The heat conduction model used here is the directed (why not) heat exchanger model of the bond graph library with an additional heat capacity built in at the output node. In this way, walls can be subdivided into layers, possibly consisting of different material, with heat conduction models cascaded without a need for attaching heat capacitors externally, except at the very first node.
Heat capacitors were attached only at one side, because otherwise, higher index models result when such models get cascaded. Although Modelica is perfectly capable of reducing the perturbation index on its own, this would only have slowed down the compilation of the model unnecessarily.
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