Electrocaloric cooling: The importance of electric-energy recovery and heat regeneration

被引：35

作者：

Plaznik, U. ^{[1
]}

Vrabelj, M. ^{[2
,3
]}

Kutnjak, Z. ^{[2
,3
]}

Malic, B. ^{[2
,3
]}

Poredos, A. ^{[1
]}

Kitanovski, A. ^{[1
]}

机构：

[1] Univ Ljubljana, Fac Mech Engn, Ljubljana 1000, Slovenia

[2] Jozef Stefan Inst, Ljubljana 1000, Slovenia

[3] Jozef Stefan Int Postgrad Sch, Ljubljana 1000, Slovenia

来源：

EPL | 2015年 / 111卷 / 05期

关键词：

THIN-FILM; WORKING;

D O I：

10.1209/0295-5075/111/57009

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Here 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 polarization-electric 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)O-3-xPbTiO(3) (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. Copyright (C) EPLA, 2015

引用

页数：6

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