 If you are planning on attending our second annual tech day next month in Santa Clara, Calif., one of the things you'll hear about is the efforts of OptaMotive, a Silicon Valley startup that built the E.Rex to compete for the Progressive Insurance Automotive X PRIZE. Michael Worry of Nuvation Engineering will talk about his group's work on the E.Rex and the challenges in developing new-generation vehicles that get 100 MPGe. Check it out here. And send your energy efficiency news to us at eeteditor@penton.com. -- Leland Teschler, Editor
 If you eyeballed a block diagram of the heat recovery system devised by Echogen Power Systems, Inc., you wouldn't notice anything special. It looks like a conventional setup that routes water through a heat exchanger in a waste stack, then uses the resulting steam to drive a turbine. What the diagram doesn't show is that the working fluid is CO2. This subtle difference makes it possible for the system to capture as much heat energy as ordinary systems twice or three times its size. READ MORE
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A research team from Colorado State University has devised a lithium-ion battery prototype with features oriented in three dimensions that they say recharges in about 12 minutes compared to the two hours that conventional Li-ion batteries need. The 3D prototype is about the size of a cell phone battery. It also can be discharged over twice as many times as a conventional lithium ion battery at high discharge rates, researchers say. READ MORE
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News reports of a garage fire in Connecticut have EV skeptics out in force. The fire was at the home of EV hobbyist Storm Connors, owner of a GM Volt and a 1987 Suzuki Samurai which he converted to run on electricity. According to newspaper reports, Connors and his wife awoke at about 4 AM to find their garage on fire. Inside the garage, both the Volt and the Suzuki were on charge. The cause of the blaze is still under investigation. READ MORE
 Most energy harvesting (EH) schemes that try to get energy out of vibrations on a micro scale start with some kind of cantilever contraption that generates electrical energy when it bends. But researchers from the University of Notre Dame and Seoul National University took a different approach. They simply laminated a thin piezoelectric patch onto a vibrating structure to generate power up to 3.7 mW, enough for operating wireless sensor units. READ MORE
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