THE BIG DIG

(Page 5 of 5)

April/May 2001
 
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Resources
International Ground Source Heat Pump Association (IGSPHA)
490 Cordell South Stillwater, OK 74078-8018 (800) 626-4747 http://www.igspha.okstate.edu

WaterFurnace International
9000 Conservation Way Fort Wayne, IN 46809 (800) 934-5667 www.waterfurnace.com

Office of Power Technologies U.S. Department of Energy
 (800) DEO-EREC (363-3732)

RELATED CONTENT

When possible, vertical wells are separated by 15 feet to avoid thermal interference between wells. The closed-loop heat exchanger is constructed from two parallel lengths of 0.75-inch polyethylene pipe, and a "U" bend is welded to the bottom end to connect the supply and return side of the exchanger. Once the exchanger is assembled, it is pressure-tested and a ten-foot section of re-bar is taped to it to keep the lead section straight. Next, a grout line is loosely attached and the exchanger is filled with water to prevent it from floating back out of the well if the well begins to fill with water. Once inserted into the well, the bore is grouted up with a bentonite clay slurry and the grout pipe is removed for reuse on the next well. The bentonite grout serves two functions: to seal the well and prevent contamination from surface sources, and to provide a medium for heat transfer between the exchanger tubing and the side wall of the well bore.

Related info:

Geothermal Checklist

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