorption refrigeration cycles.
  • Record ID : 30002421
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21

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