01.15
An article from last year. The bridge is heated using geothermal energy, which reduces the need for salt on the bridge. Good idea?
Four-foot-diameter caissons were drilled into the ground adjacent to the stream bed. Below a depth of 10 feet, the soil temperature is between 50 and 55F. Heat is extracted from the caissons through heat exchangers as a glycol fluid is pumped through the system.
The heat is transferred via closed loop three-quarter inch stainless steel pipes, embedded in the concrete deck, which weave up and down — six inches apart — across the 100-foot span. The glycol then warms the deck, melting ice and snow. Depending on the outside temperature, auxiliary flash boilers are activated to increase the glycol’s temperature, speeding the melt.
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