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Chicago's Willis Tower (formerly the Sears Tower) is America's tallest skyscraper. It will soon receive a solar makeover, making it the nation's largest vertical solar farm.  (Source: Ted Hubert)

The solar panels (artist's concept) will preserve the view, but reduce glare and generate electricity. The installation is expected to produce up to 2 megawatts of power when complete.  (Source: Pythagoras Solar)

Pythagoras Solar's special window design uses prisms to collect direct sunlight will allowing horizontal and diffuse sunlight to pass through, lighting the room.  (Source: Pythagoras Solar)

The actual product is seen here at an industry trade show.  (Source: Pythagoras Solar)
Project will be nation's largest solar farm

Alternative energy startup Pythagoras Solar is dreaming big and it has sold the owners of one of America's most iconic skyscrapers on its vision.

Chicago's Willis Tower (formerly known as the Sears Tower) is among the most recognizable man-made landmarks in the country.  Towering over local high-rises, its 108 stories make it the tallest building in the U.S. and the fifth-tallest freestanding structure in the world.

During summer months solar heating contributes to energy costs and sun glare can be an issue at times.

Pythagoras Solar power has cooked up a novel solution -- transforming the building into the nation's largest vertical solar farm.  The farm will produce up to 2 MW of solar energy, reducing the building's reliance on the power grid.

Its panels -- to be installed on the building's southern-facing windows that get the highest sun exposure -- will help remedy both issues, while preserving the view and producing electricity.

The company's pane design is dubbed high-density photovoltaic glass units (HD-PVGUs).  The device acts similar to louvered windows (think slat blinds).  It contains a thin layer of monocrystalline silicon, sandwiched between glass, which acts as a cell.  An internal plastic prism directs angled (direct) sunlight onto the cell, while allowing diffuse daylight and horizontal (less intense) sunlight through.

The result is that you still have attractive views out the window, without the glare or heating.  Meanwhile your panel produces electricity that Pythagoras Solar claims is on par with rooftop panels.  

If the installation is a success, it could set a precedent for high-rises across America.  The Willis Tower installation alone is expected to produce as much power as a 10-acre ground installation would.

Conserving land, particularly in a city, is obviously a tremendous concern.  The Willis Tower project could serve as a blueprint for skyscraper owners to reduce their energy costs and improve their buildings' sustainability in years to come.

Cost and maintainability are obvious concerns in the long run for solar window panels from companies like Pythagoras Power.  Indeed, Pythagoras Power offered little insight into how it would handle the extra maintenance burden or what the cost-per-window might be.  

That said, even if the company did provide such metrics, it'd be hard to fairly judge them, as this project is the first of its kind on this kind of magnitude.  Initial implementations of any technology typically start off high in terms of maintainability problems and cost, but eventually bring down both metrics.  

And the cost must not be overly exorbitant.  After all, the panels are good PR for the Willis Tower's owners, but they are in business to make money.  If the panels were overly expensive, the project likely wouldn't have received the green light to begin.



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2 MW per what?
By fezzik1620 on 3/22/2011 4:14:52 PM , Rating: 1
Is it just 2 MW over the life of the building? 2 MW/day? 2 MW/month? 2 MW/year? That would make a big difference. What are we actually talking about here?

Feel free to smack me down if it is in the article and I just missed it, but I'm not seeing it.




RE: 2 MW per what?
By McDragon on 3/22/2011 5:16:27 PM , Rating: 3
You're confusing power with energy. 2MW is a power output at one instance in time...if it can deliver this constantly over an hour, then it will have produced 2MWh of energy.


RE: 2 MW per what?
By Azethoth on 3/23/2011 1:58:42 AM , Rating: 2
Actually he is not confusing the two. He is specifically asking what exactly the energy output is. Everyone wants to know because without knowing that even the "printers powered per floor" and other exciting calculations above are meaningless.


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