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Second law based modelling to optimum design of high capacity pulse tube refrigerators.

Author(s) : JAFARIAN A., SAIDI M. H., HANNANI S. K.

Type of article: Article, IJR article

Summary

The optimum design of a high capacity double inlet pulse tube refrigerator based on second law of thermodynamics has been presented in this paper. Second law is applied to calculate the work loss in the regenerator and to optimize the cryocooler performance. To investigate the behaviour of the pulse tube refrigerator, mass and energy balance equations are applied to several control volumes of the cryocooler cycle. A complete system of conservation equations is employed to solve the regenerator analytically. The proposed model reports the cooling capacity of 110 W at 80 K cold end temperature at frequency of 50 Hz, orifice conductance of 0.4 and double inlet coefficient of 0.6, with 2.4 kW net power delivered to the gas. In this case, the entropy generation in the gas phase is dominant which is contributing more than 85% of the total lost work in the regenerator. The optimum thermal efficiency of 99.1% was achieved at a proper mesh number. However, the second law efficiency is reported to have an inverse behaviour at this mesh number.

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Pages: 58-69

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Details

  • Original title: Second law based modelling to optimum design of high capacity pulse tube refrigerators.
  • Record ID : 2009-0001
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 32 - n. 1
  • Publication date: 2009/01

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