In this example phase change material (PCM) is connected to a fluid circuit.
Phase change material can store a high amount of energy due to its very high thermal inertia. This energy can e.g. used for a fast engine warm-up, to provide cooling performance in the HVAC system (evaporator) while no compressor is available, …
For the modeling of the phase change material, a subsystem containing a network of controllers is included. Additionally a virtual point mass (Phase Change Point Mass, only for internal calculation) is created and directly connected to the point mass in the fluid network. The heat is set at this virtual point mass, which directly sets the temperature at the coolant side PM.
The basic idea is that the sensible heat is calculated and only this “effective temperature changing” value is set at the virtual point mass. To take care of the melting / solidification energy, the actual change of enthalpy is calculated by a continuous evaluation. If the enthalpy is below / above the hold point, the subsystem can use the cp values for these areas and calculate the temperature change.
For simplification purposes, the cp value for the solid and for the liquid phase is constant, the change of enthalpy due to the phase change is considered in the melting heat.Usable from release: KULI 9.1-0.01