Calculation algorithm for a multilayer thermal insulation system of a thermal energy storage device with a high-temperature working fluid

RELEVANCE. Managing the surplus and deficit of electric power generation, which contributes to the stabilization of the energy system and enhances its reliability, is a pressing issue. One of the solutions is the development and implementation of thermal energy storage systems within distributed energy systems. An important task in their development is creating an effective insulation system. THE PURPOSE. To develop an algorithm for the effective design of insulation systems for thermal energy storages with high-temperature working bodies. METHODS. The research is carried out using theoretical methods, including thermal engineering calculation of thermal insulation layers and thermal conductivity analysis. Mathematical modeling methods were used to determine the thickness of the thermal insulation system of a thermal energy storage device. RESULTS. The design of a thermal energy storage device has been developed. Based on the developed algorithm, it was determined that the thickness of the thermal insulation system should be 151 mm (the thickness of the first thermal insulation circuit is 135 mm, the thickness of the second thermal insulation layer made of mineral wool is 16 mm), ensuring minimal heat loss at a temperature of the heat accumulator equal to 2000 °C. It was revealed that the radiant heat flux prevails in the layers closest to graphite, accounting for about 70% of the total flux. CONCLUSION. The study confirmed the effectiveness of the proposed multi-layer insulation system for thermal energy storage. The developed algorithm allows for the calculation of insulation systems of thermal energy storage, taking into account various parameters and operating conditions.

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