Posts belonging to Category green power



Train Of The Future

Hyperloop Transportation Technologies says it’s about to break ground on a full scale test track for it’s revolutionary future travel means, the Hyperloop, which will take passengers through steel tubes at speeds potentially up to 760mph (1223 km/h). For those that dream of the future, even this might have seemed a long way off.

hyperloop

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Imagine a capsule filled with people that’s hovering inside the tube. Inside the tube you create a low pressure environment very similar to an airplane that’s at high altitudes. So now the capsule travelling inside the tubes doesn’t encounter as much resistance, and so therefore can travel really fast with very little energy“, says Hyperloop Transportation Technologies CEO, Dirk Ahlborn.

No accidents, environmentally friendly and tickets that cost next to nothing: This was once an idea drawn out by billionaire entrepreneur Elon Musk, but it’s Dirk Ahlborn that’s also trying to make it a reality. Musk’s SpaceX are planning a track and asking others to design the pods that will carry passengers. But Ahlborn and his company Hyperloop Transportation Technologies (HTT) are about to build their own in California.  HTT are about to break ground on the test track next year in Quay Valley. But that, he says, is just the beginning: “So do we need a ticket? Are there other ways of creating revenue? The pylons are just out of concrete – so you can have concrete that cleans the air, you can have gardens in them, you could have bee hives inside those concrete pylons, different energy solutions, so there’s lots of things that we can do to create a new cutting edge technology.”

It’s not just the technology that Ahlborn is pioneering either. He and his team of around 360 people at HTT have been able to push forward so quickly by crowdsourcing talent and labour. That means they could be carrying passengers in just a couple of years. “Quay Valley going to be full scale, we’re going to move around 10 million people a year, it’s going to be opening up in 2018,” says Ahlborn.

That could mean tucking into your starter in Vienna and polishing off your dessert in London. A once distant dream that now looks closer than ever to reality.

Source: http://hyperlooptech.com/

Electric Car: Nanogenerator Harvests Power From Rolling Tires

A group of University of Wisconsin-Madison engineers and a collaborator from China have developed a nanogenerator that harvests energy from a car’s rolling tire friction.

An innovative method of reusing energy, the nanogenerator ultimately could provide automobile manufacturers a new way to squeeze greater efficiency out of their vehicles. Xudong Wang, the Harvey D. Spangler fellow and an associate professor of materials science and engineering at UW-Madison, and his PhD student Yanchao Mao have been working on this device for about a year.

The nanogenerator relies on the triboelectric effect to harness energy from the changing electric potential between the pavement and a vehicle’s wheels. The triboelectric effect is the electric charge that results from the contact or rubbing together of two dissimilar objects.

Wang says the nanogenerator provides an excellent way to take advantage of energy that is usually lost due to friction.

Tesla-Model-S

The friction between the tire and the ground consumes about 10 percent of a vehicle’s fuel,” he says. “That energy is wasted. So if we can convert that energy, it could give us very good improvement in fuel efficiency.”

The researchers reported their development, which is the first of its kind, in a paper published May 6, 2015, in the journal Nano Energy.

Source: http://www.news.wisc.edu/

Hydrogen Batteries Power Airliners Galley

Fuel cells hidden inside trolleys used to serve passengers their in-flight drinks could generate enough additional energy to power an airliner’s entire galley, according to German researchers. Passengers on airliners are used to their in-flight snacks coming from the flight attendant’s trolley. In the future, that trolley could provide enough power to cook a plane-load of meals. German researchers have been showcasing their portable fuel cell at the Paris Air show.

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What you see here is an energy generation system with a tank, a reformer, a fuel cell and a battery. The fuel cell hybrid system produces enough power for one galley and if I put it in, you can see the galley is now powered by the trolley,” said  Ronny Knepple, head of energy systems at developer Diehl Aerospace. Diehl‘s humble-looking trolley houses a tank filled with liquid propylene glycol which provides the hydrogen – the fuel source for the battery.

“The propylene glycol from the tank is evaporated and here in the reformer at high temperature the hydrogen is extracted from the propylene glycol,” explains Professor Gunther Kolb from Fraunhofer Institute for Chemical Technology (Germany)  and one of the power unit’s designers.
A catalytic converter in the trolley transforms the toxic by-products of the reaction into carbon dioxide and water. And the compact unit is lighter and smaller than conventional energy systems.
We have used here our special plate heat exchanger technology, which allows us to reduce weight and especially the size of the system considerably. In some cases here, we could save 90 percent of the space required by conventional technology,” adds Prof. Kolb. Planes in service for decades are often refurbished with power-hungry new technology in their galleys. Diehl and its collaborators hope their system will provide an independent power source for increased energy demands. The prototype lighting up the galley in Paris could be seen on airliners within 2 years.

Source: http://www.diehl.com/

Wind Turbines Generate Electricity Without Rotating

A suspension bridge in the United States stretching – and collapsing – in high winds in 1940… …inspires a silent, swaying new-look wind turbine in Spain today. The bladeless turbine generates power from a single conewobbling‘ in the wind. It’s just like an opera singer hitting the high notes and shattering glass, says the developer.

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We have all seen how a soprano who sings at a glass, by matching the tone of the voice to the glass, can breaking it. This type of resonance is a great way to transmit energy. What we do is, instead of using sound waves, is use the swirls, the vortices that are generated by a structure with wind“, says David Yanez, who co-founded the Spanish start-up, Vortex Bladeless.
The six-metre windmill, made from fibreglass and carbon fibre, uses those wind vortices to create patterns of movement that can be converted into energy. The magnets at the base of the cone-shaped blade allow its movements to adjust according to the wind speed.

What we have is a mast, which is the top piece, and acts as a blade, it’s constructed from the same material as a conventional generator, and what it does is oscillate transmitting its oscillation to a conventional alternator which by its own oscillation converts the wind’s energy into electric energy.” Vortex says its turbine will cost around 40 percent less than conventional three-bladed windmills, with a smaller carbon footprint and much lower maintenance costs. And it’s much safer for passing birds. Encouraged by the results so far, Vortex is testing a smaller prototype for domestic use in developing countries.
What we are trying to do now is develop a very small energy distribution sample that is less than three metres high and can be set up on the rooftops of homes“, adds David Yanez.

Vortex‘s new turbine could prove a boost for renewable energy after Spain’s financial crisis hit the industry hard. With investment, the start-up hopes generating energy from wind will be a breeze.
Source: https://www.indiegogo.com/
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https://www.youtube.com/

How To Boost Battery Performance

Stanford University scientists have created a new carbon material that significantly boosts the performance of energy-storage technologies.
designer-carbon-300x200
A new ”designer carbon” invented by Stanford scientists significantly improved the power-delivery rate of this supercapacitor

We have developed a ‘designer carbon’ that is both versatile and controllable,” said Zhenan Bao, the senior author of the study and a professor of chemical engineering at Stanford. “Our study shows that this material has exceptional energy-storage capacity, enabling unprecedented performance in lithium-sulfur batteries and supercapacitors.”

According to Bao, the new designer carbon represents a dramatic improvement over conventional activated carbon, an inexpensive material widely used in products ranging from water filters and air deodorizers to energy-storage devices.

A lot of cheap activated carbon is made from coconut shells,” Bao said. “To activate the carbon, manufacturers burn the coconut at high temperatures and then chemically treat it.

The findings are featured on the cover of the journal ACS Central Science.

Source: http://news.stanford.edu/

Barcelona, The Sun And Wind City

Barcelona‘s beach is being lit up with new-look street lights. The six innovative lamp posts are each fitted with two solar panels, a wind turbine and a battery. As a result, the environmentally-friendly lights generate enough energy to run for ten hours overnight. The new product has been designed by the company Eolgreen with the collaboration of a research team from the Universitat Politecnica de Catalunya (UPC).

Eolgreen

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Compared to a traditional street lighting system, these six street lights that we have set up emit two tonnes less CO2 per year than sodium vapour or mercury vapour bulbs we see in conventional systems,” says Pedro Montes leads research at developers Eolgreen. The company also says its lights are 20 percent cheaper to run than conventional lights because they use LED technology and are independent from the electricity grid. While solar-powered LED street lighting is used elsewhere, Eolgreen‘s system is unique because its graphene turbines turn with even a gentle breeze.

Ramon Bargallo, researcher at the UPC, who helped  design the independently-powered lights adds:  “It was a big challenge as generators often need high speed winds to turn, between 1500 rpm and 3000 rpm. But we needed a generator able to work with only four or five rpm. Also generators are normally more efficient the higher the wind speed and less efficient at low wind speeds, so we had to design it in the opposite way.” Barcelona’s planners aim to roll out the new lighting system across the whole city. It’s part of their drive to achieve energy self-sufficiency in the next 40 years. Eolgreen intends to ramp up production to 700 streetlights by the end of the year. While the sustainable energy developers continue to improve efficiency, they hope their system will soon be brightening streets all over Spain.

Source: http://www.upc.edu/
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http://www.eolgreen.com/

Black Silicon Solar Cells Efficiency Jump

Researchers from Aalto University (Finland) together with colleagues from Universitat Politècnica de Catalunya (Spain) have obtained the record-breaking efficiency of 22.1% on nanostructured silicon solar cells as certified by Fraunhofer ISE CalLab. An almost 4% absolute increase to their previous record is achieved by applying a thin passivating film on the nanostructures by Atomic Layer Deposition, and by integrating all metal contacts on the back side of the cell.black_silicon_solar_cell_hele_savin_aalto_university_en

The surface recombination has long been the bottleneck of black silicon solar cells and has so far limited the cell efficiencies to only modest values. The new record cells consists of a thick back-contacted structure that is known to be highly sensitive to the front surface recombination. The certified external quantum efficiency of 96% at 300nm wavelength demonstrates that the increased surface recombination problem no longer exists and for the first time the black silicon is not limiting the final energy conversion efficiency. The energy conversion efficiency is not the only parameter that we should look at, explains Professor Hele Savin from Aalto University, who coordinated the study. Due to the ability of black cells to capture solar radiation from low angles, they generate more electricity already over the duration of one day as compared to the traditional cells.

The results were published online 18.5.2015 in Nature Nanotechnology.
Source: http://www.aalto.fi/

Solar Cell: How To Boost Perovskites Performance

One of the fastest-growing areas of solar energy research is with materials called perovskites. These promising light harvesters could revolutionize the solar and electronics industries because they show potential to convert sunlight into electricity more efficiently and less expensively than today’s silicon-based semiconductors. These superefficient crystal structures have taken the scientific community by storm in the past few years because they can be processed very inexpensively and can be used in applications ranging from solar cells to light-emitting diodes (LEDs) found in phones and computer monitors.
A new study published online in the journal Science by University of Washington (UW) and University of Oxford researchers demonstrates that perovskite materials, generally believed to be uniform in composition, actually contain flaws that can be engineered to improve solar devices even further.
peroskite solar cell
Perovskites are the fastest-growing class of photovoltaic material over the past four years,” said lead author Dane deQuilettes, a UW doctoral student working with David Ginger, professor of chemistry and associate director of the UW Clean Energy Institute.

In that short amount of time, the ability of these materials to convert sunlight directly into electricity is approaching that of today’s silicon-based solar cells, rivaling technology that took 50 years to develop,” deQuilettes said. “But we also suspect there is room for improvement.”

Perovskite solar cells have so far have achieved efficiencies of roughly 20 percent, compared to about 25 percent for silicon-based solar cells. The team found “dark” or poorly performing regions of the perovskite material at intersections of the crystals. In addition, they discovered that they could “turn on” some of the dark areas by using a simple chemical treatment.
Source: http://www.washington.edu/

Energy Storage for a Sustainable Home

The electric car maker Tesla has devised a new electric home battery, the PowerWall. Current generation home batteries are bulky, expensive to install and expensive to maintain. In contrast, Powerwall’s lithium ion battery inherits Tesla’s proven automotive battery technology to power your home safely and economically. Completely automated, it installs easily and requires no maintenance. The home battery charges using electricity generated from solar panels, or when utility rates are low, and powers your home in the evening. It also fortifies your home against power outages by providing a backup electricity supply. Automated, compact and simple to install, Powerwall offers independence from the utility grid and the security of an emergency backup.
Tesla PowerWall
Solar Powered Day and Night
The average home uses more electricity in the morning and evening than during the day when solar energy is plentiful. Without a home battery, excess solar energy is often sold to the power company and purchased back in the evening. This mismatch adds demand on power plants and increases carbon emissions. Powerwall bridges this gap between renewable energy supply and demand by making your home’s solar energy available to you when you need it.

Powerwall comes in 10 kWh weekly cycle and 7 kWh daily cycle models. Both are guaranteed for ten years and are sufficient to power most homes during peak evening hours. Multiple batteries may be installed together for homes with greater energy need, up to 90 kWh total for the 10 kWh battery and 63 kWh total for the 7 kWh battery.
Common household electricity consumption: Flat Screen TV, 0.1 kWh /hr. Lights Per Room, 0.1 kWh /hr. Laptop, 0.05 kWh /hr. Refrigerator, 4.8 kWh /day. Clothes Washer: 2.3 kWh each use. Clothes Dryer: 3.3 kWh each use.
Source: http://www.teslamotors.com/

Run A Car With Water And Air

The German automaker Audi announced it has created the first batch of liquid “e-diesel” at a research facility in Dresden. The clear fuel is produced through a “power to liquid” process, masterminded by the German clean tech company and Audi partner Sunfire.

The process uses carbon dioxide, the most common greenhouse gas, which can be captured directly from air. Carbon dioxide is created largely by burning fossil fuels and contributes to global warming. Now Sunfire said it can recycle the gas to make a more efficient, carbon-neutral fuel.
Unlike conventional fossil fuels, the “e-diesel” doesn’t contain sulphur and other contaminants.
audi e-diesel
The engine runs quieter and fewer pollutants are being created,” Sunfire‘s Christian von Olshausen said.
The fuel is produced in three steps. First, the researchers heat up steam to very high temperatures to break it down into hydrogen and oxygen. This process requires temperatures of over 800 degrees Celsius (1,472 Fahrenheit) and is powered by green energy such as solar or wind power.
Second, they mix the hydrogen with carbon dioxide under pressure and at high temperature to create so-called blue crude. Lastly, the blue crude is refined into fuels in a similar way fossil crude oil is refined into gasoline.
Audi (AUDVF) said its lab tests have shown the “e-diesel” can be mixed with fossil fuels or used as a fuel on its own.
At this stage the e-diesel cost 40 % more than the regular gasoline per liter to produce.
Source: http://www.sunfire.de/
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http://money.cnn.com/