15 Jun '11, 12pm

Water or Rocks: What’s the Secret Ingredient for Energy Storage?: One group likes water and air. The other pre...

Water or Rocks: What’s the Secret Ingredient for Energy Storage?: One group likes water and air. The other pre...

One group likes water and air. The other prefers heat and earth. It sounds like a panel that Aristotle might have moderated 2,500 years ago, but actually it marks the difference between two different approaches in modular compressed air energy storage . SustainX , a well-funded spin-out from Dartmouth College, has come up with a modular energy storage system that relies on water to prepare a mass of compressed air that can later be delivered to a turbine. A 40-kilowatt prototype exists, and in 2012, a 1-megawatt system for AES should be ready. LightSail , a somewhat secretive startup funded by Khosla Ventures, is taking a similar approach. England’s Isentropic Energy compresses gases for turbines too, but instead of water, the active ingredients are two gravel-filled tanks: a cold one with rocks at minus 160 degrees Celsius and a hot one with rocks at 500 degrees Celsius. ...

Full article: http://www.greentechmedia.com/articles/read/water-or-rock...

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The Rocks! You Rock!!

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redmummy.com 24 Jun '11, 1am

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greentechmedia.com 13 Jun '11, 5pm

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greentechmedia.com 13 Jun '11, 2pm

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Water Legacy Helps with Greywater Reuse

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