The Ar Car McKetta Department of Chemical Engineering 空气化工部车麦克塔.pptVIP

The Air Car Scott McNally Chemical Engineering The University of Texas Fall 2007 Outline The Cars Air Tanks Thermodynamics Does it make sense? Is it even possible? Summary and Conclusion The Engine Compressor efficiency: 80-90% These engines are compressors in reverse MDI: Moteur Developpment International Weight: 750 Kg Max load: 500 Kg Range: 150 miles Top speed: 68 mph Recharge time: 3 minutes Filling the Tanks Costs $2 in electricity Filling stations 3 minutes using volume transfer These stations don’t exist Home compressor 4 hrs in Europe 8 hrs in U.S. Thermodynamics 300 Liters at 300 Bar Full tank weight: 200 Kg 43,600 Btu required for filling 40,000 max output Gasoline: 110,000 Btu/Gal Equivalent: 0.4 gallons of gasoline Thermodynamics Honda Civic Hybrid: 45 mpg, 1100 kg Gas engine: 20% efficient At 100% efficiency: 225 mpg 0.4 gallons: 90 miles Advertised numbers are flawed Tank size needs to be doubled Increase weight by 200 kg Not a big deal Thermal Efficiency High thermal efficiency Power plant: biggest loss at 50% Transmission line loss: 7% Compressor: 10-20% Air engine with regenerative braking: 170% Impossible Overall efficiency: 40% Electrical efficiency: 70% Summary - Benefits Cheap 3,500 euro sticker price A few dollars to fill up and maintain Free Air Conditioning Higher thermal efficiency Summary - Drawbacks Less safe: Fiberglass and glue Low power, tank bleed off Shorter range Infrastructure problem Conclusion Possible Good for city driving Short range forever Not likely to be successful in U.S. References The Air Car. 2007. Moteur Developpment International. 17 Nov. 2007 /. The World’s First Air Car. 2007. Popular Mechanics. 17 Nov. 2007 /automotive/new_cars/42.... Questions? * *