SYSTEMATIC AND MULTI-CRITERIA OPTIMISATION OF SUBCRITICAL THERMALLY INTEGRATED CARNOT BATTERIES (TI-PTES) IN AN EXTENDED DOMAIN

Thermally integrated pumped thermal energy storage (TI-PTES) is a flexibility option to recover lowgrade heat (i.e. < 100°C) and to provide overnight storage. Common criteria when optimising such system are the power-to-power efficiency (i.e. electricity recovery), the total exergy efficiency (i.e. combined heat and electricity recovery) and the energy density (i.e. storage size). However, these objectives are generally conflicting and multi-criteria optimisation