Solar Energy

Solar-powered cooker nabs climate prize

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Prize for ‘Sun in the box’ cooker

At the heart of the idea is a simple black painted box…

A cheap solar cooker has won first prize in a contest for green ideas.

The Kyoto Box is made from cardboard and can be used for sterilising water or boiling or baking food.

The Kenyan-based inventor hopes it can make solar cooking widespread in the developing world, supplanting the use of wood which is driving deforestation.

Other finalists in the $75,000 (£51,000) competition included a device for streamlining lorries, and a ceiling tile that cools hot rooms.

Organised by Forum for the Future, the sustainable development charity founded by Jonathan Porritt, the competition aims to support concepts that have “moved off the drawing board and demonstrated their feasibility” for reducing greenhouse gas emissions, but have not gained corporate backing.

With as many people as there are in the developing world today, they can’t just cook using trees – they’ll finish off all the trees
Jon Bohmer, Kyoto Energy

“The Kyoto Box has the potential to transform millions of lives and is a model of scalable, sustainable innovation,” said Peter Madden, the forum’s chief executive.

It is made from two cardboard boxes, which use reflective foil and black paint to maximise absorption of solar energy.

Covering the cooking pot with a transparent cover retains heat and water, and temperatures inside the pot can reach at least 80C.

As many as two billion people in the world use firewood as their primary fuel.

Read moreSolar-powered cooker nabs climate prize

The 10 big energy myths

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There has never been a more important time to invest in green technologies, yet many of us believe these efforts are doomed to failure. What nonsense, writes Chris Goodall

Myth 1: solar power is too expensive to be of much use

In reality, today’s bulky and expensive solar panels capture only 10% or so of the sun’s energy, but rapid innovation in the US means that the next generation of panels will be much thinner, capture far more of the energy in the sun’s light and cost a fraction of what they do today. They may not even be made of silicon. First Solar, the largest manufacturer of thin panels, claims that its products will generate electricity in sunny countries as cheaply as large power stations by 2012.

Read moreThe 10 big energy myths

Environment: Solar plant yields water and crops from the desert

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· Green energy glasshouses may transform arid areas
· Fresh water will end need to dig wells, say architects


The Sahara forest project will use seawater and solar power to grow food in greenhouses across the desert. Photograph: Exploration Architecture

Vast greenhouses that use sea water for crop cultivation could be combined with solar power plants to provide food, fresh water and clean energy in deserts, under an ambitious proposal from a team of architects and engineers.

The Sahara Forest Project, which is already running demonstration plants in Tenerife, Oman and the United Arab Emirates, envisages huge greenhouses with concentrated solar power (CSP), a technology that uses mirrors to focus the sun’s rays, creating steam to drive turbines to generate electricity.

The installations would turn deserts into lush patches of vegetation, according to its designers, and do away with the need to dig wells for fresh water, an activity that has depleted aquifers across the world.

Read moreEnvironment: Solar plant yields water and crops from the desert

Solar Cell Sets World Efficiency Record

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Scientists at the U.S. Department of Energy’s National Renewable Energy Laboratory (NREL) have set a world record in solar cell efficiency with a photovoltaic device that converts 40.8 percent of the light that hits it into electricity. This is the highest confirmed efficiency of any photovoltaic device to date.

Read moreSolar Cell Sets World Efficiency Record

How to Make a Solar Power Generator for Less Than $300

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Using parts easily available from your local stores, you can make a small solar power generator for $250 to $300. Great for power failures and life outside the power grid. Power your computer, modem, vcr, tv, cameras, lights, or DC appliances anywhere you go. Use in cabins, boats, tents, archaeological digs, or while travelling throughout the third world. Have one in the office store room in case of power failures in your highrise. I keep mine in my bedroom where it powers my cd player, turntable, lights, modem, laptop, and (ahem) a back massager. I run a line out the window to an 8″ x 24″ panel on the roof.

Read moreHow to Make a Solar Power Generator for Less Than $300

MIT group makes low-cost dish to tap solar energy

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Photo

Spencer Ahrens, a 23-year-old mechanical engineer, was on MIT’s campus last week, holding a wooden plank, surrounded by onlookers.

Slowly, he turned that wooden plank before a series of mirrors that had been placed inside an aluminum frame, until the wood caught fire.

That was quite a moment, recalled Matthew Ritter, one of the onlookers.

“Let’s just say it was a small combustion for wood materials, but a giant explosion of solar energy,” he said.

Ahrens, Ritter and the other people who helped create the solar-powered dish that harnessed the sunlight that eventually burned the wood say they’ve just created the world’s most cost-efficient solar power system.

They also say these dishes may revolutionize global energy production.

“You can stick these things wherever there is a piece of sunlight, and power a home or an industrial plant,” said Ahrens, who just received his master’s degree from MIT.

Since January, he’s been working with Ritter, an Olin College student; Micah Sze, a recent graduate of MIT’s Sloan School of Management; University of California-Berkeley graduate and Broad Institute engineer Eva Markiewicz and MIT materials science student Anna Bershteyn.

Together, they built a 12-foot wide solar panel by piecing together lightweight aluminum tubes to make the frame. Inside, they arranged a series of mirrors and then attached a water-filled coil at the bottom of the frame.

When the frame is properly positioned, the mirrors will direct concentrated sunlight toward the coil.

As the water heats up, it is converted to steam, and that steam, the creators say, can be used to generate electricity to heat and cool homes and power machines.

They now say its design is so simple, it can be built and placed just about anywhere the sun shines.

“We made it by hand and transported the parts by car or by bike,” Ritter said.

The crew spent about $5,000 to build the dish, and according to MIT Sloan School of Management lecturer David Pelly, it is the cheapest way he’s seen to harness that much sun power.

“I’ve looked for years at a variety of solar approaches, and this is the cheapest I’ve seen,” he said.

Ahrens, Ritter and the others are now packing up and moving to California, where they plan to mass-produce the dishes, probably for less than it cost to build the first one.

Their new company is called RawSolar, and Ahrens said its possibilities are endless.

“The energy crisis affects so much of what we do,” Ahrens said. “It’s driving food prices and water problems and airline fares, and we are trying to work through these things in an environmentally and economically sustainable way.”

After all, he said, “Sunlight is free.”

Source: Boston Herald