Open Loop Systems:
Open loop systems are just one of the options when it comes to the utilization of geothermal energy for residential heating and cooling as well as full scale energy production. Open loop systems use water from either a surface or underground source. They generally consist of two wells drilled to a depth that are capable of administering the proper amount of heat needed for the system to function at its full potential.
A typical example of a open loop system utilizing an aquifer. [3]
Another example of an open loop system with intake from a lake or pond. [4]
When using an open loop system to supply your project with geothermal energy you must make sure that the supply well and the return well are positioned far enough away from each other to ensure that thermal recharge takes place other wise your system will not function properly.