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The second-law based thermodynamic optimization criteria for pulse tube refrigerators.

Author(s) : RAZANI A., ROBERTS T., FLAKE B.

Summary

The second-law based thermodynamic optimization criteria with application to Stirling and pulse tube cryogenic refrigerators are investigated and compared. New ecological criteria for optimization and characterization of cryogenic refrigerators are proposed and a model based on the exergy flow interpretation of the criteria is developed. It is shown that the conventional ecological criteria used in the analysis and optimization of energy systems is not suited for application to cryogenic refrigerators. The criteria must be modified due to the fact that practical cryogenic refrigerators have high internal irreversibilities. This high internal irreversibility exists despite the fact that the external irreversibility due to heat transfer is quite low in cryogenic refrigerators. It is shown how the proposed ecological criteria simulate the condition where a compromise between exergy delivered and exergetic efficiency in design space is obtained. The optimization criteria is applied to experimental data generated for a high efficiency cooler by assuming a linear load curve for the cooler while appropriate parameter models are chosen to simulate other cooler characteristics. Numerical example for the effect of different parameters including the heat rejection temperature, no load temperature, and other important system parameters are presented. Finally, application of the criteria to thermodynamic optimization of multistage cryocoolers is discussed.

Details

  • Original title: The second-law based thermodynamic optimization criteria for pulse tube refrigerators.
  • Record ID : 2008-1063
  • Languages: English
  • Publication date: 2006/06/14
  • Source: Source: Proc. 14th int. Cryocooler Conf., Annapolis, MD
    285-292; fig.; 9 ref.

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