The new Blue Ridge Parkway Destination Center has just been completed in North Carolina. It’s a beautifully designed building that is also highly efficient — it will use 75% less energy than a comparable conventional building. The building has Trombe walls: a very clever feature that will reduce the building’s heating load by 35% alone! Read more →

Several readers have noted that we neglected to mention the Strida folding bike in our folding bike round-up. The Strida is a unique bike designed to take a commuter a few miles to the train or bus. It has an extremely quick folding action: it takes about seven seconds to fold one up. Here’s a video of the folding action: Read more →

When researching energy efficient appliances, we often turn to the recommendations of the American Council for an Energy-Efficient Economy (ACEEE). The ACEEE continues to publish helpful information about all sorts of appliances, including freezers. The ninth edition of their Consumer Guide to Home Energy Savings, published in fall 2007, contains helpful information about selecting a freezer.

The most efficient type of freezer is the chest freezer. This is due to the fact that cold air is heavier than warm air, and it does not escape as easily from chest freezers that open from the top. The weight of the lid also helps to seal chest freezers tightly. Chest freezers are 10% to 25% more efficient than upright freezers. Read more →

I’ve been testing the Vers 2x iPod speaker system. This system is one of the most energy efficient and sustainable products I’ve come across. The casing is crafted out of wood (either cherry, bamboo or walnut). The wood comes only from plantation forests, and each speaker system is hand-finished. This is a refreshing change from the usual dull plastic that is used to house electronics.

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MIT researchers have announced that they have created “organic solar concentrators” that could make windows become powerful solar panels in as little as three years. The concentrator is mixture of two or more dyes painted onto a pane of glass or plastic. The dyes absorb light across a range of wavelengths, re-emit it at a different wavelength and transport it across the pane to the solar cells at the edges. Focusing the light like this increases the electrical power generated by each solar cell by a factor of 40. Read more →

Our buildings and homes could capture all water we need on a daily basis. A great example of rainwater harvesting can be found at the Langston Brown Community Center and High School in Arlington, Virginia. The community center has two 24-foot-tall 11,000-gallon cisterns that store rainwater. Read more →

^{A Fagor Duo Pressure Cooker}

Pressure cookers are efficient cooking devices –  they are up to 70% more efficient than conventional pots. Their lids are built to completely seal the pot so that the contents can boil easily inside the pot. Food cooks faster because the liquid inside rises to a higher temperature before boiling. Cooking times can be reduced by a factor of three or four. Choose a stainless steel pressure cooker instead of aluminum one because the stainless steel does not interact with the food. Read more →

I receive a lot of email from people asking about solar chargers. I haven’t reviewed them previously because they generally only useful if you are going to very remote locations. Portable solar chargers tend to be pricey and they can take a while to get things charged. The best portable charge are flexible, thin-film solar cells. These cells can be folded and packed away easily.

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We briefly reviewed battery chargers in a previous post “The Best Rechargeable Batteries of 2008“. Here’s a closer look at the best universal battery chargers, or chargers that can handle AAA, AA, C, D sized cells, and well as 9V cells. Read more →

I recently noted that Hawaii has enacted a law that requires all new homes to install solar water heaters. Eventually, Hawaii may have as many water heaters as Israel, where 90% of homes have solar water heaters installed. When viewed from above, the Jerusalem often glitters with the shine of the thousands of solar heaters that adorn rooftops. Read more →

Electric fans are the most efficient cooling devices. Fans use far less power than air conditioners (see our recent review of the most efficient portable fan). But in hot and humid weather, air conditioning is a great relief. Cooling an entire house uses a lot of energy — it’s much more efficient to only cool the areas where you are sleeping or working, by using a portable air conditioner. Read more →

Hawaii has become the first state to require solar water heaters in new homes. The bill was signed into law by Governor Linda Lingle, a Republican. It requires the energy-saving systems in homes starting in 2010. It prohibits issuing building permits for single-family homes that do not have solar water heaters. Hawaii relies on imported fossil fuels more than any other state, with about 90 percent of its energy sources coming from foreign countries, according to state data. Read more →

Koncept has released a new series of their I-Tower LED floor lamps. It’s good LED floor lamps becoming widely available. These lamps use the latest generation of high-power LEDs, which means they are brighter than the older I-Tower lamps, but they actually uses less power (8.8 watts). There are two models: a daylight version (~5500 Kelvin) and a warm-white version (~3500 Kelvin). The lamps have a built-in 4 step dimmer. Koncept says the lifespan of these lamps is “at least 40,000 operating hours”. They are available from Amazon for $195.

Folding bikes are particularly efficient when used in conjunction with public transit. Unlike regular bikes, they can be taken easily on buses, trains or ferries. In fact, some transit systems will only allow folding bikes to be taken on board. I recently reviewed the Best Folding Bikes of 2008. An efficient addition to these bikes is an electric motor. For a little extra weight, you get the benefit of going up hills easily, and this is often very important to commuters who do not work up a sweat before getting into work. Let’s take a look at one of the better folding electric bikes out there: a Dahon Mu P3 custom-fitted with a BionX electric assist motor. Read more →

Solar energy is often used to heat water or generate electricity, but it can also be used to heat air. The SolarDuct is a new device that uses sunlight to heat air before it enter a ventilator. They are modular units that can be installed on buildings with flat roofs. Read more →

A trailerbike is a one-wheeled bike extension that attaches to the back of your bike. They are an efficient way to bring your child on a longer bike ride. Your smaller companion can assist you with pedaling, while you control the steering and speed. This allows your child to become familiar with the process of riding a bike, and they can relax if they feel tired. The original trailerbikes were introduced into the market by the Adams company in 1986. They were marketed under the name “trail-a-bike”, and this is now their trademarked term. Most trailerbikes also include adjustable handlebars and seats that accommodate a growing child. See a our roundup of trailerbikes on Optimal Ride.

The Geobulb is a 8 watt LED light that replaces a 60 watt incandescent bulb. It generates 800 lumens of light to be exact — either warm white light or cool white. This bulb has a sleeker design than some of the LED lights I’ve seen — check out that aesthetically pleasing heat sink. Read more →

In a city with few green spaces, Namba Parks is a welcome swath of green for the inhabitants of Osaka. Check out this full size photo of this amazing piece of architecture. The complex stands where Osaka’s baseball stadium used to be until 2003, and consists of a 30-floor skyscraper, Parks Tower, and a shopping mall with eight floors of terraced gardens. The sloping park connects to the street, welcoming passers-by to enjoy its groves of trees, clusters of rocks, cliffs, lawn, streams, waterfalls, ponds and outdoor terraces.

I’ve been testing the Tri-L LED light by Altus Lumen. I have to admit that this light has become one of my favorite gadgets. The design of the Tri-L shows great attention to detail. The metal housing is made out of 85% recycled magnesium which is lighter than aluminum, so the Tri-L feels solid yet light in your hand. When folded up, the light acts as a flashlight, and measures just 110×60x20mm, so it fits nicely in a pocket. When unfolded, the light becomes its own 360 degree tripod stand, and can be used as a serious worklight or booklight.

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This portable fan, the Seabreeze Turbo Aire, has an aerodynamic design inspired by a jet engine. It produces a high velocity airstream through an optimized blade shape and orientation. The manufacturer claims it moves three times as much air as a comparable fan, while operating quietly. On a low setting, the Turbo Aire consumes just 65 watts, and on a high setting it uses about 110 watts. Read more →