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, email@example.com.
Researchers working with additive manufacturing have said multimaterial techniques will allow industry “to fabricate materials with combinations of density, strength, and thermal expansion that do not exist [yet].”
The term "multiphysics" is used to describe the simulation of multiple types of physics and their influence on one another -- for example, the investigation of the behavior of a chemical in liquid form will involve both chemistry and fluid dynamics.
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