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Main >> Applications >> Sample problems >> Thermal bridges in building construction. Test case 4 validation

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

ISO 10211:2007, thermal bridges in building construction

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
ISO 10211:2007 Thermal bridges in building construction. QuickField validation of the test case A.4 presented in ISO 10211:2007 Thermal bridges in building construction. Insulation Metal T=0°C Rs = 0.1 W/m2K T=+1°C, Rs = 0.1 W/m2K 1000 mm 1000 mm 200 mm 400 mm 100 mm 50 mm

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 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.

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

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