Metzdorf, JuliusJuliusMetzdorfCorhan, PatrickPatrickCorhanBach, DavidDavidBachHirose, SakyoSakyoHiroseLellinger, DirkDirkLellingerMönch, StefanStefanMönchKühnemann, FrankFrankKühnemannSchäfer-Welsen, OlafOlafSchäfer-WelsenBartholome, KilianKilianBartholome2024-03-222024-04-092024-04-092024-03-222024https://publica.fraunhofer.de/handle/publica/46441210.1038/s44172-024-00199-zElectrocalorics (EC) is potentially more efficient than refrigeration and heat pumps based on compressors and does not need detrimental fluids. Current EC-prototypes use solid-state contact or forced convection with liquids to transfer the heat generated from the EC-material, which inhibits high cycle frequencies and thus limits power density. Here we present a heatpipe system solution, where the heat transfer is realized through condensation and evaporation of ethanol as a heat transfer fluid. Our prototype with lead scandium tantalate (PST) EC-material working at 5 Hz shows a specific cooling power of 1.5 W g-1. This is one order of magnitude more than previously reported for ceramic EC-prototypes. Overcoming the limits of slow heat transfer is essential to reach high specific cooling powers enabling a future commercial success of the technology.enElectrocaloricsHeatpipe systemEthanolHeat transferCoolingFraunhofer-Leitprojekt ElKaWejournal article