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Design of a cascade refrigeration system for applications below -50°C using CO2-sublimation.

Number: pap. 2168

Author(s) : XU Y., LANGEBACH R., HESSE U.

Summary

Within the present paper the design of a CO2-sublimation refrigeration system is introduced. Different variations of CO2 cycles were theoretically investigated and compared to a baseline R-23 system under various boundary conditions. It turned out that the overall system efficiency of a modified CO2-sublimation system could exceed the conventional R-23 cycle performance in many operation points. Based on the simulation results, a cascade design has finally been chosen. The lower stage of the cascade system can be switched between the CO2-sublimation cycle and a conventional R-23 cycle, so that these two cycles can be compared directly under the same ambient conditions. For the CO2 sublimation cycle a two-stage compression with intercooling is used as well as an internal heat exchanger. The design of this cascade refrigeration machine is currently used for building-up a demonstrator to prove the concept experimentally.

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Pages: 11

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Details

  • Original title: Design of a cascade refrigeration system for applications below -50°C using CO2-sublimation.
  • Record ID : 30024433
  • Languages: English
  • Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2018/07/09

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