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Discharge pressure optimization for CO2 transcritical cycle using a capillary tube.

Author(s) : ZIMMERMANN A. J. P., MACIEL R. A.

Summary

This work is focused on the evaluation of the performance of a single-stage CO2 reciprocating compressor working on a beverage cooler application. A glass door merchandiser was tested to develop a procedure to determine the best combination of THE capillary tube and refrigerant charge. Fin and tube heat exchangers were used both for the evaporator and the gas cooler. The criteria to choose the combination was the total energy consumption of the system. The theoretical optimum discharge pressure was determined point by point during the "ON" period of the cycle and was compared to the experimental discharge pressure. The results showed that the closer profile to the optimum profile was the best in terms of energy consumption. The system was also tested with R134a and the results were compared showing 26% of energy savings in favour of the CO2 system.

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Details

  • Original title: Discharge pressure optimization for CO2 transcritical cycle using a capillary tube.
  • Record ID : 2007-1500
  • Languages: English
  • Source: 2006 Purdue Conferences. 18th International Compressor Engineering Conference at Purdue & 11th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2006/07/17

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