Calculation of the shallow foundation thermal resistance

QuickField simulation example

Using the shallow foundation to compare with the traditional deep foundation allows reduction of the expenses on building materials, work time and the cost of the project. But in the cold climate shallow foundations require additional thermal insulation. EPS plate placed directly under the foundation is one of these methods.

Problem Type
Steady-state heat transfer.

Geometry

Given
Temperature inside (upper edge of the foundation): T₁ = +20 °C;
Temperature outside (ground surface): T₂ = -20 °C;

Task
Compare thermal resistance of the shallow foundation with the insulation plate and without the plate.

Solution
Thermal resistance can be calculated as a ratio of the temperature difference value and the heat flux value.

Results
Insulation plate reduces heat losses by 10%:

Temperature distribution in the shallow foundation:

Insulated

Without insulation

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