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Heat transfer


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It depends a lot on the soil , If it is under ground water level it should be good conductivity. Then the heat transfer should depend on heat conductivity of the soaked soil. If it is above ground water level it may be worse. It may dry out around the pipe with airgaps etc. Some soils is not very heat conductive either. You should look for data on the soil type you have. Then apply the formulas that handle heat conducted through matter into a central pipe..   There are formulas for insulated pipes. Here the soil could be calculated as the "insulation".


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