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Development of CO2 dry ice heat pump system.

Number: 1126

Author(s) : YAMAGUCHI H., KAMIMURA T., HATTORI K., NEKSÅ P., YAMASAKI H.

Summary

A refrigeration temperature below −50.0°C is highly required for the storage of vaccines and fishery catches using natural refrigerants such as CO2 (carbon dioxide). In this study, we have proposed and developed a unique refrigeration system using solid-state CO2 (dry ice) to achieve ultra-low temperatures below −70°C. The initial challenge was the evaporator blockage due to dry ice aggregation, causing system instability. A stainless-steel spiral coil (swirl promoter) was introduced at the evaporator/sublimator inlet to enhance heat transfer and alleviate the blockage problem. The system, which operates effectively at the triple point of approximately −60°C and 0.5 MPa, is further advanced to its limits by using a cyclone separator/evaporator in its latest stage. By integrating a cold recovery heat exchanger in a cylindrical vessel, the system can maintain ultra-low temperatures of approximately −70°C inside the recovery section, achieving a coefficient of performance of this system (COPsystem) of 1.2.

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Pages: 8 p.

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Details

  • Original title: Development of CO2 dry ice heat pump system.
  • Record ID : 30032659
  • Languages: English
  • Source: 16th IIR-Gustav Lorentzen Conference on Natural Refrigerants (GL2024). Proceedings. University of Maryland, College Park, Maryland, USA, August 11-14 2024
  • Publication date: 2024/08
  • DOI: http://dx.doi.org/10.18462/iir.gl2024.1126

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