ISO 10211:2007 Thermal bridges in building construction. Test case A.4 validation

QuickField simulation example

QuickField validation of the test case A.4 presented in ISO 10211:2007 Thermal bridges in building construction.

Problem Type
3D problem of heat transfer.

Geometry

Given
Thermal conductivity of insulation λ₁ = 0.1 W/K-m.
Thermal conductivity of metal λ₂ = 50 W/K-m.

Task
The metal bar penetrates the insulation wall. Determine the flux and the thermal coupling coefficients.

Solution
Air contact surface thermal resistance R_s is caused by the convection. The convection coefficient value is reciprocal to the surface resistance value:
α = 1 / R_s [W/(K·m²)].

Results
Temperature distribution in media:
EN ISO 10211:2007 test case 4 heat flux

	QuickField	Reference	%%
Temperature	0.801°C	0.805°C	0.004°C
Heat flux	0.543 W	0.54 W	1%

To comply with the ISO 10211:2007 the difference between calculated and reference heat flux should be less than 1% (0.005°C - for temperature). This simulation accuracy complies with the requirements of ISO 10211:2007.

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*ISO 10211:2007(en) Thermal bridges in building construction - Heat flows and surface temperatures - Detailed calculations.