Electrocaloric coolingPlaznik, Uroš (Avtor) Vrabelj, Marko (Avtor) Kutnjak, Zdravko (Avtor) Malič, Barbara (Avtor) Poredoš, Alojz (Avtor) Kitanovski, Andrej (Avtor) heat regenerationelectrocaloric coolingelectric-energy recoveryenergy analysisHere we explore the effect of electric-energy recovery and heat regeneration on the energy efficiency of an electrocaloric-cooling system. Furthermore, the influence of the polarizationelectric field hysteresis on the energy efficiency of the system is analysed. For the purposes of the analysis, the properties of (1 % x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-100xPT) with x = 0, x = 0.1, and x = 0.35 are characterized. We show that if no heat is regenerated, even small irreversibilities in the electric circuit used to recover the electric energy can cause a significant drop in the achievable energy efficiency. On the other hand, when a heat regeneration process is considered and a realistic value for the degree of electric-energy recovery equal to 80% is assumed, the limit for the energy efficiency of a system employing PMN ceramics is estimated to be equal to 81% of the efficiency of a Carnot heat pump.20152021-04-20 22:26:27Članek v reviji126396UDK: 621.5:620.9(045)ISSN pri članku: 0295-5075DOI: 10.1209/0295-5075/111/57009COBISS_ID: 14221083sl