Solar Cells Get to 20% Conversion Efficiency

I am becoming a big fan of solar power as it begins the long march toward parity with current power supplies — I would love to get off the Commonwealth Edison grid and not have to pay that big electricity bill every month.

So I was excited to see today that Suniva Inc. announced that its R&D team has developed several silicon solar cells in its lab with more than 20% conversion efficiencies using its patented combination of cell designs and screen printing technologies.

“Our R&D team already has a solid roadmap in place to further increase our efficiencies. We are excited about Suniva’s continued momentum on the path to make solar electricity cost-competitive with conventional grid electricity.” — Dr. Ajeet Rohatgi, Founder and CTO, Suniva

These high efficiency milestones have been verified by the National Renewable Energy Laboratory (NREL). The efficiency achievement closely follows Suniva’s two recent customer agreements with Germany’s Solon AG and India’s Titan Energy Systems Ltd, together worth approximately US $1 billion. “This demonstrates that Suniva’s advanced technologies in diffusion, surface passivation and contacts can increase conversion efficiency while reducing processing time and maintaining low cell cost,” said Dr. Ajeet Rohatgi, Suniva’s founder and CTO. “Our R&D team already has a solid roadmap in place to further increase our efficiencies. We are excited about Suniva’s continued momentum on the path to make solar electricity cost-competitive with conventional grid electricity.”


Solar as Alternative?

I am beginning to look into solar options but I live in Illinois (never really known as the land of the uninterrupted sun) so I wanted to find out how to calculate whether an investment in solar makes sense in Chicago.  I learned that the total solar energy available to the earth is approximately 3850 zettajoules (ZJ) per year, while worldwide energy consumption was 0.471 ZJ in 2004, according to the US Department of Energy. Even if you aren’t a solar panel installer, you can tell that there’s way more solar energy available than the world will ever need.

Doing my homework, I found FindSolar.com, a Web site sponsored by the U.S. Department of Energy, the American Solar Energy Society, and the Solar Electric Power Association.

solarcells.jpg

To get started, select your state and county, power company, and the type of system you’re interested in-whether it’s electric, hot water, spa/pool heating, or space heating/cooling-as well as your average utility expenditure. The online calculator then determines the average cost of a solar-electric system based on the data you’ve provided, plus any state or local rebates you qualify for. If you’re ready to start pumping out those rays, you can contact solar installers and distributors in the site’s directory for quotes or additional info.

Global…..Cooling?

This past April, the USA had an average temperature of 51 degrees, which was one of the coolest in the last 114 years — where is the global warming? Look at the data here.

Which Choice Do You Make? Food or Fuel?

Look at this article and then reflect on which choice you would make — it is obvious what choice Al Gore would make but what would you do if you were the country’s policymaker?

NEW YORK SUN – The campaign against climate change could be set back by the global food crisis, as foreign populations turn against measures to use foodstuffs as substitutes for fossil fuels. With prices for rice, wheat, and corn soaring, food-related unrest has broken out in places such as Haiti, Indonesia, and Afghanistan. Several countries have blocked the export of grain. There is even talk that governments could fall if they cannot bring food costs down.

One factor being blamed for the price hikes is the use of government subsidies to promote the use of corn for ethanol production. An estimated 30% of America’s corn crop now goes to fuel, not food. “I don’t think anybody knows precisely how much ethanol contributes to the run-up in food prices, but the contribution is clearly substantial,” a professor of applied economics and law at the University of Minnesota, C. Ford Runge, said. A study by a Washington think tank, the International Food Policy Research Institute, indicated that between a quarter and a third of the recent hike in commodities prices is attributable to biofuels. Last year, Mr. Runge and a colleague, Benjamin Senauer, wrote an article in Foreign Affairs, “How Biofuels Could Starve the Poor.” “We were criticized for being alarmist at the time,” Mr. Runge said. “I think our views, looking back a year, were probably too conservative.” Ethanol was initially promoted as a vehicle for America to cut back on foreign oil. In recent years, biofuels have also been touted as a way to fight climate change, but the food crisis does not augur well for ethanol’s prospects.

“It takes around 400 pounds of corn to make 25 gallons of ethanol,” Mr. Senauer, also an applied economics professor at Minnesota, said. “It’s not going to be a very good diet but that’s roughly enough to keep an adult person alive for a year.” Mr. Senauer said climate change advocates, such as Vice President Gore, need to distance themselves from ethanol to avoid tarnishing the effort against global warming. “Crop-based biofuels are not part of the solution. They, in fact, add to the problem. Whether Al Gore has caught up with that, somebody ought to ask him,” the professor said. “There are lots of solutions, real solutions to climate change. We need to get to those.” Mr. Gore was not available for an interview yesterday on the food crisis, according to his spokeswoman. A spokesman for Mr. Gore’s public campaign to address climate change, the Alliance for Climate Protection, declined to comment for this article. [Read more...]

Chicago 33rd Most Affordable Metro Area

A new study by Bizjournals.com, a group of business publications, ranked housing affordability in the nation’s metropolitan areas, with terse advice for those seeking a financially manageable place to live: ABC —-That is, Anywhere But California.

Bizjournals compared median home payments and household income levels in the nation’s 50 largest metros. The study was based on statistics from the U.S. Census Bureau’s 2006 American Community Survey, the most up-to-date source of federal data on housing costs. The study, to no one’s particular surprise, concluded that six of the seven most expensive places for housing are in the Golden State. Others on the list of America’s 10 most expensive home markets are New York City, Sacramento, Miami-Fort Lauderdale and Boston.

The study compared median home payments, property taxes and household income in 50 metros. Los Angeles was most expensive: The magazines estimated the monthly housing tab in L.A. amounts to about 75.5 percent of the median household income, with a median monthly mortgage-and-tax payment of $3,491.

Compare that to the most affordable metro, Oklahoma City. There, housing eats up just 19 percent of the median household income, the magazines said. The median monthly bill for mortgage and taxes is $667.

Chicago ranks as the 33rd most affordable metro, ahead of such cities as Portland OR (37th),Seattle, (40th), Boston (42nd), NYC (46th) and San Francisco (49th). In Chicago, where the aforementioned housing charges consume about 35 percent of our income, the study said. It pegged the median mortgage payment here at $1,358; add to that a median monthly property tax of $309, and your basic home-owning Chicagoan gets a monthly mortgage payment of $1,667.

The complete rankings are at www.bizjournals.com; go to “Online Edition” and click “Special Reports.”

Bike Share in Chicago?

City commuters weary of stuffy journeys aboard buses and subways now have a better way to get to work, buy groceries and meet for a Saturday matinee. The bike-sharing programs that have transformed Europeans into two-wheeled travelers are now en route to the U.S.

Clear Channel Outdoor, an outdoor advertising company, will launch the country’s first bike-share service in Washington, D.C., in mid-May in partnership with the district’s Department of Transportation.

SmartBike DC will initially offer annual subscribers access to 100 bikes at 10 stations in the city’s central business district. Located at key locations in the central business district, the bicycles provide a new way of discovering and moving around the city. The bike stations are modular and the bicycles are ergonomic and light-weight in a distinct design.

Bicycles are parked at docking points which use a proprietary locking system to ensure that each bicycle is securely stored. The service is accessible via online subscription. Subscribers will receive a personalized SmartBike DC user card that provides access to any station of the program at any time. The turnkey program includes fulltime operational service. Clear Channel’s operational team manages the rotation of bicycles for each station to assure a proper ratio between available bicycles as well as drop-off locations.

Other cities, including San Francisco and Chicago, are eager to follow suit. Learn More


Chicago Ranks 9th as Green City

Popular Science recently reported its top 50 greenest cities, where Chicago ranked a strong ninth in the country. In their ranking, the key variables analyzed were:

  • Electricity (E; 10 points): Cities score points for drawing their energy from renewable sources such as wind, solar, biomass and hydroelectric power, as well as for offering incentives for residents to invest in their own power sources, like roof-mounted solar panels.
  • Transportation (T; 10 points): High scores go to cities whose commuters take public transportation or carpool. Air quality also plays a role.
  • Green living (G; 5 points): Cities earn points for the number of buildings certified by the U.S. Green Building Council, as well as for devoting area to green space, such as public parks and nature preserves.
  • Recycling and green perspective (R; 5 points): This measures how comprehensive a city’s recycling program is (if the city collects old electronics, for example) and how important its citizens consider environmental issues.

Here are the leaders:

1. Portland, Ore. 23.1

  • Electricity: 7.1 Transportation: 6.4 Green Living: 4.8 Recycling/Perspective: 4.8

America’s top green city has it all: Half its power comes from renewable sources, a quarter of the workforce commutes by bike, carpool or public [Read more...]

The First Mobile Hotel Room

Fan attending any of the big festivals this summer might wish they have access to one of these – the “world’s first mobile hotel room”. The Travelodge hotel chain recently announced that its Travelpod would soon be available at events such as music festivals and sporting competitions. Designed to be set up anywhere you might put up a tent, it’s cheering news for anyone who books into B&Bs at music festivals or panics about camping holidays.

Travel Pod

The pod is sealed in a polycarbonate glass box, but includes features offered in conventional hotel rooms such as TV and air conditioning. Leigh McCarron, Travelodge’s director of sleep, called it “a ground-breaker in outdoor accommodation”. The Travelpod, which measures 6 metres by 2.4, includes a double bed, bedside lights, carpeted floors, and dressing table – plus blinds. A spokeswoman for Travelodge said: “The Travelpod is a ground-breaker in outdoor accommodation.” She added, “With the popularity of outdoor sleeping we saw a definite niche in the market for something a bit more up-market”. When asked who will be hiring this glamorous answer to a tent, she replied “One woman wanted 20 of them for the guests at her garden wedding to sleep in.”

The Sustainable House

I am a big fan of using the sun and wind as energy sources rather than paying the local utility, and working to create a sustainable house. I love to imagine what one of these “energy-free” houses would be like and I think I found one in Enertia. I saw them tonight on the Science Channel.

In the Enertia Building System, solid Energy-Engineered wood walls replace siding, framing, insulation, and paneling. An air flow and access channel, or Envelope, runs around the building, just inside the walls – creating a miniature biosphere. Here solar heated air circulates, pumping and boosting geothermal energy from beneath the house, storing it in the massive wood walls. Thermal inertia causes the house to “float” between the cycles of night and day, and even between the seasons.

Many aspects of the Enertia® House are unusual and innovative – but backed up by science, common-sense, and prototype homes across America. In fact, each aspect listed below increases the energy efficiency of the building. The effect is Synergistic – equal to more than the sum of the parts. The Enertia® House can make more energy than it uses!

What do you think? I love this idea. Could you do one of these in Chicago?