In the past we've talked about some things that you can do to make your house more energy efficient. Some things are easy, like putting in Compact Florescent light bulbs, while others are on their way in the near future, like your own personal wind turbine. There's only so much you can do at home, though, and many of us live in large, air-conditioned office buildings. How could a glass-covered skyscraper possibly use less power for cooling in the summer? If you live in Toronto, it's easy - just tie into the Deep Lake Water Cooling System. The system, by Enwave, draws water from Lake Ontario, deep below the surface where it's always a chilly 4 degrees Celsius. The water runs through huge heat exchangers before making its way into the city's normal water supply. A separate cooling loop transports water chilled by the incoming lake water to various buildings in the financial district where it is used in the air conditioning system. Here's a diagram of the system at work. The city is seeing substantial benefits since it tied into the cooling system:
Metro Hall went online with Enwave's Deep Lake Water Cooling system in June 2006. With the addition of this building, energy consumption will be reduced by 1.7 million kilowatt-hours per year and reduce CO2 emissions by 1,915 tonnes annually - equivalent to taking 383 cars off the road.According to Enwave, the system uses 90% less energy than a traditional air conditioning system and is price-competitive. This is one of those cases where you don't even have to pay a premium to reduce CO2 production. Here's a picture of the gigantic heat exchangers: Other large Great Lakes cities like Chicago, Cleveland, and Buffalo could take advantage of a system like this as well. Add in a few off-shore wind farms and the Rust Belt could take a real lead in green technology that makes use of the local geography. So what do you say, Cleveland?