<img src="/sites/datacenterknowledge.com/files/wp-content/uploads/2009/07/ibm-aquasar.jpg" width="470" height="303" /> IBM has delivered an energy-efficient supercomputer cooled by hot water. The Aquasar cooling system uses water at temperatures of up to 140 degrees, and as a result consumes up to 40 percent less energy than a comparable air-cooled machine. IBM has delivered a supercomputer cooled