Title :
Carbon dioxide as an alternative refrigerant for automotive air conditioning systems
Author_Institution :
HVAC Syst., Zexel USA Corp., Grand Prairie, TX, USA
Abstract :
Thermodynamic performance of a typical automotive air conditioning system has been simulated using carbon dioxide as the working fluid. The performance of the carbon dioxide system is compared with a base case with R-134a as the refrigerant. A cooling capacity of 5.3 kW (1.5 ton) is used for this study. For the base case, evaporation and condensing temperatures of 6.7°C (20°F) and 48.9°C (120°F) are used in the investigation. For the carbon dioxide system, an evaporation temperature of 6.7°C (20°F) and a high side pressure of 130 bars (1856.5 psia) is used. The study shows that the thermodynamic performance of the vapor compression air conditioning system with carbon dioxide as the working fluid is lower than the current R-134a systems. One major disadvantage for carbon dioxide system is extremely high operating pressures. Finally, practical design considerations and safety issues have been presented for the design of air conditioning systems with carbon dioxide as the working fluid
Keywords :
air conditioning; automotive electronics; carbon compounds; condensation; evaporation; refrigeration; safety; thermal analysis; thermodynamics; 1.5 ton; 120 F; 130 bar; 1856.5 psi; 20 F; 48.9 C; 5.3 kW; 6.7 C; CO2; CO2 refrigerant; automotive air conditioning systems; condensing temperature; cooling capacity; design considerations; evaporation temperature; operating pressure; safety issues; thermodynamic performance; vapor compression air conditioning; working fluid; Air conditioning; Air safety; Automotive engineering; Carbon dioxide; Global warming; Heat transfer; Hydrocarbons; Refrigerants; Temperature; Thermodynamics;
Conference_Titel :
Energy Conversion Engineering Conference and Exhibit, 2000. (IECEC) 35th Intersociety
Conference_Location :
Las Vegas, NV
Print_ISBN :
1-56347-375-5
DOI :
10.1109/IECEC.2000.870712
