Appendix 3: Thermal conductivity assumptions
The psi-values have been calculated according to BR 4979 using internal boundary conditions and are compliant with Part L of the Building Regulations. THERM 7.4.3 has been used to calculate the 2D models and TRISCO 13.0 has been used for the 3D models. Details noted with the PH icon are also suitable for Passivhaus standard, but the psi-values must be recalculated with external measurements for use in the PHPP.
The table below shows the material thermal conductivities that have been used for the calculations.
The U-values of the thermal elements have been calculated according to BR 497, section 3.1.3 and repeating thermal bridging elements have been included in the model when required. The psi-values ...
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