Friday, August 15, 2008

Xeriscape, the Art of Water Conserving Landscaping

As climate patterns shift, xeriscaping is catching on in other areas and has been very popular here in Spain for the last few years. The term itself derives from the Greek word ‘xeros’, meaning dry, and the word ‘landscape’.

The idea behind Xeriscapes is to create gardens with a rational water use, to avoid any waste of water, especially in Mediterranean and warm temperate climates. Saving water however is not the only objective of Xeriscaping. It also intends to eliminate the amount of chemical fertilizers and pesticides as well as petrol-driven machinery to keep the garden in shape. Plus is saves you money and maintenance.

How does it work? When designing the landscape, plants whose natural requirements are appropriate to the local climate should be chosen. They don’t necessary have to be all local plants, but they should originate from the same climate. Furthermore, water loss through evaporation and run-off should be avoided.

Examples for common plants used in Western xeriscaping are agave, cactus, lavender, juniper, sedum and thyme, according to Wikipedia.

Xeriscape, the Art of Water Conserving Landscaping

Lumeta Makes Peel-and-Stick Solar Panel

Solar rooftop installations just got a lot easier: Lumeta, a subsidiary of construction heavyweight DRI, has developed a solar panel sticker -- the Power-Ply 380. The company says its convenient peel-and-stick solar technology allows it to be installed almost twice as fast as regular rack-mounted panels -- a claim put to the test in the above video.

The panels are half as heavy as concrete roofing tiles and can be tailored to fit on most tile designs -- concrete, clay, profile and flat (added bonus: they come in a variety of colors). As Wired Science's Alexis Madrigal notes, the Power-Ply's main downside is that it loses the sun's optimal angle, thus making the peel-and-stick panels less efficient than some of its alternatives.

That energy loss amounts to around 5% of the panels' power production. According to its promotional datasheet, its panels can each produce 380 Wp of power under peak performance conditions. Lumeta is hoping to ride on a wave of growing consumer interest in solar panels -- particularly new homeowners looking to invest in energy-efficient technologies for the long run.

Lumeta Makes Peel-and-Stick Solar Panel Installations a Breeze : TreeHugger

Electric bikes selling briskly as gas prices climb

The surging cost of gasoline and a desire for a greener commute are turning more people to electric bikes as an unconventional form of transportation. They function like a typical two-wheeler but with a battery-powered assist, and bike dealers, riders and experts say they are flying off the racks.

Official sales figures are hard to pin down, but the Gluskin-Townley Group, which does market research for the National Bicycle Dealers Association, estimates 10,000 electric bikes were sold in the U.S. in 2007, up from 6,000 in 2006.

Bert Cebular, who owns the electric bike and scooter dealership NYCeWheels in New York, said his sales are up about 50 percent so far this year over last. Amazon.com Inc. says sales of electric bikes surged more than 6,000 percent in July from a year earlier, in part because of its expanded offerings.

"The electric bikes are the next big thing," said Frank Jamerson, a former General Motors Corp. executive turned electric vehicle guru.

They're even more popular in Europe, where Sophie Nenner, who opened a Paris bike store in 2005, says motorists boxed in by traffic jams are looking for an alternative for short journeys that doesn't involve navigating overcrowded transport systems.

Industry associations estimate 89,000 electric bikes were sold in the Netherlands last year, while 60,000 power-assisted bikes were sold in Germany.

The principle behind electric bikes is akin to that behind hybrid cars: Combine the conventional technology — in this case, old-fashioned pedaling — with a battery-powered motor.

The net result is a vehicle that rides a bit like a scooter, with some legwork required. Most models have a motorcycle-like throttle that gives a boost while going up hills or accelerating from a stop. On some models, the motor kicks in automatically and adjusts its torque based on how hard the rider pedals.

Although regulations vary by state, federal law classifies electric bikes as bicycles, and no license or registration is required as long as they don't go faster than 20 mph and their power doesn't exceed 750 watts.

Electric bikes selling briskly as gas prices climb - Yahoo! News

Monday, June 2, 2008

10 Ways to Green your Fridge

Some good tips from Vegetarian Times

Remember as a child when your father yelled, “Close the door!” as you stood in front of the fridge, pondering what to eat? Well, he was right: The refrigerator consumes more energy than any other household appliance. According to the Union of Concerned Scientists, the average American fridge uses around 1,383 kilowatt hours a year, which is 14 percent of your household’s electrical needs and about $90 a year. But there are simple steps you can take to lighten your refrigerator’s impact on your wallet—and the environment. More importantly, many of these changes—some large and some small—can cut down on the chemicals and bacteria lingering in your fridge, which is healthier for everyone in the house.

1. DITCH THE PLASTIC
Plastic containers may be a kitchen staple, but there are some great reasons to switch to glass storage for your leftovers. Glass keeps food and beverages colder, which means less work for the fridge. Glass is an all-natural, recyclable material, while many plastics are not. And with the potential health hazards associated with leaching plastic, glass containers are a smart alternative because they can go from fridge to microwave to table without having to transfer and generate additional dirty dishes. Finally, when it comes to avoiding spoilage—which is both a waste and a health issue— glass is the clear winner. “Using transparent containers instead of opaque ones is more likely to get leftovers noticed and eaten in a timely manner,” says Kirsten Ritchie, director of sustainable design at Gensler Corporation in San Francisco.

2. UPGRADE (AND DOWNSIZE)
By replacing a fridge bought in 1990 with an Energy Star–qualifi ed model, you could save enough energy to light a household for nearly four months, according to the U.S. Department of Energy (DOE). To fi nd a list of Energy Star–approved models, log on to energystar.gov. When you’re out shopping, look for the yellow U.S. Energy Guide sticker, which rates models for effi ciency. Keep in mind that units with the freezer on top perform 10 percent to 25 percent more effi ciently than side-by-side models. Also, consider buying a smaller model that consumes less energy and discourages waste, says Alicia Silva, an interior designer at Synergy Design Studio, a Seattle-based company specializing in green building. “With a smaller fridge, you realize you can only save what you are going to eat,” she adds. When you’re ready to switch out your old fridge, call your local recycling center to ask about proper disposal.

3. FORGET ICE AND WATER DISPENSERS
Automatic ice makers and through-the-door ice and water dispensers increase your unit’s energy use by 14 percent to 20 percent and raise the price of a new refrigerator by $75 to $250, according to the DOE. Skip these features and keep fully stocked ice trays, and use a pitcher-style fi lter to keep drinking water clean and chilled. If you just can’t live without an automatic ice maker, make it the internal variety, advises Ritchie.

4. FILL ’ER UP
A full refrigerator uses less energy than an empty one: The more space to cool, the harder the fridge has to work. However, Ritchie warns, “You don’t want it too full because you still need room for the chilled air to circulate and cool down new items.” If you live alone and often have bare shelves, the California Energy Commission recommends fi lling the extra space with water-fi lled containers (plus you’ll have water on hand in case of an emergency).

5. MIND THE (EXPIRATION) DATE
Tara Gidus, MS, RD, a spokesperson for the American Dietetic Association, warns that most people keep foods much longer than they should. “Check labels for dates and throw out anything that is past expiration,” says Gidus. Better yet, get expiration-date savvy, and use up your groceries before they have a chance to expire. A “sell-by” date tells grocers when to pull a product off store shelves; as a consumer, you have a few days past this date to use a product. A “use-by” date means exactly that: Use by that date, or toss the food. (For more guidance on the shelf life of common perishables, see “Is It Safe to Eat?,” right.) In general, leftovers should not be kept longer than three or four days.
6. KEEP IT CLEAN … NATURALLY
Even the tiniest spills can lead to bacterial growth, which speeds up food spoilage—and waste. Yet conventional cleaning products introduce toxic chemicals into your food zone. Instead, Gidus suggests these simple, homemade formulas for effective natural cleaning: For a quick wipe down of shelves, use mild liquid soap or a one-toone solution of white vinegar and water; for sticky spills that require gentle scouring, use baking soda and a damp sponge.

7. VACUUM THE COILS
The refrigerator coils, located both behind and underneath the fridge, are at the heart of the unit’s refrigerant system. They are also natural dust magnets: A cooling agent passes through the coils, and a fan blows across them, stirring up and attracting dust. The more dust, the less effi cient the fan is at removing heat. Twice a year, use a vacuum cleaner with a long brush attachment to clean thoroughly around the coils.

8. CHECK THE SEALS
While you’re examining the exterior of the fridge, make sure the seals on the doors are tight. Place a dollar bill in the refrigerator door and close it. If you can easily pull out the dollar bill, the door needs to be adjusted or you may need to replace the rubber seal. Also, be sure to wipe down the seals regularly to prevent dust and grime buildup, which can interfere with the seals and, over time, lead to brittleness.

9. LOCATION, LOCATION, LOCATION
If your refrigerator is sitting next to the stove or a sunny window, consider moving the fridge to a different spot. For each degree above 70°F surrounding the fridge, the unit uses 2.5 percent more power to keep its contents cool. Moving a fridge out of a potentially 90°F spot could save you up to $70 a year. The best location is against a north or east wall, says Ritchie.

10. TAKE YOUR TEMPERATURE
The optimal temperature range in the refrigerator is 36°–38°F (in the freezer, it should be 0°F). But, for every degree below 38°F, the unit consumes 5 percent more energy. Because a built-in thermometer might not tell you the whole story, purchase a refrigerator thermometer, leave it in an easy-to-see spot, and check it periodically. Move the thermometer around in the refrigerator to determine which spots are coldest, and use this information to help guide storage decisions. For instance, spoilage-sensitive eggs generally should not be stored in the door, which tends to be a few degrees warmer than interior shelves.

Thursday, May 22, 2008

Students in Punjab, India, build a 250 km per litre 'wonder car'

Imagine doing a 250-km journey... in just one-litre of petrol (just over $1)!

That's exactly what students of a technical institute in Punjab - the Rayat Institute of Engineering and Information Technology near Ropar, 50 km from here - claim to have developed.

"It is a rare solo car which can generate a mileage of up to 250 km per litre. Our team of students have not only achieved this feat, but are going to showcase it at a world super-mileage competition in the United States next month," Gurvinder Singh Bahra, vice chairman of the Rayat and Bahra group of institutes, told media persons here as he unveiled the 'wonder car' with the team.

Though the students' team claims that the car will cost Rs.500,000, its research and development cost over Rs.2.13 million to the institute.

The car, having a 92cc engine, has been developed by a seven-member team of students from the sixth semester of the institute's mechanical engineering course. The team is led by Gaurav Aggarwal as captain and other members are Mayank Tyagi, Bhavuk Makkar, Arun Salaria, Rahul Kumar, Ramandeep Singh and Navneet Kumar. The team had Jujhar Singh and Rajesh Chaudhary as faculty advisors.

It took them one year to develop the car, said Bahra.