Posts Tagged ‘green power’

How much wind is enough wind?

Monday, August 31st, 2009

An evening walk with my wife revealed to me something about wind turbines. We were walking in a garden that happens to be set in a valley right below two large industrial turbines. I bet these have cut-in speeds of 20 mph (granted- I’m familiar with home, rather than wind turbines, but I’m sure they require a lot of wind). In addition, the two turbines are two different sizes. By swept area, I’d think that one is at least 1/3 bigger. This area also does not ever appear to be windy. I had often commented to my wife how odd I found it that such large turbines could function right there- it feels like the doldrums of a desert landscape

When I was out there last night, I noticed for the first time that the larger turbine wasn’t moving at all and the smaller one was barely moving. “Sort of figures, I thought.” It was a clear demonstration of a particular phenomenon to me- cut-in speed. This is the speed necessary to move a wind turbine. Clearly, the light breeze wasn’t doing it. It simply didn’t move fast enough to move the big turbine or to move the small one in any significant way.

But then something interesting happened. The Earth cooled, night fell, and the turbines started spinning. More interestingly, the larger turbine seemed to start moving slower than the small one, but as night progressed, began moving faster and faster till it seemed to be moving even faster than the small turbine. Despite their weight, the larger blades simply caught more air, making them move faster than the smaller blades.

This whole situation was a clear demonstration of something of which we all need to be aware. When choosing a wind power system, sizing, testing, and careful selection are all of utmost importance. If you live where I do, it’s probably best to either have a small turbine or a huge tower. It also showed me another principle, however. If you live in some of the places where I used to live (shores of Lake Michigan for example), you’d be well advised to buy a larger turbine. I noticed on this walk that when the wind picked up, the larger turbine picked up more wind and moved faster. Not only can it turn faster, it is probably turning a larger magnet. The net benefit is greater- but only if you have the kind of wind necessary to make it turn. Bare this in mind whenever you think about building your own home green power systems.

And as always- good luck building!

Damon Westchester is the editor of build-green-power.com.

Green Power Close to Home

Saturday, August 29th, 2009

When we hear about how thinking globally and acting locally, power is often not at the forefront of our minds. But perhaps it should be. The environmental impact of transporting electricity is easily as taxing on the world climate as transporting hard consumer goods can be. Transporting power creates a direct waste of that power, creating a larger carbon footprint.

An immediate question springs to mind, however. Isn’t all power produced at least somewhat locally? In short, it is. However, we have narrow down what we consider local. If your power is produced 100 miles away, that’s not terribly far in today’s world, but some of the electricity will be lost over that 100 miles. If the power is produced on your roof or in your backyard, none of it will be lost (or at least very little of it).

For a moment, consider the factors at play in producing power. First, one has to consider the source of the power (i.e. coal, solar, wind, etc.), then where it’s made (in a plant, in your backyard, etc.), then how far it has to travel (NY to CA or from the source to your breaker box). Something we often don’t realize is that electricity does not travel well. While our technologies for creating power have advanced rapidly, our technologies for transporting and storing power have not. Some new developments, such as hydrogen fuel cells, have promise, but the kinks are not all worked out yet.

To truly create green power, that power needs to be created close to home. There is a set of factors at play: 1. This will rely on a local resource (i.e. creating solar power in Phoenix rather than Seattle); 2. This will require little transport, and therefore less degradation of the power; 3. Ultimately, less power will have to be created for the same outcome.

As it becomes easier and easier to build solar cells and wind turbines (not to mention micro-hydro systems) at home, it is worth considering ones environmental impact. The benefits are numerous- it save the environment, saves your power bills, and could even make you money (think tax breaks or even selling power back to the power company). Numerous resources are available to the home builder of green power, allowing it to be used in many different environments (rural, urban, suburban). Between the guides available today, the necessity of saving the climate, the potential financial savings, and the long-term satisfaction of building green power, building your own home power system is more attractive than ever.

Damon Westchester is the editor of www.build-green-power.com.

Green Power Close to Home

Thursday, August 27th, 2009

When we hear about how thinking globally and acting locally, power is often not at the forefront of our minds. But perhaps it should be. The environmental impact of transporting electricity is easily as taxing on the world climate as transporting hard consumer goods can be. Transporting power creates a direct waste of that power, creating a larger carbon footprint.
One might argue that all power is produced locally. Californians aren’t getting their power from New York. However, this is largely out of necessity. Making power a local endeavor can be taken much further.

There are a set of factors at play here, primarily technological. While our technologies for producing power have advanced, our technologies for moving that power have not advanced- or least they haven’t advanced much. There are some promising technological advances on the horizon, but they have not yet come to fruition. Thus, in short, every mile that electricity has to travel is a mile in which the amount of electricity will degrade. By the time all is said and done, you may be left with 80% of the power you created, leaving 20% as waste.

To truly create green power, that power needs to be created close to home. There is a set of factors at play: 1. This will rely on a local resource (i.e. creating solar power in Phoenix rather than Seattle); 2. This will require little transport, and therefore less degradation of the power; 3. Ultimately, less power will have to be created for the same outcome.

Today it is easier than ever to build green power at your own home. Systems have been created that can be deployed in any number of environments, urban, rural, or suburban. You don’t even need much land today to make some of your power from natural sources, and there are numerous guides to assist you in the process. Thus, thinking globally and acting locally is a tenet that we should absolutely be applying to our power systems. Even a polluting plant in your own backyard would end up requiring you to use less energy than the same polluting plant 100 miles away- and you could sell extra power to the utility company. Thus, building your own green power is a goal that you can take as an environmental goal, a conservation goal, and even an economic goal. I would strongly encourage everyone to at least consider the possibilty of building green power in your own home.

Damon Westchester is the editor of www.build-green-power.com.

Green Power Options - Which is Best?

Thursday, July 30th, 2009

Everybody wants green energy. Our obvious goal is to find the best way to be able to get the power we need without damaging the environment? Should we be opting for wind farms, hydroelectricity, or solar energy as alternative power? This guide to green living will help us decide

Renewable energy comes from resources that cannot be depleted which is why they are renewable. These resources are safe for our environment and produce energy without the harmful pollutants and emissions associated with fossil-fuels.

Wind farms often receive a bad press, especially when they’re situated near homes or in popular hiking areas. They often spoil views, because they have to be placed in skylines for maximum efficiency and they make a lot of noise. Offshore wind farms are less problematic in this way and can take advantage of fierce sea winds, increasing their output, but they rely on a nation having a lot of suitable coastline.

While the Netherlands does very well with its wind farms, the US is, considering the comparative size of its population, at a distinct disadvantage. For the home-owner, small wind-powered generators are available, but they’re not very efficient and often result in complaints from neighbors.

Using the natural energy of rivers and tidal forces by hydroelectricity is a much more effective way of generating power. However, there are a limited number of suitable locations for hydroelectric generators, and often these are in areas which already provide fertile farmland, so a lot of people have to be displaced and lose their land in order for them to be built. The impact on local wildlife can also be damaging.

Solar power alone passes the test of truly being practical, easy to access and non-polluting at the same time. Even when it is frequently cloudy, modern solar panels can still work effectively. Once installed, they require little maintenance and don’t get in anyones way. The greenest way to generate the power we need, for these reasons, is to harness the power of the sun.