Abstract
It is usually assumed that the heat conduction in the soil surrounding the pipe of an EAHE is one-dimensional in the radial direction which allows one to simplify the mathematics and eventually to obtain an analytical or semi-analytical solution to the problem. For the simulation model proposed in this work, the complete axisymmetric heat conduction equation is solved in the soil domain. The results of the simulation in terms of the air temperature were validated using experimental data available in the literature where they demonstrate an overall superiority over the other models that used one-dimensional heat conduction equations in the soil domain.
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