Categories

Archives

A sample text widget

Etiam pulvinar consectetur dolor sed malesuada. Ut convallis euismod dolor nec pretium. Nunc ut tristique massa.

Nam sodales mi vitae dolor ullamcorper et vulputate enim accumsan. Morbi orci magna, tincidunt vitae molestie nec, molestie at mi. Nulla nulla lorem, suscipit in posuere in, interdum non magna.

ETList : Message: Waste heat into electricity at temperatures as low as 86 degrees

It’s estimated that as much as 20 to 50 percent of energy consumed in the world is dispersed as heat. We’ve seen waste heat harnessing technologiesbefore that convert that loss back into usable energy, but usually they only work with high temperatures.

Out of a laboratory at EPFL, a start-up has come up with a way to harness waste heat as low as 30 degrees Celsius (86 degrees Fahrenheit) to be converted to electricity. This new technology could see waste heat from things like waste incinerators, refineries and even data processors being used to make clean energy for buildings.

The technology is based on osmosis, as Phys.org explains is a “natural phenomenon that occurs when the concentration between two solutions separated by a membrane differs, for example between saltwater and freshwater. A stream flows from the less concentrated to the more concentrated solution, which tends to balance the concentrations on each side of the membrane. The mechanical energy of this stream may be converted into electrical energy by a turbine and an alternator. Heat is again used to separate the fluid into two separate solutions, one of which is more concentrated than the other. It is, therefore, a closed circuit (see image) that does not consume water.”

More http://tech.groups.yahoo.com/group/ETList/message/12741

Share

Leave a Reply