Japan aims to beam solar energy down from orbit

Japan aims to beam solar energy down from orbit

by Paul Sutherland

The Japanese space agency JAXA is developing a revolutionary concept to put “power stations” in orbit to capture sunlight and beam it to Earth.

The country has been looking for new power sources following the devastating earthquake and tsunami in March, 2011, that destroyed much of the north-east of the country and caused a meltdown at the Fukushima Daiichi Nuclear Power Plant.

Many of the country’s nuclear reactors were closed due to stricter safety regulations after the emergency. Now JAXA is aiming to set up a Space Solar Power System (SSPS) by 2030. An array of mirrors would sit in geostationary orbit to collect solar energy and then transmits it to a power plant on the ground via microwaves or laser beams. There it could be used to generate electricity and hydrogen.

Proponents of the technology say that it would provide continuous energy without any worry that resources would be depleted. It would be unaffected by the time of day or weather and would provide environmentally friendly, clean energy.

Interestingly, the idea is not a new one. An American, Dr Peter Glaser, designed a similar concept in 1968 to deploy large solar panels in space to generate power and convert it into microwaves to transmit to the ground. Following studies by NASA and the US Department of Energy, the project was deemed too costly and it was never developed.

Similar studies have been carried out in Europe. The idea is also reminiscent of a Russian plan in the 1990s to use mirrors to beam sunlight to the ground at night. This had astronomers and environmentalists up in arms because of the light pollution it would have caused. The Japanese concept is different because there would be no stray light emitted from the beam.

How the solar beam from space will be received by a power planet on Earth. Credit: JAXA

Yasuyuki Fukumuro is leading research and planning for SSPS. He says: “We have not yet decided whether to use microwaves or laser beams with SSPS, or whether we will somehow combine them. We are currently conducting ground-based experiments to find the most efficient way to transmit energy.

“Regardless of which transmission technology we use, when we collect sunlight from outside the Earth’s atmosphere, we can get a continuous supply of it, with almost no influence from the weather, the seasons, or time of day, allowing very efficient collection of solar energy.

“And since the energy source is the Sun, it’s an endlessly renewable resource - it won’t run out as long as the Sun is there. Also, because the power is generated in space and carbon dioxide is emitted only at the receiving site, emissions within the Earth’s atmosphere can be greatly reduced, which makes this technology very friendly to the environment.”

Fukumuro admits the system has its challenges. He says: “When transmitting power by microwaves, a significant technological challenge is how to control the direction, and transmit it with pinpoint accuracy from a geostationary orbit to a receiving site on the ground. Transmitting microwaves from an altitude of 36,000 km to a flat surface 3 km in diameter will be like threading a needle.”

A video demonstrates how the Space Solar Power System will work. Credit: JAXA

Fukumuro suggests the technology will also be useful in disaster situations. In the event of a blackout, a collecting dish could be unfolded and deployed to receive microwaves from space for conversion into electrical energy.

JAXA is working with a collective of machining and engineering companies called Kyoto Shisaku Net to develop the array of reflectors that would be lifted into orbit by reusable shuttle-like spacecraft and then assemble themselves.

JAXA Engineer and Senior Researcher Katsuto Kisara says: “The biggest problem we’ve encountered with the project is developing solar mirrors that are incredibly lightweight. I think that there is certainly a way to do it, but it has presented quite the challenge.”


From Sen @ http://www.sen.com/news/japan-aims-to-beam-solar-energy-down-from-orbit

 

 

Advanced Mission Research Group

 

Space Solar Power Systems (SSPS) are designed to collect solar energy with a large-scale solar collector installed in outer space and transmit the solar energy to Earth as either microwave or laser energy, which is converted into electric power for use. The Advanced Mission Research Group researches energy transmission technologies that use microwaves and lasers, large-scale structure construction technologies for outer space and other technologies for the SSPS.

Goal

 Solar energy is regarded as a stable, low-CO₂-emission energy source for the future. The SSPS is designed to transmit about 1 GW of solar energy per station (equivalent to the amount of electric power generated by a nuclear power station) from outer space to Earth at a low cost in order to be converted into electric power for terrestrial use.
The Advanced Mission Research Group conducts experiments on energy transmission using microwaves and lasers between ground locations, and on the assembly of largescale structures with the aim of establishing the SSPS technologies.

Research objectives

 

1. Research on Microwave Energy Transmission Technology

 

 Fig. 1 Test-fabricated 5.8-GHz-band Class F amplifier

In order to realize the microwave-SSPS (M-SSPS), it is very important to enhance the efficiency of microwave power transmission units and to control the beam direction of antennas with high accuracy.

In fiscal 2007, the group test-fabricated a 5.8-GHz-band Class F amplifier using a GaN semiconductor device fabricated experimentally in fiscal 2006 (Fig. 1) and evaluated the performance.

As a result, the group achieved the highest efficiency: a drain efficiency of 76.5%, a power added efficiency (PAE) of 68.7%, and an output power of 2.45 W. Since fiscal 2008, we have researched equipment to control the beam direction of antennas with high accuracy. We plan to perform a kW-class power transmission experiment (transmission distance of 100 m) in fiscal 2013.

 

2. Research on Laser Energy Transmission Technology

 

 

 Fig. 2 Laser transmission test up to a distance of 500 meters
(Kakuda Space Center)

Laser beam technology for direct conversion from solar energy as well as laser energy transmission technology are very important in order to realize the laser-SSPS (L-SSPS).

The group is researching enhanced efficiency and improved output power of a solar-pumped solid-state laser using Nd/Cr:YAG ceramic laser material in addition to long-distance transmission at the 500-meter laser transmission test facility (Kakuda Space Center) (Fig. 2), and weather dependency of atmospheric transmission.

 3. Research on Large-Scale Structure Construction Technology

 

Fig. 3 Test-fabricated inflatable structure

SSPS require a large structure to be assembled in orbit. A 2.5 km × 3.5 km elliptical condensing mirror, for example, must be assembled for the M-SSPS.

In order to establish technology for assembling such large structures, the group studies lightweight structural forms such as inflatable structures (Fig. 3).

From Japan Aerospace Exploration Agency @ http://www.ard.jaxa.jp/eng/research/advancedmrg/amrg-index.html

Space Based Solar Power

The concept of SBSP was theorized over 40 years ago by renowned scientist Dr. Peter Glaser. Since then, in response to periodic energy crises, the idea has been re-evaluated from time to time by the U.S. Department of Energy, NASA, major aerospace companies and countries such as Japan and India. Their studies generally concluded that there is no technical barrier to implementing SBSP; rather, the principal impediment has been economics -- the ability to provide SBSP at a cost that is competitive with other energy sources.

Solar power satellites are large arrays of photovoltaic panels assembled in orbit, which use very low power radio waves to transmit solar power to large receiving antennas on Earth. The resulting power can either supplement, or be a substitute for, conventional electricity sources. Several of the technologies required to build a working SBSP satellite have, in principle, already been developed---and some of the component technology is already in use across a variety of sectors.

The advantage of placing solar collectors in geosynchronous Earth orbit (GEO), about 36,000 kilometers above Earth, is that it uses the constant and unobstructed output of the Sun, unaffected by the Earth's day/night cycle.

By contrast, ground-based solar power provides a vital and valuable addition to the Earth's energy needs, but is limited by these factors:

• Weather

• Variable seasons

• Atmospheric blocking of sunlight

• Poor direct sunlight at higher and lower latitudes

• Expensive and limited storage capacity

Because none of these factors applies to SBSP, an SBSP cell can provide an estimated 6-8 times more power than a comparable solar cell on the Earth's surface.

A long-range wireless power transmission test was conducted in mid-2008, successfully transmitting a microwave beam (similar to the kind that would be used to transmit energy from space to Earth) between two Hawaiian Islands across 148 kilometers---more than the distance from the surface of the Earth to the boundary of space. This test demonstrated the technical feasibility of transmitting SBSP to Earth.

The frequency of radio waves sent down from an SBSP satellite would be comparable to cell phone, wireless Internet, or cordless phone signals. Based on several studies done by NASA, this transmission is safe to human, animal, and plant life near the receiving antennas---large structures designed to convert the radio waves into usable electricity.

These antennas would be placed in areas with limited access to mainline grid power, giving rural and developing areas a much-needed power alternative. They might also be placed close to main power grids to provide a substantial amount of grid power.

Recently, as efficiencies of solar cells and other core systems have increased, and the price of (and demand for) energy has risen, SBSP has become more commercially viable. Factors that have contributed to this development include:

• Efficiency and mass of photovoltaic cells (becoming more efficient and lighter, as well as cheaper)

• Wholesale electricity cost increases

• Demand for electricity (increasing rapidly)

• The availability and cost of commercial space lift transportation (becoming cheaper, faster, and more reliable, with billions of development dollars now being invested)

• The identification of additional, easily accessible revenue streams for SBSP

With these new efficiencies and price points, the cost of a viable SBSP solution is substantially lower than just a few years ago.


From Space Energy @ http://www.spaceenergy.com/SBSP/SBSP_Overview.htm




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New leaf: The promise of artificial photosynthesis

New leaf: The promise of artificial photosynthesis

 

It’s chemistry’s greatest challenge – inventing systems that turn water and sunshine efficiently into cheap, clean energy for all

LOOK at a plant soaking up the Sun, and it is hard not to feel a tinge of jealousy. There they sit, day after day, extracting vast amounts of fuel from sunlight, all the while expelling nothing more objectionable than the oxygen we need to breathe. Our fuel-making exploits are ruinously costly and disruptive by comparison: we rip coal, oil and gas from the ground and burn it to produce far more planet-baking carbon dioxide than anyone can use.

What we wouldn’t give to mimic the tactics of plants, the true green warriors. “More energy hits the Earth from the sun in 1 hour than mankind uses in an entire year,” says Nate Lewis, a chemist at the California Institute of Technology in Pasadena. We know how to turn that energy into electricity – that is what photovoltaic cells are all about. But the sun does not always shine when and where we want it to. Through photosynthesis, plants have the enviable ability to convert sunlight into fuels that they can store now and burn later. If we could do the same, saving solar energy for a rainy day, transporting it to gloomier climes or pumping it straight into a fuel tank, a large part of our energy problems would be solved.

Now megabucks are flowing from, among others, the US government and big energy corporations to try to make that happen. The challenge of artificial photosynthesis is set – but it is proving to be one of the greatest challenges of all.

No one said photosynthesis was easy. It took plants millions of years to evolve it, and even now they aren’t especially good at it. Photosynthesis is all about using the sun’s energy to split water into its constituents, hydrogen and oxygen, and rearranging them into chemically more energetic molecules – in the case of plants, carbohydrates made with the help of atmospheric carbon dioxide. But a standard crop plant stores just a few per cent of the available solar energy in carbohydrates. If the sun shines too intensely its machinery is overwhelmed, shutting down production after about half an hour. The complex natural catalysts that help the process along degrade quickly and must constantly be renewed.

Carbohydrates are not the best storage fuels for our purposes, either. We need something purer, cleaner-burning and with a higher energy density. Hydrogen is a clear choice. It packs a huge punch, storing two-and-a-half times as much energy per kilogram as conventional gasoline. Put it in a fuel cell and you can generate electricity on demand by recombining it with oxygen, with a side product of clean, drinkable water.

All this means artificial photosynthesis is not just about mimicking photosynthesis; it is about doing it better. “It sounds so simple: you’re just splitting water,” says Daniel Gamelin, a chemist at the University of Washington in Seattle. The devil, though, is in the detail. First you must build an “antenna” akin to a conventional photovoltaic cell to absorb light and use its energy to liberate electrons. Then the chemistry kicks in: those electrons must be guided by catalysts in a complex dance to react with the right molecules to produce the fuels we want.

In 1998, John Turner, working with his colleague Oscar Khaselev at the US National Renewable Energy Laboratory in Golden, Colorado, set the standard. “I was just walking down the hall one day and saw a poster about artificial photosynthesis, and thought – I can help with that,” he says. After a year of fiddling with parts, including the solar panels from NASA’s Mars rovers, he had his device: a semiconducting chip a few millimetres square that sat in a beaker of dilute battery acid with platinum catalysts. In sunlight, hydrogen gas began bubbling merrily off the chip’s surface carrying a full 12 per cent of the incoming sunlight’s energy (Science, vol 280, p 425).

There were a few snags, however. The hydrogen bubbled off together with oxygen, a potentially explosive mixture. The device conked out after about 20 hours, as its parts were oxidised and etched away; a gentler system would have fed off water, not battery acid. And it didn’t come cheap: at one or two dollars per square centimetre, Turner reckons it was about 10 times too expensive to make hydrogen affordably.

Similar issues have afflicted all artificial photosynthetic systems since. “You’ve got this three-legged stool: a system has to be efficient, it has to be cheap, and it has to be robust,” says Gamelin. Cracking all three at once is the problem, says Lewis. “Pick any two criteria and I can give you that.”

The new money aims to get that third leg in place. In 2010, Lewis was signed up to head a new Joint Center for Artificial Photosynthesis based in California, supported by $122 million of Department of Energy funding. That same year,Sun Catalytix, a company born of chemist Dan Nocera’s work on artificial photosynthesis at the Massachusetts Institute of Technology, raised $9.5 million from funders including the Indian conglomerate Tata. And scores of other research groups, including Turner’s and Gamelin’s, are in the game too.

 

Finicky beasts

 

 

The first major task is to find the best material for the antenna. Silicon is relatively cheap and abundant, and absorbs a good chunk of the high-energy photons in the sun’s rays, making it the standard for conventional solar cells. But it spits out electrons with an energy of 1.1 electronvolts. Splitting water takes a minimum of 1.23 electronvolts, and in practice needs more to kick-start the reaction.

One way to make up the difference is to stack layers of silicon. Rather like connecting batteries in series, this gives electrons a voltage boost. The latest Sun Catalytix system uses “triple junction” silicon, which works but comes at three times the cost of solar-panel material. Silicon also reacts with oxygen to make an insulating layer of silica, which stops electrons reaching the surface of the antenna where they can be of use. Coating the silicon with an antioxidant can add cost and reduce efficiency. Turner’s benchmark device used stacks of gallium arsenide and gallium indium phosphide semiconductors, which absorb energy from different wavelength ranges of light, to multiply the voltage produced, but also suffered from oxidation.

A solution might be to use metal-oxide semiconductors. By their nature these do not oxidise further, which makes them extremely durable, and they are often cheap. But there are billions of combinations of different metals that can make oxides, and finding one with the right properties – that absorbs the right spectrum of light and kicks out enough electrons with the right energy – is not easy. “Oxides are very finicky beasts,” says Turner. His team is modelling the likely behaviour of different oxides and have hit on a few good candidates, although they have yet to make them. It is also unclear how well the results will translate to reality, as the models can’t handle complications like imperfect crystal structures that are rife in cheaper materials.

Lewis and his team, meanwhile, plan simply to make every oxide they can think of and test them. “He’s in the back room mixing things,” says Turner. To help hack through the jungle, Lewis’s former supervisor Harry Gray has recruited an army of high-school students to make and test their own oxides. They mix up combinations of different metals in different proportions, fire a bank of LED lights at them and watch the voltage and current produced. Gray’s team checks samples that look promising, to determine the exact quantities of ingredients and the material’s structure. “We’ve gotten hundreds of potential hits, and something like 20 that are really good looking,” he says.

But a good antenna is still only part of the problem solved. Bathed in sunlight, it makes electrons and positively charged “holes” - absences of electrons. Left to themselves, the electrons might simply fall back into the holes and nothing useful would result. To split water, the device needs to line up four holes at one end to suck up electrons from water molecules, producing molecular oxygen and free protons. At the other end, two electrons from the antenna combine with these released protons to form molecular hydrogen (see diagram). Catalysts can smooth these processes, reducing the energy needed to get them going and acting as staging areas for the electrons and holes. Generally, two separate catalysts are needed, one for hydrogen and one for oxygen. Making efficient catalysts as cheaply as possible is another big part of the challenge.

Platinum, used by Turner for both catalysts, works well, but it costs about the same as gold, so the three-legged stool is still missing a leg. Nature has its own imperfect solutions. To make hydrogen, plants use hydrogenase enzymes, which contain a pair of iron atoms to shuffle the electrons. Protein branches around the atoms help the process along by juggling protons. Last year, Monte Helm and colleagues at the Pacific Northwest National Laboratory in Richland, Washington, showed that a similar catalyst with two atoms of nickel, an abundant and cheap element, works much faster than nature’s version (Science, vol 333, p 863) – although it hasn’t yet been tried out in a photosynthetic system. Simpler compounds, such as molybdenum sulphide, can also do the job. “I wouldn’t say anyone has a perfect hydrogen catalyst, but there’s a variety of good choices,” says Gamelin.

The oxygen-producing catalyst is trickier. Plants use proteins with four manganese atoms, one for each hole involved in the water splitting. But this protein degrades quickly and isn’t necessarily the fastest; in the lab, there are better options. Top dog is the highly efficient iridium oxide, but it is heinously expensive. Alternatives based on manganese itself and cobalt are being explored but nothing yet ticks all the boxes.

And that brings us to the really tricky bit of the process. A perfect antenna and perfect catalysts are not enough, says Lewis. “All the parts have to work together and at once.” Many catalysts work only in specific pH ranges, so cannot simply be paired up. Pernickety stuff like the nanostructures of the antenna and the catalysts can seriously affect the overall efficiency. Gamelin’s team, for example, is currently trying to optimise things by layering a cobalt-phosphate oxygen-producing catalyst onto just the right hole-delivering parts of a large-surface-area antenna. “There’s a little bit of voodoo in this process,” he says.

 

Buckets of sunshine

 

 

So how close is the voodoo to a workable spell: a realistic artificial photosynthesising system? While there has been no eureka moment, there have been some promising developments. Last year the Sun Catalytix team announced a wireless “artificial leaf” that works, not in battery acid as Turner’s did, but in water from Boston’s Charles river. It uses catalysts that are relatively efficient and cheap – a blend of nickel, molybdenum and zinc to make hydrogen, and cobalt-borate to spit out the oxygen (Science, vol 334, p 645).

But it is still a stool with legs missing. The device’s efficiency is 2.5 per cent, significantly less than Turner’s system from over a decade ago, and its components degrade after about a week. The antenna, made of triple-junction silicon, is expensive. The hydrogen it makes comes in at $6 or $7 per kilogram, according to Tom Jarvi, the firm’s chief technology officer. At the moment, making hydrogen by re-forming methane costs about $2.50 per kilo.

Of course, the company isn’t about to reveal ideas in the pipeline, but the broad aim is to have a system within 10 years that can spit out hydrogen for less than $3 a kilo at 5 per cent efficiency – with the emphasis on lower cost at the price of lower efficiency. The ultimate goal is to mass-produce photosynthesising particles of the sort that can be thrown in a bucket of dirty water to churn out fuel. “You can shrink your semiconductor down to a nanoscale and just disperse them in water. That’s the best path to low cost,” says Mike Decelle, CEO of Sun Catalytix. It could also mean an energy revolution in parts of the world far away from electricity grids, where sunlight is often abundant but access to clean water a problem. If fuel were available simply by putting a bucket of brackish water out in the sunshine and throwing in some specks of metallic dust, that could spell the end for paraffin lamps and the dirty, expensive and cantankerous diesel generators that millions rely upon to keep lights on and power up other essential services.

“It’s definitely really cool,” says Gamelin of that idea, and of what Sun Catalytix has demonstrated so far. Even so, Turner guesses it will be at least 15 years before something marketable hits the shelves from any lab. Lewis promises working prototypes within a couple of years, but admits the first ones won’t be cheap. Beyond that, he is thinking ahead to a time when the systems don’t just make hydrogen but, with a little more chemistry at the back end, a more complex, easier-to-transport fuel such as ethanol – potentially also pulling carbon dioxide out of the air in its production.

That’s still a way away. At the moment, says Lewis, “we’re like the Wright brothers. Our job is to fail fast and fail frequently and move ahead.” How fast failure breeds success will determine how soon we are making fuel as the sun shines.


Copyright New Scientist via Conscious Resonance @ http://consciousresonance.net/wordpress/new-leaf-the-promise-of-artificial-photosynthesis/

MIT creates solar cell from grass clippings

• By Sebastian Anthony

A researcher at MIT, Andreas Mershin, has created solar panels from agricultural waste such as cut grass and dead leaves. In a few years, Mershin says it’ll be possible to stir some grass clippings into a bag of cheap chemicals, paint the mixture on your roof, and immediately start producing electricity.

If you remember high school biology classes, you will hopefully remember a process called photosynthesis, whereby plants turn sunlight into energy. Mershin has found a process which extracts the photosynthesizing molecules, called photosystem I, from plant matter. Photosystem I contains chlorophyll, the protein that actually converts photons into a flow of electrons.

These molecules are then stabilized and spread on a glass substrate that’s covered in a forest of zinc oxide nanowires and titanium dioxide “sponges.” When sunlight hits the panels, both the titanium dioxide and the new material absorb light and turn it into electricity, and the nanowires carry the electricity away. In essence, Mershin has replaced the layer of silicon in conventional photovoltaic cells with a slurry of photosynthesizing molecules. “It’s like an electric nanoforest,” he says.

So far so good — now time for the reality check. At the moment, even with the efficiency-boosting nanoforest, Mershin’s solar panel only has an efficiency of 0.1%. To be of any use — to power more than a single LED light from an entire house covered in these cheap solar panels — an efficiency of 1 or 2% is required. With such a low barrier to entry, though, Mershin hopes that scientists the world over can now work on boosting the efficiency.

Ultimately the goal is to create a cheap plastic bag that comes pre-filled with the necessary chemicals, and “one sheet of cartoon instructions, with no words.” The idea is that you’ll add agricultural waste to the bag, stir it around, and then just slosh it onto a sheet of glass. Suffice it to say, such an invention would revolutionize power generation in low-density areas that are off the grid and developing nations.

From Extreme Tech @  www.extremetech.com/extreme/116689-mit-creates-solar-cell-from-grass-clippings

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