Going Underground

Twenty-four closed-loop wells were drilled to a depth of 395 feet beneath Lohan Anderson’s Richard M. Daley Branch Library’s parking lot. A geothermal heat pump will contribute significantly to LEED certification; the Daley library is targeting LEED Silver.

Lohan Anderson’s Richard M. Daley Branch Library, which is currently under construction in the Humboldt Park area of Chicago, incorporates a GHP system.

One of the most economical and efficient applications of a closed-loop geothermal system is in a pond or lake (the water must be at least 6 to 8 feet deep, however, so the pipes don’t freeze). This illustration shows a typical pond loop system, in which overlapping circles of pipe form what are known as “slinky coils.” These are then sunk to the bottom of the body of water.

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