Abstract
The paper presents first stage of research for numerical modelling of heat exchange in counterflow shell-type system with variable dimensions, which is partly placed under the ground level. Mathematical model of heat and mass balance is reduced to 1D case to make numerical calculation faster. Different kinds of boundary conditions (surface temperature, convection) and various physical properties of layer between pipes (from non-insulated to well insulated) are used to check the usability of created model.
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