There are almost as many geothermal-exchange methods as there are geothermal-exchange misconceptions.
Closed loop vertical exchange: Can be configured in 2-pipe, 4-pipe, concentric and many more adaptations.
Closed loop horizontal exchange: Can be configured in many various ways to apply open-trench based exchangers.
Closed loop pond/lake/ocean: These can be configured to use fabricated plate exchangers, or polyethylene pipe arranged in the body of water.
Closed loop energy piles: Like closed loop vertical exchange, these can be adapted in many different ways.
Open standing column wells: Primarily allows for reduction in boreholes, allowing for a smaller footprint. Needs specific geology (competent bedrock).
Open Class V well doublets: Primarily allows for reduction in boreholes, allowing also for a smaller footprint. Needs a specific geology (abundant aquifer). Great for large-scale applications in hot and humid climates (cooling dominant).
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