Developers in Sweden plan to use the several aquifers already located underneath Stockholm's streets to heat and cool the buildings located above them.
From This Big City:
"Since water has an ability to store heat or cold, these aquifers work a bit like a thermos. The idea, more or less, is to pump up cold water in the summer to cool buildings above ground. This makes the water temperature rise a small amount. This water is then pumped back down into the ground and stored until next winter, when it can be used for heating buildings. In total, this process generates about three or four times as much energy than what is required for pumping the water up and down."
According to a post at ThisBigCity.net, scientists in Sweden "have yet to find any disadvantages with this technology."
FULL STORY: Can Underground Water Cool City Houses?
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Urban Design for Planners 1: Software Tools
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Learn the tools for implementing Universal Design in planning regulations.
Placer County
Mayors' Institute on City Design
City of Sunnyvale
HUDs Office of Policy Development and Research
Mpact (formerly Rail~Volution)
Cornell University's College of Architecture, Art, and Planning (AAP), the Department of City and Regional Planning (CRP)
Lehigh Valley Planning Commission
City of Portland, ME
Baton Rouge Area Foundation