World’s Most Efficient Solar Technology Coming Early 2010
The long-awaited commercial deployment of the world’s most efficient solar technology looks like it will now be near Phoenix, in a 1.5-megawatt, 60-unit deployment of Stirling Energy Systems’ solar thermal collectors.
Announced late last week, the 60-dish Maricopa Solar project will be the first commercial-scale solar facility built using Stirling Energy Systems/Tessera Solar’s SunCatcher concentrating solar technology.
The SunCatcher consists of a solar concentrator in a dish structure that supports an array of curved glass mirrors. Iterations of the SunCatcher have been among the world’s most efficient machines for solar-to-grid electric conversion for twenty years, most recently breaking the record last year with the highest-ever conversion rate of 31.25%.
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The project will serve as a precursor to the deployment of much larger commercial projects previously announced in California and Texas that total more than 1,600 MW.
“It’s like kicking the tires,” said Sean Gallagher, vice president of marketing and regulatory affairs for Stirling Energy Systems, in an interview earlier this summer. Gallagher added that the credit crunch made a demo project more critical than before to win financial support. “We think that the lenders and investors are going to want to see more of a slice of a system operating and some data before they are willing to finance larger projects.”
Mixing the old with the new
The SunCatcher mixes old technology with new design. By employing a system of mirrors attached to a parabolic dish to concentrate the sun’s energy onto a high‐efficiency Stirling Engine, each dish can generate up to 25,000 watts of power.
At its most intense spot, the heat produced is equivalent to a blistering 13,000 suns, “That’ll melt almost anything known to man,” says Sandia National Laboratories’ engineer Chuck Andraka. “It’s incredibly hot.” Sandia has worked extensively on developing the new iteration of the technology.
The SunCatcher is a 40-foot wide, 25-kilowatt-electrical (kWe) solar dish Stirling system designed to automatically track the sun and collect and focus solar energy onto a Power Conversion Unit (PCU), which then generates electricity.
The PCU converts the focused solar thermal energy into grid-quality electricity with a a closed-cycle, four-cylinder, reciprocating Solar Stirling Engine utilizing an internal working fluid that is recycled through the engine. The hydrogen gas in the PCU’s solar receiver tubes heats up and this gas in turn powers the Solar Stirling Engine.
Stirling Engines have been around for over a century-and-a-half and are recognized for their efficiency, reliability, and because they can use almost any external heat source to power the engine.
An additional advantage of the technology is that the SunCatcher requires no water for heating or cooling and a minimal amount of water is required to wash the mirrors. The water component is particularly helpful in the dry climate of the desert southwest, where this and other future projects are currently in development.
Using the North American automotive supply chains for solar deployment
“They have the lowest water use of any thermal electric generating technology, require minimal grading and trenching, require no excavation for foundations, and will not produce greenhouse gas emissions while converting sunlight into electricity,” said Sandia engineer Andraka.
By utilizing the automotive supply chain to manufacture the SunCatcher, Tessera hopes to leverage leverage the talents of an industry that has refined high-volume production through an assembly line process. The forty reflective mirrors needed for the construction of each dish are formed into a parabolic shape using stamped sheet metal similar to the hood of a car. The mirrors are made by using automobile manufacturing techniques.
The company says more than 90 percent of the SunCatcher components will be manufactured in North America.
Because of the Maricopa Solar Project’s proximity to existing grid infrastructure—adjacent to the 650-megawatt Agua Fria generating station—project leaders say it should be online in early 2010.
via: Clean Edge
If you do the math, this thing is only about 18.5% efficient. That’s definitely not “the most efficient solar technology.” The headline is a lie.
This is pretty remarkable. I just checked the average output of nuclear plants, and the TX and CA installs make the grade. Next, battery technology to get us off gas and onto the sun.
Robert- Sandia National Laboratories did the math in January, 2008. Not sure where you get your numbers, but I’m going with Sandia.
Robert says that the efficiency is only 18.5% without showing how he arrives at this figure. Other PV systems report is the low teens, so why would this not be more efficient. This system also uses the least amount of land when compared to other CSPs.
nice article. but probably when they are on the market in 2010. There already be better ones.
Robert is probly vested in solar troughs, towers or PV. Or fossil fuels. That’s just how humans (Americans) work. We seem to be willing to do anything to each other for money. Like lie, or call other people liars.
This seems like fantastic way to get Detroit back into production. Something for after cash for clunkers. I wonder what the lifetime is on these units. How long will a Stirling engine run for? Mirror degradation?
PVinsights.com did the math and the efficiency of this technolgoy is around 21.414%. The methodlogy is the following formulas. 25,000 watts / ((3.14159*20* 0.3048*20*0.348) * 1,000 watts) is equal to 21.414%.
I have to agree with Timothy on this one. I would assume that they don’t just put up random numbers for the hell of it. Would they be able to make smaller versions of these to be able to put on a rooftop as well? this could completely dispose of large bulky panels that look atrocious.
As long as you can put these things on an existing transmission line, that makes them more cost effective. If you have to build a new line, you’re talking big bucks, years to implement, and increasing energy loss in proportion to increasing distance of power transmission.
Localizing energy is more desirable and more efficient. It’s not just how pristine the technology is - It’s also how you implement it. I would rather see a 10 foot diameter unit that would be more useful. Connect it directly to the neighborhood grid. Minimize expensive, time consuming, ugly transmission lines cluttering our landscape.
Smaller units could go directly on the roofs of factories, warehouses, department stores and commercial businesses, airports, schools and universities, hospitals, appartment buildings, government and military buildings, etc. - even homes.
Arizona, West Texas and the desert SW can really capitalize on this. Congratulations to the developers of this design for their long term effort.
This could sure help Vegas out. The water behind Hoover Dam is getting lower by the year and less energy production follows. But it only means they will be able to turn the lights on earlier and keep them on longer.