{"id":3377,"date":"2011-02-01T01:14:00","date_gmt":"2011-02-01T01:14:00","guid":{"rendered":"http:\/\/68.169.38.31\/?p=3377"},"modified":"2014-04-07T00:29:42","modified_gmt":"2014-04-07T00:29:42","slug":"inefficiency-of-electric-cars","status":"publish","type":"post","link":"https:\/\/gormogons.com\/index.php\/2011\/02\/inefficiency-of-electric-cars\/","title":{"rendered":"The (in)Efficiency of Electric Cars"},"content":{"rendered":"
<\/a><\/div>\n

So our dear readers write in to a screaming Czar<\/a> about mechanical efficiencies<\/a> when they have access to a time traveling robot?!?! Go figure. Well, before I dive into it, I’ll let GorT, Sr.<\/b> chime in:<\/p>\n

I believe [the Czar] has ignored the efficiency of generating the electricity that charges the cars. I can\u2019t believe the 97% – 93% numbers include generating losses, let alone transmission and charging inefficiencies. Just looking at the thermodynamics laws that state that your efficiency (of any heat engine) is a function of the hot side temperature and the low side (sink) temperature measured in absolute degrees. Since even a gas turbine can\u2019t reject heat into absolute zero \u2013 it\u2019s more like 500\u00b0 K or so. The efficiency is the area enclosed by the engine cycle on a temperature-entropy plot if my memory serves me right. Checking the databanks<\/a>, I find 45-50% efficiencies for the most advanced coal plants. If you include a maximum of 50% to generate the electricity, that would collapse the efficiencies of electric vehicles compared to gasoline powered cars.<\/p><\/blockquote>\n

Further research shows that nominal coal and oil-fired plants run about 33% efficient and combined-cycle gas-fired plants can run as high as 50%.<\/p>\n","protected":false},"excerpt":{"rendered":"

So our dear readers write in to a screaming Czar about mechanical efficiencies when they have access to a time traveling robot?!?! Go figure. 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