The Institute for Energy Systems and Thermodynamics desires to put a new experimental setup under operation. This setup allows experimental investigations of four different thermal energy storages. The first two storages use the latent energy of Sodium Nitrate, the other two storages warm up silica sand. A special feature is the compressed air fluidization of silica sand to improve heat transfer and enable sand transportation. To charge and discharge the storages, a stream of thermal oil is used. A special installation heats the thermal oil up to 390 C (734 F), and heat exchangers are used for re-cooling the oil. In the context of this thesis, a number of components is constructed and installed, and various components are selected. Advanced calculations of heat losses of all hot parts are conducted and serve as a decision basis for designing the insulation and trace heating. The design process of the overall experimental setup is described in this thesis as well.