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Open Loop Earth Link
An open loop earth link consists of a water supply and somewhere to put the water after it is used by the heat pump. The most common form of an open loop consists of a water supply well working in conjunction with a return or injection well. The water is pumped from the supply well and run through the exchange coil at 52 degrees, then returned to the aquifer via the injection well. This type of earth link is relatively inexpensive to construct but needs ongoing maintenance of the pumping equipment and the injection well. A few benefits of this are that the water can be recycled to use for irrigation and other purposes. A few drawbacks are that the coil and injection well are prone to fouling due to mineral scale and build up and the hydraulics of the aquifer involved in the injection of the water are never a constant.
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