The Vision Harness the warmth given off by millions of commuters and reduce global energy demand by 15 percent
The Plan Your average human generates about 60 watts just lying on the sofa, and about 100 watts hustling for the train during rush hour. Swedish civil engineer Karl Sundholm aims to capture some of that excess energy, starting in Stockholm’s Central Station, where he’ll use a car-size heat exchanger to absorb air made warm by more than 250,000 daily commuters and use it to provide up to 15 percent of the heating needs of a building next door. The exchanger heats water pipes, which funnel the warm water to another heat exchanger in the new building, where the process is reversed: The hot water warms the air, helping to keep shop owners and cubicle dwellers toasty. In the summer, when body heat is less welcome, the same exchangers will transport cold water from a nearby lake to cool the building and the train station.
ETA Central Station could be capturing heat from hot Swedes by 2010.
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