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 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.
*ISO 10211:2007(en) Thermal bridges in building construction - Heat flows and surface temperatures - Detailed calculations.
See the iso_10211_2007_case4.pbm problem in the Examples folder.