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Experimental investigation of low-pressure refrigerant mixtures for micro cryogenic coolers.

Author(s) : LEWIS R., WANG Y., BRADLEY P. E., et al.

Type of article: Article

Summary

Micro Cryogenic Coolers (MCCs) can achieve very small sizes and high efficiencies when operating with a refrigerant mixture, but micro-scale compressors have a limited pressure output. Four refrigerant mixtures were designed to operate between 0.4 MPa and 0.1 MPa, and tested in a MCC system both with and without pre-cooling. For comparison, two pure refrigerants were tested as well. Without pre-cooling, each mixture exhibited considerably lower cooling power than the design value. With pre-cooling, the mixtures exhibited unsteady cooling temperatures accompanied by flow pulsations after a period of time. The low cooling power, unsteady temperatures, and time required for the pulsations to occur are analyzed in terms of composition change due to liquid hold-up in the annular and intermittent flow regimes.

Details

  • Original title: Experimental investigation of low-pressure refrigerant mixtures for micro cryogenic coolers.
  • Record ID : 30007943
  • Languages: English
  • Source: Cryogenics - vol. 54
  • Publication date: 2013/02
  • DOI: http://dx.doi.org/10.1016/j.cryogenics.2012.12.004

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