1. NEW TRENDS IN AUTOMOBILE AIR CONDITIONING

2. INTRODUCTION WHAT IS AIR CONDITIONING?  Cooling and dehumidification  Cooling, heating, ventilation or disinfection. WHAT IS AUTOMOBILE AIR CONDITIONING ?  Very common.  Defogging  Active safety factor.

3. WHAT IS REFRIGERANT?  Compound used in a heat cycle.  Chlorofluorocarbons were used.  Presently, R134a is used as refrigerant.

4. AIR CONDITIONING WORKING CYCLE

5. Refrigerant Circuit 1.Compressor 2.Electromagnetic coupler 3.Condenser 4.Accessory fan 5.Refrigerant cartridge with safety device and drying pad 6.Evaporator 7.Evaporator fan, 8.Expansion valve

6. Ventilation Circuit 1.Fresh air valve 2.Internal circulation valve 3.Air mixing chamber 4.Ventilator 5.Air filter 6.Evaporator 7.Heater 8.Windshield defroster outlets valve 9.Central duct valve 10.Leg outlet valve 11.Anterior outlet valve 12. Side outlet valve

7. NEED TO CHANGE….. Very long atmospheric lifetimes Effects -  Global Warming  Ozone Depletion  Infectious Diseases

10. ALTERNATIVE REFRIGERANTS  AMMONIA ( NH 3 )  HYDROGEN ( H 2 ) CARBONDIOXIDE ( CO 2 )

11. ADVANTAGES OF CO 2 OVER R134a  Natural refrigerant.  Non-toxic.  Non-flammable.

12. Analysis of Air Conditioning Systems Operating with CO 2 and R134a

13. ISSUES CONCERNING THE DESIGN  Mechanical impact/temperature.  Direct internal pressure.

14.  Overall comfort.  Revolutionary change. CONCLUSION

16. REFERENCES Joudi KA, Mohammed ASK, Aljanabi MK (2003) “Experimental and computer performance study of an automotive air conditioning system with alternative refrigerants”, Energy Conversion and Management 44(18) pp2959-2976. C P Arora, Refrigeration And Air Conditioning. S.S. Thipse, Publisher: Jaico Publising House. R S Khurmi, Refrigeration And Air conditioning Pettersen J, Hafner A, Skaugen G (1998) “Development of compact heat exchangers for CO2 air-conditioning systems” Int. J. Refrig. 21(3) pp180-193.

17. THIS PRESENTATION IS PRESENTED BY: VIGNESH RAVI IYER Aeronautical Dept. Aero 4c, Hindustan University, Padur, Chennai – 603 103