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The dish is composed of a set of 10 inch by 12 foot curved mirrors, like the one seen here. The students easily mount the mirrors to the aluminum framework using simple hardware like washers and zip ties.  (Source: MIT)

The mirrors incredible power makes short work of a beam of wood, disintegrating it in flames and smoke. The focal point can melt steel.  (Source: MIT)
New solar dish from MIT concentrates sunlight intensely enough to melt steel

The solar industry is booming.  With waves of investment and grants, the solar power industry is for the first time becoming a serious business.  New power plants will soon be pumping power out to consumers, while other firms market to sell panels directly to the consumer, providing them with a more direct means of experiencing solar energy.

There are many forms of solar power technology.  Today the most dominant is photo-voltaics, which comprise the traditional solar panels that come to mind when one thinks of solar power.  However, there are other promising ways of capturing the sun's energy that are merely less developed.

Among these is a parabolic collector.  A parabolic collector consists of an array of mirrors focused on a singular point, which they heat to a high temperature.  By placing water or another liquid at the collector, energy can be stored in the form of a phase transformation, and later harvested through a turbine generator.

However, parabolic collectors are still a relatively new field of research.  Their true potential remains relatively unknown.  A glimpse of it was provided by a research team at MIT, which developed a new parabolic collector design, which will blow away current solar power designs in terms of efficiency.

The MIT team believes that their lightweight, inexpensive device holds the promise of revolutionizing the power industry and providing solar power to even remote regions.

The key piece is the 12-foot dish, which the team assembled in several weeks.  The design is exceedingly simple and inexpensive.  The frame is composed of aluminum tubing and mirrors are attached to it.

The results are staggering -- the completed mirror focuses enough solar energy at its focal point to melt solid steel.  The energy of typical sunlight is concentrated by a factor of 1,000.  This was showcased during a demonstration, in which a team member held up a board, which instantly and violently combusted, when brought within range of the focal point.

By directing the dish at a more practical target -- water piped through black tubing -- steam can be flash created, offering instant means of producing energy or providing heating. 

Spencer Ahrens, who just received his master's in mechanical engineering from MIT, was among the designers of the dish.  He and his fellow team members are serious about marketing it, and leveraging its cheap cost and easy production.  They have founded a company named RawSolar.  They say their design is easily mass producible and that they hope to be pumping out 1,000 of dishes in years to come.

The new dishes would return their costs in a mere couple years, unlike standard photo-voltaic installations which can take 10 years or more to return their costs.  This improvement is critical to providing practical economic justification for adoption.

The dish is based partly on components invented and patented by inventor Doug Wood.  He was so pleased with the team's work that he signed over rights to the components to the team.  He elates, "This is actually the most efficient solar collector in existence, and it was just completed.  They really have simplified this and made it user-friendly, so anybody can build it."

Wood says one of the keys to the success of the project is the smaller size.  Dishes are affected by the same weight dynamics that effect living organisms.  Much as large living organisms would need an inordinate amount of weight support and thus are not favored, larger dish designs fall short in that they require an exponentially greater amount of infrastructure.  For example, a dish the size of the RawSolar team's design costs only a third of what a larger dish would cost.

MIT Sloan School of Management lecturer David Pelly gave a guiding hand to the students and thinks the economic upsides of the technology are impressive.  He states, "I've looked for years at a variety of solar approaches, and this is the cheapest I've seen. And the key thing in scaling it globally is that all of the materials are inexpensive and accessible anywhere in the world.  I've looked all over for solar technology that could scale without subsidies. Almost nothing I've looked at has that potential. This does."

The ability to build unsubsidized, profitable, and easy to manufacture solar power will truly be something amazing.  This should be an exciting technology to follow as it is marketed and further developed.

Besides Ahrens, the other students primarily working on the project were Micah Sze (Sloan MBA '08), UC Berkeley graduate and Broad Institute engineer Eva Markiewicz, Olin College student Matt Ritter and MIT materials science student Anna Bershteyn.



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RE: Mythbusters
By masher2 (blog) on 6/22/2008 12:37:22 PM , Rating: 2
> "It wasn't the distance itself that made it fail, it was the fact that the ship was moving"

But of course, in the time of the Persians, attacking ships would not have always been moving. In this day of motorboats and jet skis, people forget that ancient ships could not move against wind and tide. You couldn't simply sail (or even row) into any harbor whenever you wished; you needed conditions to be right.

The normal process was therefore to approach a harbor, then anchor until tide and/or wind was favorable for entry.


RE: Mythbusters
By tmouse on 6/24/2008 9:43:33 AM , Rating: 2
I guess you did not see the show. The MIT group tried and totally failed. The materials available at that time (bronze) was far inferior to silvered glass, the ship was rock steady in their tests in a calm bay slip, not the ocean; even bringing it in to 50 feet just got a slow smolder (this was a VERY dry old ship, not one that just made a voyage and would have been far damper). Add to this Syracuse faced east limiting the use of the weapon to the weaker morning rays and the availability of other more practical fire based methods and it seems very implausible. Even historically; it took 300 years to even mention that fire was used in the battle and the use of mirrors was never mentioned till 800 years later.


RE: Mythbusters
By mindless1 on 6/26/2008 6:16:57 PM , Rating: 2
Maybe they spent a great deal more time refining it than the basic mythbusters test did. Mythbusters is an interesting show but they try to take a know-it-all attitude instead of realizing they don't actually have all the variables resolved in their one-off tests.


RE: Mythbusters
By tmouse on 6/27/2008 8:21:10 AM , Rating: 2
Possibly but not likely; this is the second or third time they looked into it and the MIT group spent ALOT of time on it. Think about it; a defense like that would not likely disappear. Even though things like the formula for Greek fire are gone there are MANY independent references to it and most of the other colossal weapons developed during that age. There is only a single reference to the magic mirror, the rest are references to it.


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