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:

all length units are in millimeters.

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

Problem:
The metall bar penetrates the insulation wall. Determine the heat flux and the maximal temperature of the bar on the opposite side of the wall.

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:

 QuickField Reference %% Temperature 0.797°C 0.805°C 0.008 K Heat flux 0.543 W 0.54 W 1.0%

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.

See the iso_10211_2007_case4.pbm problem in the Examples folder.