In case of graded boreholes there is also a dependency on the tilt angle. Those g-functions depend on the spacing between the boreholes at the ground surface and the borehole depth. This sustainable technique can be used for cooling and heating of houses, cooling of telecommunication switchboards, etc.ĮED is based on parameter studies with a numerical simulation model (SBM) resulting in analytical solutions of the heat flow with several combinations for the borehole pattern and geometry (g-functions). This is a renewable, environmentally friendly energy source. In cooling mode, the process is reversed. The fluid is then re-warmed as it flows through the ground. In ground source heat pump system, heat is extracted from the fluid in the ground connection by a geothermal heat pump and distributed to the building.
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