Abstract
Modern heating systems for buildings need a supply temperature of approximately 35 C. Standard heat storage systems do not work very efficiently with small supply temperature differences, because of the low sensible heat storage capacity. In contrast to the sensible heat storage a phase change material (PCM) storage system uses the phase change process to store energy at small temperature differences [3], [4], [5]. In this paper a thermo hydraulic model of a PCM storage is developed and implemented by using Modelica, so that dynamic modelling is possible. To show the advantages of latent heat storage (LHS) the PCM storage model has been combined to build a standard heat pump system model with a PCM storage instead of a sensible water storage and the overall system is analysed.
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