Sunday, August 27, 2006

Point of use electricity: By Dean Kamen.



I got this post and the accompanying image from TIME. I read the piece by RSS feed. So, I lost the link. You go there and search for it!

I'm really thrilled the first image in my blog just happen to be of Dean Kamen. You remember him? Yes, the inventor of Segway.

Though, you may call him a little eccentric, I'm a kind of fan of Dean.

He had just invented a generator, the details of which I extracted from Time below. But the interesting part is they are putting two of the generator in test run in Bangladesh.

I'll be very much thrilled if we can get a user review of the generators because Bangladesh is quite near to us.

On how his generator works...
My engine runs like your refrigerator runs. When's the last time you did some maintenance work on the compressor of your refrigerator? [The refrigerator] is a sealed system. You put electricity into that compressor, the bottom end gets hot and gets blown away, and the top end, because you've put electricity in and it's pumping, gets cold, and you cool down the refrigerator. So let's see, electricity into a sealed system, one end gets cold the other gets hot. Take that sealed system, and make [the bottom] end hot with your methane, and keep [the other] end cold, by cooling it with water — electricity comes out. So we're essentially running your refrigerator backwards, with a sealed system that makes about as much noise a your refrigerator, and will last as many years without maintenance. And it runs on any fuel. Anything that makes the bottom of that sucker hot, will give you electricity.
On a recent trial-run of the generator....
We put two of these machines to test it in two villages, 75 kilometers apart, last year in Bangladesh. And I thought, 'wow, it's going to run on cow dung, there will be all sorts of issues. We'll send engineers, and if we can get any data...'. Any data? Those machines ran flawlessly around the clock. Each village went from never seeing electricity, never having a light bulb at night, to being fully electrified. They're small villages. But they were fully electrified for nearly half year each. And the only fuel — there's no infrastructure for that either-that went into each of these boxes was [methane gas from] cow dung. A pit next to the box and the most basic bio-digester you've ever seen...the pipe comes out of it and into our engine, and it made electricity. And since the power was made locally, we had no transmission lines, and we had no infrastructure issues. And it created in each village three entrepreneurs. It not only wasn't sapping an economy, it was creating an economy. There was a guy now selling dung. If you annualized his 24 week income, he would have made $360 selling something that would not have had value. There was the guy running the generator. He was making a nice living. [And a third entrepreneur, selling things like light bulbs]

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