Over the years, many researchers have sought to convert heat to electricity directly, without benefit of turbine or generator. Now, professor Peter Hagelstein of MIT's Department of Electrical Engineering and Computer Science, working with Yan Kucherov of ENECO Inc., reports a device based on semiconductor technology that achieves this goal. Their approach builds on earlier thermionic "vacuum gap" design where electrons boil off a cathode, traverse the gap, and are absorbed into a colder anode, to convert heat to electricity. However, operating temperatures greater than 1,000C limited the usefulness of such scenarios. The new strategy improves performance by replacing the traditional vacuum gap with a multi-layer semiconductor structure. These solid-state conversion devices operate between 200 and 450C–typical temperatures for waste heat recovery. Hagelstein suggests that captured heat lost through automobile engine exhaust might be converted into electricity. The researchers' work has been sponsored by ENECO and DARPA. Patents have been applied for in the U.S. and Europe. For more information, contact Elizabeth Thomson at the MIT News Office, firstname.lastname@example.org.
These free camps are designed for children ages 10 to 18. Attendees are introduced to 3D CAD software and shown how 3D printers can make their work a reality. Here we check out the stops in California and Utah.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.