07 Oct '11, 3pm

An Escalator That Feeds the Grid

Regenerative braking , which involves taking unwanted mechanical energy and turning it back into electricity instead of letting it dissipate as heat, is well established in cars like the Toyota Prius and has lately made inroads in railway locomotives . Otis In both cases, an electric motor, which converts current into mechanical energy, briefly reverses its function to become a generator, converting mechanical energy into current. One problem for cars is that the flow of electricity is so great that batteries have trouble absorbing it. For the last decade or so, companies have been using regenerative braking in elevators. Elevators normally use counterweights that are equal to the mass of a half-empty elevator car. If the car is going up with only one person in it, or coming down full, there is gravity to fight with and brakes have to be used. Otis, the largest elevator ma...

Full article: http://green.blogs.nytimes.com/2011/10/07/an-escalator-th...

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An Escalator That Feeds the Building

green.blogs.nytimes.com 07 Oct '11, 3pm

Regenerative braking , which involves taking unwanted mechanical energy and turning it back into electricity instead of le...

Green Blog: An Escalator That Feeds the Buildin...

green.blogs.nytimes.com 07 Oct '11, 3pm

Regenerative braking , which involves taking unwanted mechanical energy and turning it back into electricity instead of le...

River Thames Bridge Goes Solar

River Thames Bridge Goes Solar

solarfeeds.com 08 Oct '11, 1am

A Victorian-era bridge in England is getting a new look – with over 4,400 solar PV panels. The bridge, built in 1886, cros...