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Closed Loop Earth Link
A closed loop vertical earth link consists of a number of boreholes being drilled into which a length of tubing is inserted with a u-bend on the bottom. Each borehole has a supply and return in the same borehole. Your installer based on the total heat/air-conditioning load of your project determines the number of boreholes needed. The boreholes are manifolded together creating a giant radiator underground. This radiator either absorbs heat or absorbs cold depending on the season. The fluid in this giant radiator is closed much like a hydronic system. It circulates the same fluid over and over through the radiator. The fluid is circulated using a very small pump. Typically they are 1/25 of a hp using very little electricity. A few benefits of a closed loop are that you have no wells or large pumps to maintain. The entire loop field is below grade. Minerals or aquifer hydraulics does not affect the loop field. A few drawbacks are that the loop field is more costly upfront. Not all installers have the equipment to install closed loops.
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