Revolving door generates power for café
Nature cafe La Porte said patrons using the revolving door can look at a meter telling them how much electricity their entrance generated for the establishment, Expatica reported.
Workers said one person entering the store through the revolving door creates about enough electricity to prepare a single cup of coffee.
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Working with Stanford University engineers Wei Li and Shanhui Fan, University of California Los Angeles materials scientist Aaswath Raman put together a device that produces a voltage by channelling the day's residual warmth into cooling air.
"Our work highlights the many remaining opportunities for energy by taking advantage of the cold…
