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Thermal bridges in building construction. Test case 3 validation ISO 10211:2007 Thermal bridges in building construction. Test case A.3 validation
QuickField validation of the test case A.3 presented in ISO 10211:2007 Thermal bridges in building construction.
3D problem of heat transfer.
all length units are in millimeters.
Thermal conductivity of AAC λ 1 = 0.7 W/K·m.
Thermal conductivity of insulation λ 2 = 0.04 W/K·m.
Thermal conductivity of brick λ 3 = 1.0 W/K·m.
Thermal conductivity of concrete slab λ 4 = 2.5 W/K·m.
Thermal conductivity of plaster λ 5 = 1 W/K·m.
The floor slab penetrates the wall near the corner and forms the cold bridge. Determine the flux and the thermal coupling coefficients.
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·m 2)].
Temperature distribution in media ( click to see 3D view):
Temperature in the corners:
Thermal coupling coefficients (reference values are in the brackets).
To comply with the ISO 10211:2007 the difference between calculated and reference heat flux should be less than 2% (0.1°K - for temperature). This simulation accuracy complies with the requirements of
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Thermal bridges in building construction - Heat flows and surface temperatures - Detailed calculations.