Abstract
This chapter describes formulation of simulation models for ultrahigh temperature latent heat thermal energy storage (UHT-LHTES) systems. A brief overview of the involved mechanisms and challenges in modeling these systems will be presented. A detailed overview of both explicit and implicit methods used to track a moving phase change front is provided. Main emphasis is given on an implicit type of method, the enthalpy-porosity approach, which is considered the most appropriate for such simulations due to its accuracy and computational efficiency. This approach will be analyzed in examples of simulating phase-change materials at ultrahigh temperatures. Modeling options, such as numerical models, discretization schemes, and grid resolution, will be thoroughly reviewed with respect to an accurate simulation of UHT-LHTES systems.
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