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Integration of a thermoelectric subcooler into a carbon dioxide transcritical vapour compression cycle refrigeration system.

Author(s) : SCHOENFELD J., MUEHLBAUER J., HWANG Y., et al.

Summary

Thermoelectric (TE) modules have been integrated into a subcooler of an experimental CO2 transcritical vapour compression cycle test system. The TE subcooler was designed and fabricated to subcool CO2 exiting the gas cooler to a temperature below ambient. The heat from the TE subcooler was rejected to the ambient utilizing a separate thermosiphon refrigerant loop with a separate condenser. The thermoelectric modules operate at efficiencies greater than the baseline system, increasing capacity and the overall COP of the entire system. Additionally, subcooling of the CO2 before the expansion device leads to a reduced optimum gas cooling pressure, resulting in greater COP improvement that cannot be achieved in conventional refrigerant vapour compression systems utilizing a TE subcooler. The use of a simple aluminium microchannel TE subcooler was shown to increase the COP of the system by 5% and increase the capacity by 15%.

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Details

  • Original title: Integration of a thermoelectric subcooler into a carbon dioxide transcritical vapour compression cycle refrigeration system.
  • Record ID : 2009-1641
  • Languages: English
  • Source: 2008 Purdue Conferences. 19th International Compressor Engineering Conference at Purdue & 12th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2008/07/14

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