Due to sustainable industrial power plants, energy storage systems are now more significant for the industrial energy process and the ambient environment. Therefore, a regenerator energy storage unit was designed, constructed and erected for the Institute for Energy Systems and Thermodynamics (IET) of the Vienna University of Technology. The specific properties and the dynamic performance of such an energy storage system can be evaluated and analysed with the measurement system installed. The pilot plant consists of the following main components: blower-machine, air heater, butterfly valves and the heat storage container. Furthermore, pressure-, temperature- and mass flow measurement instruments have been installed to accumulate data on the physical behaviour of the inserted heat storage material. There are two operation modes for the fixed bed regenerator: charging and discharging of energy. Within the charging mode, energy in form of heat is stored by the storing material. Air is sucked from the surrounding environment with the help of a blower and leaves it in direction of the pipe network of the test rig. Within the tube network different arranged valves define the flow pass through the network. During the charging mode the air flows from the blower through the air preheater, where the air is heated up to the maximal allowed system temperature of the fixed bed regenerator. The heated air enters the fixed bed regenerator at the top and leaves it at the bottom in direction to the chimney. During the air flow through the storage container heat is transferred from the air to the storage material. The charging process is finished, if the air temperature at the storage outlet has reached a defined temperature. After that, the valves changes their position and the discharging process starts. During the discharging process the sucked air bypasses the air preheater and enters the storage device with ambient temperature at the bottom. The air is heated up during it is flows through the storage unit. The heated air leaves the fixed bed regenerator at the top in direction to the chimney. In an initial step, an analytical and a numerical dimensioning was realised for the pilot plant design. Important specific parameters, for example, the pressure loss over the storage device and the electrical power of the air heater, were centralized in analytical functions for a dependence analysis. Due to the importance of the storage material properties with regards to the non-steady state numerical temperature calculation, a storage material has been selected as initial parameter. The non-steady state calculation method Step-based method II, proposed by Hausen , has been used for the prediction of the temperature distribution inside the storage material. The unknown geometrical parameters of the storage material shape and the container referred to the procedural parameters with analytical functions. With these functions, an iterative approach has been realised to get the necessary geometrical inputs for the construction part of this thesis. Due to the thermo mechanical requirements which depend on the storage material, two storage containers were developed and built for the regenerator pilot plant. The first container is designated for bricks, the second for bulk material. The designed pilot plant has been erected for initial operation in the research lab provided by IET. First measurements with the bulk material container have been successfully realised with a large amount of loose gravel. The measurement results are presented at the end of this thesis for an initial analysis.