Ultra-high-temperature electrocaloric heat pumpKlinar, Katja (Avtor) Gačnik, Darja (Avtor) Kitanovski, Andrej (Avtor) heat pumpshigh-temperatureelectrocaloric materialscaloric materialsenergy conversionheat transferregeneratorssolid-stateNearly a quarter of waste heat is generated at temperatures exceeding 300°C, yet conventional heat pump technologies remain inefficient in recovering and utilizing heat from such high temperature sources. In this study, we introduce a novel electrocaloric heat pump designed to operate with heat sources and sinks at ultra-high temperatures. The proposed heat pump system incorporates an active electrocaloric regenerator featuring PbZr$_{0.52}$Ti$_{0.48}$O$_{3}$ (PZT) epitaxial thin-film multilayers, which exhibit a superior electrocaloric adiabatic temperature change of 11.03 K at 402°C (675 K), and pressurized helium gas as the working fluid. We conducted a parametric analysis to simulate the performance of the ultra-high-temperature electrocaloric heat pump and identified the optimal conditions for single- and multi-stage configurations. The single-stage setup achieved a maximum heating COP of 7.8 at a 30 K temperature span across the regenerator at a heat source temperature of 660 K. In comparison, the multi-stage configuration yielded the highest heating power 113.3 W/kg$_{EC}$ and a max. COP 2.7 between 630 and 690 K. This study established a foundation for notable advancements in ultra-high-temperature heat pumps by employing electrocaloric energy conversion.20262025-12-23 12:38:03Članek v reviji177429UDK: 621.577:536.2ISSN pri članku: 0196-8904DOI: 10.1016/j.enconman.2025.120814COBISS_ID: 262744067sl