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regenerative energy systems

Urban Transport

London Tube trains recover enough energy to power stations

According to Transport for London (TfL), the city's Underground carries 1.2 billion passengers a year over 402 km (250 mi) of track, with some stations handling 89 million passengers annually. That adds up to a fleet of trains covering 76.2 million km (47 million mi) and an energy bill that defines "enormous." In an effort to make the system greener and cheaper, the authority carried out a five-week trial of a regenerative braking system billed as a "world first" that could slice 5 percent off London Underground's energy bill and save up to £6 million (US$9 million) per year.Read More

Automotive

Test Drive: Tesla Model S

Having been available for just over a year now, Tesla’s Model S has received its fair share of acclaim, and its fair share of criticism. So what’s it like to drive this 416 hp all-electric, and how does it compare to other premium sedans? Gizmag went to Palo Alto to find out first hand. Read More

Automotive

Volkswagen's 214 mpg Twin Up! concept debuts in Tokyo

Earlier this year Volkswagen announced production of its 261 mpg hyper-efficient XL1, but with an estimated $145,000 price tag it’s unlikely the hybrid will become a common fixture on most streets. The company’s Twin Up! hybrid concept, which made its debut at the Tokyo Motor Show yesterday, could however become a more reasonable option for the masses. Read More

Urban Transport

Inline-wheeled Thrustcycle SRT performs a clever balancing act

Fans of three-wheeled cars will tell you that the vehicles come in two configurations: delta, with the single wheel in the front, and tadpole, with the single wheel in the back. Well, now there's another type. The prototype Thrustcycle SRT has all three of its wheels in a straight lateral line, and utilizes a mechanical gyroscopic stabilizing system to keep it firmly upright even when standing still. That same system also stores kinetic energy generated by braking, extending the vehicle's range.Read More

Bicycles

Flywheel Bicycle: KERS for pedal-pushers

In order to help boost their range, many electric and hybrid cars employ regenerative technology where braking energy is stored in the battery instead of simply being wasted. This idea can also be applied to electric-assist bikes, but what about bicycles of the plain old human-powered variety? Isn't it a shame that after having built up some good momentum, you just have to write it all off once you stop? Maxwell von Stein, a student at New York City's Cooper Union for the Advancement of Science and Art, thought so. As his senior project, he recently rigged up a flywheel to an existing bicycle, in order to harness the energy that's lost during braking. That energy can then be used to boost the bike when needed.Read More

Environment

Solar Thermal Waste Heat Engine works at low temperature, low pressure

Technology capable of generating electricity by extracting energy from heat that is otherwise just wasted is a fairly new branch of renewable technology. A typical co-generation plant uses waste heat from a gas or steam turbine for hot water or space heating. This Waste Heat Engine (WHE) developed by Cyclone Power Technologies operates at temperatures as low as 225F (107 C). The engine can generate up to 10kw from heat sources such as industrial ovens or furnaces, concentrating solar thermal collectors, engine exhaust and biomass combustion.Read More

Automotive

MIT students develop Hydraulic Regenerative Shock Absorbers

We reported recently on several new methods of regeneration for hybrid vehicles. These included regenerative shocks based on electric motors and a hydraulic drive train. Now students at MIT have developed a regenerative shock absorber that is a cross between those two. Fitted to a heavy truck, each shock absorber could generate up to an average of 1 Kw on a standard road, completely displacing the large alternator load and even running accessory devices such as hybrid trailer refrigeration units.Read More

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