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IIR document

Low temperature phase equilibria of refrigerant mixtures.

Number: pap. n. 008

Author(s) : WINKELMANN D., OELLRICH L. R.

Summary

There is a growing potential for possible areas of application for mixed refrigerant cycles (MRC), i.e. in bio-freezing, in cryo-medicine, in ht-superconductivity or for the liquefaction of gases. The attractiveness of MRCs lies in the possibility to employ commercially available standard refrigerant components also for cryogenic applications. The key to an efficient MRC design is the correct choice of the mixture’s composition. Generally, wide-boiling mixtures are applied with some exhibiting strong non-ideal-behaviour like liquid-liquid-separation. This requires exact knowledge of the phase behaviour of the applied refrigerants in the temperature range of interest. In case of a prerequisite of non-flammability currently the only choice to reach temperatures down to 100 K or below is the combination of fully and partially fluorinated HC with argon, nitrogen and/or neon. At ITTK, a test rig has been built to perform phase equilibrium measurements of binary mixtures in a temperature range from ambient to 100 K and pressures from near 0 to 35 bars. Two measurement principles were applied: A static equilibrium cell to measure boiling points and a cell with vapour circulation (dynamic method) allowing sampling of both, liquid and vapour phase. Thus, the complete set of phase equilibrium data (p-T-x-y-data) is obtained. The setup modifications are described and experimental data as well as models for adequate description of the phase equilibrium data are presented.

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Pages: 126-132

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Details

  • Original title: Low temperature phase equilibria of refrigerant mixtures.
  • Record ID : 30005812
  • Languages: English
  • Subject: HFCs alternatives
  • Source: Cryogenics 2012. Proceedings of the 12th IIR International Conference: Dresden, Germany, September 11-14, 2012.
  • Publication date: 2012/09/11

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