Radiation effects on exterior surfaces

In hygrothermal simulations usually the long-wave radiation effects are ignored or treated in a simplified way. Temperatures at exterior surfaces can not be calculated accurately in that way. A detailed radiation model has been developed to simulate the hygrothermal behaviour at the exterior surface of building components. Multiple experimental validation calculations show the capability of that model. Furthermore it is shown that neglecting the long-wave radiation effects on exterior surfaces can lead to simulation results which are not "on the safe side".