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

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:

EN ISO 10211:2007 test case 4
all length units are in millimeters.

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

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

Solution:
Air contact surface thermal resistance Rs is caused by the convection. The convection coefficient value is reciprocal to the surface resistance value:
α = 1 / Rs [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.