Several sensible thermal energy storage technologies have been tested and implemented since 1985. These include the two-tank direct system, two-tank indirect system, and single-tank thermocline system. Solar thermal energy in this system is stored in the same fluid used to collect. Solar thermal power generation holds great promise for providing the world with clean, renewable and cost-competitive power on a large scale. TES allows solar power plant operators to adjust electricity production to match consumer demand, enabling the sale of electricity during peak demand periods and boosting plant. With the advantages of low cost, simple structure, and high efficiency, a single-tank thermal energy storage system is a competitive way of thermal energy storage (TES). In this study, a two-dimensional flow and heat transfer model of a cylindrical storage tank with water as heat transfer fluid. This paper discusses a packed bed thermocline tank as a thermal energy storage solution.
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