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Refrigerating concept for small supermarkets using multiple modular cascade systems with carbon dioxide and propylene.

Author(s) : HEERUP C.

Summary

The concept addresses the safety issues involved with hydrocarbons by minimizing the refrigerant charge and containing the hydrocarbon filled parts in a module comprising a closed cabinet. The refrigeration capacity can be satisfied by installing from 3 to 10 modules in parallel. If one module fails, the remaining will in most cases suffice as back up capacity until replacement. The modules contain each a refrigerant charge of maximum one kilogram propylene serving as the upper stage of a cascade system. The condensers for the upper stages are cooled by a conventional dry cooler circuit. The upper stage is cooling the primary side of a plate heat exchanger, the secondary side acting as condenser for carbon dioxide as the secondary refrigerant. The liquid carbon dioxide is pumped to the low temperature display cabinets via expansion valves and is returned to the condenser by multiple rolling piston compressors, thus completing the low stage of the cascade system. The medium temperature display cabinets are simply pump fed via solenoid valves with liquid carbon dioxide which partly or totally evaporates and then returns to the condenser.

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Pages: 2004-2

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Details

  • Original title: Refrigerating concept for small supermarkets using multiple modular cascade systems with carbon dioxide and propylene.
  • Record ID : 2005-1900
  • Languages: English
  • Source: Natural Working Fluids 2004: 6th IIR-Gustav Lorentzen Conference
  • Publication date: 2004/08/01

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