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Exergy analysis to determine appropriate design and operating parameters for Collins refrigerator-liquefier under mixed mode operation.

Number: pap. n. 047

Author(s) : KUNDU A., THOMAS R. J., GHOSH P., et al.

Summary

Helium plants operate as pure liquefier, pure refrigerator or as mixed-mode system where only a part of the liquid produced is extracted and the other part is vaporized by heat load. Each of these plants needs to be designed differently for achieving the highest cooling effect. In this paper, refrigerator, liquefier and mixed-mode (25/75, 50/50 and 75/25) plants, all having Collins cycle configurations have been simulated on Aspen HYSYS® V7.0 for determining optimum compressor pressure, diversion of compressor flow through expanders and its distribution among the expanders and surface area required for each heat exchanger to achieve the highest possible exergy efficiency. A plant designed for a particular mixed mode operation (including liquefier and refrigerator) may suffer a large loss of efficiency if it is made to operate at off-design conditions. Detailed evaluation of deterioration in exergy efficiency may help one to choose the right mixed mode plant intended for a desired range of operation.

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Pages: 233-239

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Details

  • Original title: Exergy analysis to determine appropriate design and operating parameters for Collins refrigerator-liquefier under mixed mode operation.
  • Record ID : 30006633
  • Languages: English
  • 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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