This model merges all thermal masses into one element,
parameterized by the length of the RC-chain nExt, the
vector of the capacities CExt[nExt] that is connected
via the vector of resistances RExt[nExt] and
RExtRem to the ambient and indoor air. By default, the
model neglects all internal thermal masses that are not directly
connected to the ambient. However, the thermal capacity of the room
air can be increased by using the parameter
mSenFac.
The image below shows the RC-network of this model.

splitFactor and
splitFactorSolRad.