Abstract
Abstract Analytical expressions are developed for the discharge efficiencies for closed, fully mixed, sensible thermal energy storage systems. Using discharge efficiencies, the optimum discharge period based on thermodynamic criteria can be determined. The authors conclude that, since exergy is a measure of the quality or usefulness of energy, exergy performance measures are more significant than energy performance measures, and that exergy analysis should be considered in the evaluation of the optimum discharge period for thermal energy storage systems. The application of the results to a particular example illustrates the usefulness of using exergy-based performance measures.
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