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Modelling and optimization of a cascaded mixed gas Joule-Thom son cryoprobe system.

Author(s) : SKYE H., NELLIS G., KLEIN S.

Summary

Cryosurgery is a technique for destroying undesirable tissue such as cancers using a freezing process. A thermodynamic modelling tool was developed for a two stage, mixed gas Joule-Thomson (MGJT) cryoprobe used for cryosurgery. A conventional vapour compression cycle using a pure refrigerant precools the MGJT cycle that provides refrigeration at the cryoprobe tip. The model is used with an optimization routine to investigate the optimal mixture composition for different cryoprobe tip temperatures as well as optimal precooling temperatures. The cryoprobe system performance is reported in terms of cryoprobe size, and compressor size and power consumption. The results for the two stage system are compared with the performance of a single stage MGJT cycle to demonstrate the benefits and limitations associated with the addition of the precooling cycle.

Details

  • Original title: Modelling and optimization of a cascaded mixed gas Joule-Thom son cryoprobe system.
  • Record ID : 2010-0281
  • Languages: English
  • Source: 2009 ASHRAE Annual Conference CD. Transactions papers presented at the 2009 ASHRAE Annual Conference: Louisville, KY, June 2009. Volume 115, part 2.
  • Publication date: 2009/06/21

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