Dynamic temperature response of electrocaloric multilayer capacitors

Title
Dynamic temperature response of electrocaloric multilayer capacitors
Authors
권범진노임준백승협김성근김진상강종윤
Issue Date
2014-05
Publisher
Applied physics letters
Citation
VOL 104, NO 21, 213902-1-213902-4
Abstract
We measure and model the dynamic temperature response of electrocaloric (EC) multilayer capacitors (MLCs) which have been recently highlighted as novel solid-state refrigerators. The MLC temperature responses depend on the operation voltage waveform, thus we consider three types of voltage waveforms, which include square, triangular, and trapezoidal. Further, to implement an effective refrigeration cycle, the waveform frequency and duty cycle should be carefully chosen. First, our model is fitted to the measurements to evaluate an effective EC power and thermal properties, and calculates an effective cooling power for an EC MLC. The prediction shows that for a MLC with a thermal relaxation time for cooling, trc , a square voltage waveform with a duty cycle of 0&#8201;<&#8201;d&#8201;≤&#8201;0.3 and a period of trc &#8201;<&#8201;P&#8201;≤&#8201;1.4trc provides the maximum cooling power. This work will help to improve the implementing methods for EC refrigeration cycles.
URI
http://pubs.kist.re.kr/handle/201004/47656
ISSN
00036951
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KIST Publication > Article
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