We have all been in places where the crush of human bodies has resulted in uncomfortable temperatures. In some places this unavoidable occurrence can only be countered with a large mechanical cooling system.
Until someone discovers a way to utilize this energy.
The Stockholm Central Station is configuring a mechanical system that instead of simply removing the excess heat from station they intend to capture this energy to heat an adjacent office building.
The proposed system will utilize a closed loop heat transfer system that will distribute water warmed up by people in the Central Station to a new office building that will house a small hotel and a few shops.
The additional cost of the pipes and pumps is not, by itself, cheap. However projections of system use offer a 20% reduction in energy use from a standard heating system that when added to overall cost of the building makes the added cost seem "not that much" according to Karl Sundholm of Jerhuset, a property administration company run by Swedish government.
If proved viable restructuring building systems to take advantage of the occupant usage instead of merely treating building program as a 'problem to be solved' may become an effective way to structure design solutions for occupied projects. Besides generating power (don't forget to check out this link on crowd farming) I wonder what other potential solutions are in the proposal phase...
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