According to this article in the Toronto Star - Hollywood Actor Alec Baldwin launched the world's largest alternative energy project in Toronto yesterday. The $170 million initiative uses cold lake water to cool downtown office buildings.
The deep lake cooling system cuts electricity consumption in commercial buildings by 75% by utilizing near freezing water from 83 metres below the surface of Lake Ontario.
It has the capacity to air-condition 32 million square feet of office space - the equivalent of 8,000 homes.
The article doesn't explain in detail how the heat exchange system works however I suspect it's similar to heat pump systems that can be installed in individual homes which can be used for both heating and cooling as an alternative to traditional air-conditioning and heating systems. One of our readers in Canada has requested tips on how to make their home more energy efficient, in the future we will be giving further coverage to heat pump systems.
http://www.thestar.com/NASApp/cs/ContentServer?pagename=thestar/Layout/Article_Type1&c=Article&cid=1092694222815&call_pageid=968867495754&col=969483191630
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