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Methodology and figures of merit for designing a hybrid thermal energy storage unit.


A thermal response model for designing a hybrid thermal energy storage (TES) unit is developed. The storage time and maximum operating (hot side) temperature-to-transition temperature difference are used to characterize the performance of the unit. The thermal properties of the PCM employed in the design are investigated. Integration of a design optimization algorithm into a thermal performance model of the TES-hybrid unit results in determination of a best design subject to geometric and heat loading constraints. A prototype based on this best design is build and used to benchmark the performance model. The performance measured is consistent with the simulation model predictions of performance.