Deep lake water cooling

Abstract

Deep lake water cooling is based on a very simple physical property of water: water is heaviest at a temperature of 4/spl deg/C, and is lighter at temperatures above and below this. As a result, any deep body of water will have a permanent layer of cold (4/spl deg/C) water at a depth of 83 meter, called the "hypolimnion", and this layer is renewed every spring and fall as the surface is warmed and cooled with the season: when the surface hits this critical 4/spl deg/C temperature, it sinks, and adds to the existing cold layer. This layer can provide a permanent renewable source of totally natural cooling. The deep lake water cooling project has it all: it makes business sense, it is environmentally responsible, and it will be reliable. Customer contracts are being negotiated right now and several new landmark buildings are expected to join Enwave's expanding cooling network over the next few months.