Stories tagged solar

Sep
19
2010

Materials science

Materials scientists figure out ways to make things stronger, cheaper, or better. A favorite technique is nano-self-assembly. Just mix together the right ingredients and "presto", you get a wonder material. Another great development would be for the material to be self-repairing.

Self healing solar cells

MIT scientist, Michael Strano, and his team have created a material made up of seven different compounds including carbon nanotubes, phospholipids, and proteins. Under the right conditions they spontaneously assemble themselves into a light-harvesting structure that produces an electric current. The assembly breaks apart when a surfactant (think soapy solution) is added but reassemble when it is removed. These new self-healing solar cells are already about double the efficiency of today’s best solar cells but could potentially be many times more efficient.

Learn more about self-healing solar cells

Sep
04
2010

Arhchimedes heat ray: Did an array of mirrors set ships aflame 2200 years ago?
Arhchimedes heat ray: Did an array of mirrors set ships aflame 2200 years ago?Courtesy Finnrind

Solar powered heat ray

Did Archimedes use a heat ray to set enemy ships on fire over 2000 years ago? A text written about the Siege of Syracuse (212BC) some 400 years later merely said he lit the ships on fire. He could have used flaming arrows or perhaps hurled larger balls of flame via catapult.
Centuries later,

Anthemius of Tralles mentions burning-glasses as Archimedes' weapon.
This purported weapon has been the subject of ongoing debate about its credibility since the Renaissance

Myth Busted?

In 1973, an experiment using 70 mirrors, each with a copper coating and a size of around five by three feet, caused a mock-up ship 160 feet away to burst into flames within seconds.
A group of MIT students used a parabolic array of 127 "polished metal mirrors" 1 sq ft in size for a 2005 MythBusters episode and were barely able to set part of the "ship" aflame.

My favorite Arhimedes heat ray experiment

I recently came across this video of a recreation of the Archimedes heat ray experiment.
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Old-fashioned.  Now out of date?: Solar cells have been around for decades, but with low-efficiency and high manufacturing costs, they have yet to be adapted into our everyday life.  Could new interdisciplinary research by the University of Minnesota make solar power more efficient and affordable?
Old-fashioned. Now out of date?: Solar cells have been around for decades, but with low-efficiency and high manufacturing costs, they have yet to be adapted into our everyday life. Could new interdisciplinary research by the University of Minnesota make solar power more efficient and affordable?Courtesy Andrej Salov

This month University of Minnesota researchers have developed a technique to better capture solar energy using 'quantum dots,' a type of nanoparticle. Researcher William Tisdale said, while

“This work is a necessary but not sufficient step for building very high-efficiency solar cells. It provides a motivation for researchers to work on quantum dots and solar cells based on quantum dots.”

The technology could improve solar energy efficiency from 30 to 66 percent! That's incredible. Furthermore, the improvements may also cut manufacturing costs (and carbon footprints) by removing the need for high temperature processing. The ramifications for nanotechnology and clean energy abound.

Jun
27
2010

Light enhances mood and well-being

Farnsworth House: Built in 1951 near Chicago by Ludwig Mies van der Rohe as a one room retreat for Dr. Edith Farnsworth. Purchased in 2003 for a reported $7.5 million, it is now operated as a house museum. The house is listed in the National Register and is designated a National Historic Landmark by the United States Department of the Interior.
Farnsworth House: Built in 1951 near Chicago by Ludwig Mies van der Rohe as a one room retreat for Dr. Edith Farnsworth. Purchased in 2003 for a reported $7.5 million, it is now operated as a house museum. The house is listed in the National Register and is designated a National Historic Landmark by the United States Department of the Interior.Courtesy Jack E Boucher
LUMEN means “the power of light". HAUS is a reference to the Bauhaus movement and architect Mies Van Der Rohe's Farnsworth House. Like the Farnsworth House, Lumenhaus can open up to maximize its occupants’ exposure to natural daylight.

Lumenhaus could win the Solar Decathlon Europe competition

Lumenhaus, designed by Virginia Tech, has a good chance of winning the Solar Decathlon Europe 2010 competition which ends today.

Virginia Tech had a commanding 35-point lead at Solar Decathlon Europe earlier this week, but the University of Applied Sciences Rosenheim has cut that lead to only six points now. ...everything the teams do—from hot water draws to cooking to washing to cooling their houses—really makes a difference. Every point counts. SolarDecathlon.gov blog

There is an app for that

Lumenhaus is a zero-energy home that is completely powered by the sun. Using technology, Lumenhaus' automated systems make the owner’s life simpler, more energy efficient and less expensive. An iPhone app allows its users to monitor everything real time and to even override controls. I would really like to live in a house like this.

Watch this Lumenhaus Youtube video

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Learn more about Lumenhaus

  • Lumenhaus website
  • Inhabitat.com coverage of Lumenhaus
  • Jun
    13
    2010

    Another Solar Decathlon competition is happening, this time in Europe. The Solar Decathlon Europe 2010 is a competition between 20 college and university student teams to design and build the best solar home. The houses must use readily available products and be easy to transport and assemble.

    I would really enjoy designing and living in such a house of my own. Watching teams of experts compete to design innovative, efficient, and sustainable housing is a great place to get ideas.

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    Picking the winner

    SDEurope.org has a 17 page PDF download which explains how a maximum 1000 points can be earned in the 10 categories.

    On the one hand, the competition will include objective methods for scoring, which will include measurable parameters such as the actual energy consumption of the houses, the capacity for solar energy capture, etc., as well as tasks performed by decathletes which reproduce domestic activities.
    In addition, a number of evaluations will be made by a panel of jurors with proven experience who will judge qualities such as: architecture, innovation, sustainability, solar systems, communication and industrialization level.
    The final score given to each team will be made up of a balanced combination of both objective and subjective assessments.

    Related Solar Decathlon Buzz links

    There's a lot of work being done at the nanoscale to find a cheap source of green energy. Will Pokeberries be the final material needed for a solution?

    http://www.nanowerk.com/news/newsid=15962.php
    Pokeberries ripening: Pokeberries may provide a key to cheap solar energy.
    Pokeberries ripening: Pokeberries may provide a key to cheap solar energy.Courtesy Huwmanbeing

    Solar Impulse makes maiden voyage

    As the sun shone down on the Swiss countryside an aircraft powered by 12,000 solar cells flew for 87 minutes to an altitude of nearly 4,000 feet. Learn more here: Wired

    Feb
    21
    2010

    Solar cells made from common materials

    Solar cells for everyone
    Solar cells for everyoneCourtesy Dominic

    Solar cells produce less than 1/1000 of the Earth's electricity. This is mainly because they are expensive and are made from rare, hard to obtain materials.
    An IBM research team, managed by David Mitzi, is working on photovoltaic cells that are made from common materials.

    The new solar cells are also cheaper to manufacture, using a “printing” technique that uses a hydrazine solution containing copper and tin with nanoparticles of zinc dispersed within it. The solution is then spin-coated and heat treated in the presence of selenium or sulfur vapor. PhysOrg

    9.6% Efficiency

    This new material, called kesterite, was 6.8% efficient in 2009. IBM increased the efficiency to 9.8% and is planning to increase the efficiency above 11 per cent, which is equal to or better than the traditional solar cells.

    Abstract of published paper: High-Efficiency Solar Cell with Earth-Abundant Liquid-Processed Absorber Advanced Materials

    Oct
    12
    2009

    ICON Univ of MN Solar Decathlon enty: crane lowers a section of roof onto the University of Minnesota's Icon House, which arrived on the Mall Oct. 2. The house arrived several days late because of transport difficulties.
    ICON Univ of MN Solar Decathlon enty: crane lowers a section of roof onto the University of Minnesota's Icon House, which arrived on the Mall Oct. 2. The house arrived several days late because of transport difficulties.Courtesy Richard King/U.S. Department of Energy

    20 Solar houses compete in fourth Solar Decathlon

    I hope to one day live in a house that produces more energy than it uses. A competition between 20 such houses is going on right now on the Mall in Washington DC. The Solar Decathlon joins 20 college and university teams in a competition to design, build, and operate the most attractive and energy-efficient solar-powered house. Points awarded in ten categories determine the overall winner. As of today (Mon) we have climbed up to 7th place(click for most recent rankings).

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    Lots of ways to learn about solar housing design

    I have been excitedly working my way through information as it comes in. You can follow a umn_solar_house Twitter feed and there is an ICON Facebook fan page. The Solar Decathalon landing page allows you to jump to photos, videos, and team websites(not working? Try the site map). The University of Minnesota's ICON landing page branches off into a blog, a virtual tour, and lots of educational pages about design. The media (WCCO News and Washington Post) and bloggers (myself included) will be all over this. I recommend GetEnergySmartNow.com's cheat sheet and their overview of the UMN ICON house. You can also download a 966KB PDF media kit about the Solar Decathlon.

    Jul
    19
    2009

    Two cylinder Stirling engine: Alpha type Stirling engine. The expansion cylinder (red) is maintained at a high temperature while the compression cylinder (blue) is cooled. The passage between the two cylinders contains the regenerator.
    Two cylinder Stirling engine: Alpha type Stirling engine. The expansion cylinder (red) is maintained at a high temperature while the compression cylinder (blue) is cooled. The passage between the two cylinders contains the regenerator.Courtesy Zephyris
    Four newly designed solar power collection dishes called SunCatchers™ were unveiled at Sandia's National Solar Thermal Test Facility. The new dishes are the next-generation model of the original SunCatcher system. Designed for high-volume production, ease of maintenance, and cost reductions, the dishes could be in commercial service by 2010. The projects are expected to produce 1,000 MW by the end of 2012. One megawatt powers about 800 homes.

    Better and cheaper solar conversion

    SunCatcher™ power system
    SunCatcher™ power systemCourtesy Randy Montoya
    Last year one of the original SunCatchers set a new solar-to-grid system conversion efficiency record by achieving a 31.25 percent net efficiency rate, toppling the old 1984 record of 29.4.

    Source: New SunCatcher™ power system unveiled at National Solar Thermal Test Facility, Sandia News release.