EES 0836 Lecture Notes - Lecture 18: Kilowatt Hour, Charge-Depleting, Plug-In Hybrid
3 Apr 2016
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Lecture - 18: but in terms of fossil fuel use, if getting electricity from 35% efficient power plant, and charging battery at 70% efficiency: Right back where we started: unclear if co2 advantage: local electricity source mix matters, electricity source profile by zip code: For 92093: co2 example: c-max energi (phev) in ca, 34 kwh/100 mi in ev mode; 43 mpg in gas/hybrid mode, ev mode co2 emissions. In ca, 659 lbs/mwh converts to 0. 3 kg per kwh. So 100 ev miles (cid:1) 0. 3 34 = 10 kg of co2. But national average electricity mix (cid:1) 19 kg co2: gas/hybrid mode co2 emissions. 100 miles takes 2. 3 gal = 6. 4 kg of gasoline. 3:1 rule makes this ~20 kg of co2. So 2 worse co2 to drive same car on gasoline in ca. Closer to 3 worse when factoring refinery contrib. to gas.
