Dynamic modelling and simulation offers a way to investigate the transient behavior of thermal energy storage (TES) systems. Most modelling work presented in literature focuses only to sub-processes of a TES facility, especially, if the comparison against experimental data is included. In this study, we combine experimental and computational work, and aim at modelling and investigating the whole TES system. We share experiences gained and discuss results, including the experiments planning, modelling scope, measurement uncertainty, heat exchange, heat losses, calibration and validation. [ABSTRACT FROM AUTHOR]