Very Cool

Dave Williams has developed a refrigeration system that relies just on compressed air.

Williams, 26, knew that forcing compressed air through a hole in the middle of a pipe causes hot and cold air to flow from opposite ends, a phenomenon known as the Ranque-Hilsch vortex-tube effect. No one is quite sure how the separation works, but feed the cold air into a container, he reasoned, and you would have an icemaker and a freezer, which would have zero operating costs and would be environmentally friendly, since it wouldn’t require chemicals and the jet of air could be generated via a compressor powered by wind, water, man or animal.

At least that was the idea. Tinkering with heat-transfer equations, Williams tried to determine how much energy it would take to yield a block of ice. “It had been a while since I’d done real math problems. I had to break out the old textbook,” says Williams, a product-development consultant with his own firm, Dissigno, in San Francisco. After eons of number crunching, he hit on the right formula and built a prototype. It isn’t very efficient; his device uses 35 times as much energy as an electric fridge to make 1 kg of ice. But its simplicity could yield a killer app in Third World villages, where Williams hopes aid groups will distribute his icemaker as an economic-development tool. He aims to field-test it in Haiti later this year.


  1. I need a way to contact Dave Williams. I have decided to do a school project on his research, but w/o his contact it would be very hard to do this. Does anyone have any clues?

  2. Well, try contacting the company in question:

  3. This is Dave Williams from dissigno and I would be happy to answer any questions! ( dave (located at) dissigno (dot) com

  4. i own a large 35 acre farm which is for rent in |Leogane Haiti..if interested it has 8 bedrooms and 5 bathrooms and needs a tenant…..I could make you a good deal and we could benifit the lawless environement,,,best results Marc…also this is a site with three natural sprinssssssssss sssssssss

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