Over deze norm
||Thermische eigenschappen van gebouwen
This standard sets out the specifications for a 3-D and 2-D geometrical model of a thermal bridge for the numerical calculation of: . heat flows in order to assess the overall heat loss from a building or part of it; . minimum surface temperatures in order to assess the risk of surface condensation. These specifications include the geometrical boundaries and subdivisions of the model, the thermal boundary conditions and the thermal values and relationships to be used. The standard is based upon the following assumptions: . steady-state conditions apply; . all physical properties are independent of temperature; . there are no heat sources within the building element. It may also be used for the derivation of linear and point thermal transmittances and of surface temperature factors.