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Theoretical analysis of the operating and shutdown pressures of a transcritical carbon dioxide air conditioning system.

Author(s) : LI D., GROLL E. A.

Summary

A theoretical analysis of the sensitivity of the system charge on the operating and shutdown pressures of a transcritical CO2 air-conditioning system was performed. The sensitivity of the system charge on shipping pressures was also evaluated. The unit to be considered is an air-to-air air conditioning system with a cooling capacity of 10.3 kW. The nominal charge is based on low and high side normal operating pressures of 40 and 110 bars, respectively, at standard DOE A operating conditions. The refrigeration unit is self contained, such as the US Army ECU (Environmental Control Unit). The operating and shutdown pressures were determined assuming a 5, 10 and 20% overcharge. The operating pressures were determined at standard DOE A operating conditions. The shutdown pressures were determined at 26.7 and 43.3 °C ambient temperatures. To evaluate the sensitivity of system charge on shipping pressures of the same unit with the nominal charge of CO2, the internal shutdown pressure was determined in a 70 °C boxcar environment.

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Pages: 2005-3

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Details

  • Original title: Theoretical analysis of the operating and shutdown pressures of a transcritical carbon dioxide air conditioning system.
  • Record ID : 2006-0614
  • Languages: English
  • Source: Commercial Refrigeration. Thermophysical Properties and Transfer Processes of Refrigerants. Proceedings of the IIR International Conferences.
  • Publication date: 2005/08/02

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