Abstract
Based on the finite-time thermodynamics, the optimized round-trip efficiencies of pumped thermal electricity storage (PTES) and pumped cryogenic electricity storage (PCES) are derived under different optimization criteria, which include maximum power optimization, efficiency power optimization, ecological optimization, and unified trade-off optimization. The effect of charging and discharging time ratio on the optimized round-trip efficiency (ORTE) of PTES and PCES systems is investigated. The upper and lower bounds of ORTE under different optimization criteria are reached when the charging and discharging time ratio tend, respectively, to infinity or zero. The optimized performance of PTES and PCES systems under different optimization criteria is compared, and it is found that the ecological optimization and unified trade-off optimization of PTES and PCES systems can give more superior performance.
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