Abstract
The number and the arrangement of freeze pipes and the energy needed to freeze a certain amount of soil are important factors for the economic success of a freeze project. A thermal design in which these factors are considered is based on the solution of a nonlinear unsteady heat conduction equation including phase transition. The equation is solved by means of a finite-element-method (FEM), considering boundary conditions related to artificial ground freezing.In this paper the basic mathematical techniques to deal with the transient heat conduction problem, with temperature-dependent soil properties, and the release of latent heat are described. The significance of the convective heat transfer coefficient and the temperature distribution in the coolant running through the freeze pipes are shown and their dependencies to other factors as refrigeration plant capacity or type of flow in the pipes are considered. Finally an example is presented.
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