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In this thesis the dynamics of temperature and flow in the Västerås district heating system is simulated using a model developed in Dymola. The model is dynamic and takes the transit times in the network into consideration. Due to insufficient statistical material, no pressure calculations have been done. Only the dynamics of temperature and mass flow have been simulated.

The district heating network has been split into 18 nodes, one production unit and the distribution pipes. Due to the lack of good measurements, especially from different places in the network, many simplifications have been made. Data gathered at the production unit have been used to form equations for things happening in the nodes. These simplifications means that the model is not suited for seeing what happens in the DH network and should only be used for seeing what happens at the production unit. However, if more data were to be gathered at more places around the network, the equations could be rewritten thus improving the model substantially.