This content is not included in your SAE MOBILUS subscription, or you are not logged in.
CO2 Automotive A/C System Optimum High Pressure Control
ISSN: 0148-7191, e-ISSN: 2688-3627
Published May 10, 2005 by SAE International in United States
Annotation ability available
The heat rejection process of CO2 air conditioning system takes place in the supercritical region, where pressure is independent of temperature. It has been demonstrated that at any particular ambient temperature, the system efficiency varies nonlinearly with the working pressure. The optimum high pressure was thereby tracked and derived in this study, which corresponds to the best system performance.
The system simulation was conducted over typical working pressures. The simulation results suggested that for a specific compressor speed, the gas cooler outlet temperature or the ambient temperature could be used to adjust the high pressure to achieve the maximum COP.
CitationYang, W., Fartaj, A., and Ting, D., "CO2 Automotive A/C System Optimum High Pressure Control," SAE Technical Paper 2005-01-2022, 2005, https://doi.org/10.4271/2005-01-2022.
- Pettersen J. An efficient new automobile air conditioning system based on carbon dioxide vapour compression ASHRAE Transaction 1994 5 3 657 665
- Inokuty H. Graphical method of finding compression pressure of CO 2 refrigerating machine for maximum coefficient of performance 1928 Proc. 5# Int. Congress of Refrigeration Rome 185 192
- Park YC. Yin JM. Bullard CW. Hrnjak PS. Experimental and model analysis of control and operating parameters of transcritical CO 2 mobile A/C system ImechE 1999 163 170
- Kauf F. Determination of the optimum high pressure for transcritical CO 2 refrigeration cycles International Journal of Thermal Science 1999 38 325 330
- Hwang Y. Comprehensive investigation of the Carbon Dioxide refrigeration cycle University of Maryland 1997
- Yahia MB. Mann C. Meurillon P. Optimisation of the A/C system: The gas cooler effect Valeo Climate Control France 1999
- Liao SM. Zhao TS. Jakobsen A. A correlation of optimal heat rejection pressures in transcritical CO 2 cycle Applied Thermal Engineering 2000 20 831 841
- Boewe DE. McEnaney RP. Park YC. Yin JM. Bullard JM. Hrnjal PS. Comparative experimental study of supercritical R134a and transcritical R744 refrigeration systems for mobile applications University of Illinois Urbana-Champaign 2000
- Yang, WW. A simulation study of CO2 automotive A/C system University of Windsor 2004
- McEnaney RP. Park YC. Yin JM. Hrnjak PS. Performance of the prototype of transcritical R-744 mobile A/C system SAE International Congress and Exposition 1999
- Bhatti MS. A critical look at R-744 and R-134a mobile air conditioning systems SAE Technical Paper Series 1997
- Yin JM. Bullard CW. Hrnjak PS. R-744 gas cooler model development and validation International Journal of Refrigeration 2001 24 692 701
- Kim MH. Pettersen J. Bullard CW. Fundamental process and system design issues in CO 2 vapor compression systems Progress in Energy and Combustion Science 2004 30 119 174