Borehole Heat Exchanger
A downhole heat exchanger, (DHE) also called a borehole heat exchanger, (BHE) is a heat exchanger installed inside a vertical or inclined borehole. It is used to capture or dissipate heat to or from the ground. DHT's are used for geothermal heating, sometimes with the help of a geothermal heat pump. Downhole heat exchangers, like other use of geothermal energy, have the potential to significantly contribute to the reduction of emissions. In northern Europe, DHE are already widely deployed.https://www.mbie.govt.nz/assets/14861fe5a3/geothermal-barriers-update-1.pdf Types U-tube The heat exchanger usually consists of one or two u-tubes through which the carrier fluid, usually water, circulates. The space around the u-tubes is filled with groundwater or backfilled with thermally conductive grout. Open pipe Another design uses a single open pipe to flow water downward. The water then returns through the annular gap between the pipe and the casing. This design provides better therma ...
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