Heat storages are currently the most commonly used in heating of buildings, where the operating temperatures are relatively low (80 °C). By increasing the operating temperature of the heat storage, significantly more heat can be stored in the heat storage, thus reducing the volume of the heat storage. It can be used for industrial applications where heat is stored at higher temperatures than 100 °C. To maintain water in the liquid phase at elevated temperatures, the pressure in the storage tank must be maintained at an appropriately high pressure. In this work, we reviewed the current state of the art in high temperature heat storage. Based on the existing legislation and the relevant standard, we have designed a pressure vessel for the heat store. Two concepts for filling or heating the storage tank have been developed: heating at constant pressure and heating at constant volume and compared with each other on the basis of the amount of energy stored and the complexity of the design. First, a simplified insulation design was made to analyse the effect of different insulation thicknesses on the filling and cooling time of the storage tank. Based on the chosen insulation thickness, a thermal simulation was performed. The results obtained from the simplified design were compared with the results from the thermal simulation. Finally, a cost analysis of the construction of the feeder and an analysis of the feasibility of constructing and using this design of heat store were carried out.
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