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Optimization of the composition of a gas mixture in a Joule-Thomson cycle.

Author(s) : KEPPLER F., NELLIS G., KLEIN S. A.

Type of article: Article

Summary

Mixed gas working fluid can be used within Joule-Thomson devices to achieve a greater refrigeration effect than is possible with a pure substance. Lower temperatures and higher cooling powers can be obtained with appropriate mixtures, resulting in lower operating pressures and mass flow rates. This paper describes a computational tool that allows the composition of gas mixtures to be optimized for a particular operating condition. Automated optimization algorithms are described, evaluated, and validated for two- and three-component mixtures consisting of nitrogen and various hydrocarbons. A genetic optimization algorithm was found to be the most robust and reliable technique and was adapted to this application. Subsequently, the optimization space was extended to a larger number of components for a range of load temperatures and operating pressures. The performance of optimized hydrocarbon gas mixtures is compared with that of nonflammable hydrofluorocarbon mixtures for a range of load temperatures and supply pressures.

Details

  • Original title: Optimization of the composition of a gas mixture in a Joule-Thomson cycle.
  • Record ID : 2004-2822
  • Languages: English
  • Source: HVAC&R Research - vol. 10 - n. 2
  • Publication date: 2004/04
  • Document available for consultation in the library of the IIR headquarters only.

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