Abstract
A physical heat transfer model of the vertical vapor-liquid seasonal cooling device (SCD) inserted into soil and filled with Freon is considered. In the model, it is assumed that heat exchange with soil occurs at a constant coolant temperature, which corresponds to Freon phase transition temperature and depends exclusively on Freon properties and gas pressure inside the pipe. At a condenser temperature below the phase transition temperature, the SCD functions as a liquid thermosiphon due to enthalpy variation. The physical model of the vapor-liquid SCD is realized as a module in the TEMPA software package representing an internal heat source. The package is designed to solve non-steady-state thermophysical problems by the enthalpy method while considering phase transitions of the bound moisture.
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