TY - GEN
T1 - Compact cooling devices based on giant electrocaloric effect dielectrics
AU - Li, Xinyu
AU - Gu, Haiming
AU - Qian, Xiaoshi
AU - Zhang, Qiming
PY - 2012
Y1 - 2012
N2 - The entropy and/or temperature change of material with respect to electric fields is known as electrocaloric effect (ECE). Giant ECE is discovered in P(VDF-TrFE) ferroelectric copolymers near ferroelectric-paraelectric (F-P) transition temperature. F-P transition is normally much higher than room temperature around which is preferred by working temperature of cooling device configuration. This paper presents the two defect-inducing methods to lower and broaden working temperature range of P(VDF-TrFE) based copolymers for ECE. Giant ECE is experimentally demonstrated in large temperature range (0-55°C). In addition, an electrocaloric oscillatory refrigerator (ECOR) was proposed and simulated by finite volume method and its high performance was theoretically demonstrated. Temperature gradient larger than 30 °C can be maintained across the two sides of a 1 cm device. For ΔT=20 °C cooling condition, a high cooling power (5.4 W/cm 2) and significantly higher coefficient of performance (COP) can be achieved (50% of Carnot efficiency).
AB - The entropy and/or temperature change of material with respect to electric fields is known as electrocaloric effect (ECE). Giant ECE is discovered in P(VDF-TrFE) ferroelectric copolymers near ferroelectric-paraelectric (F-P) transition temperature. F-P transition is normally much higher than room temperature around which is preferred by working temperature of cooling device configuration. This paper presents the two defect-inducing methods to lower and broaden working temperature range of P(VDF-TrFE) based copolymers for ECE. Giant ECE is experimentally demonstrated in large temperature range (0-55°C). In addition, an electrocaloric oscillatory refrigerator (ECOR) was proposed and simulated by finite volume method and its high performance was theoretically demonstrated. Temperature gradient larger than 30 °C can be maintained across the two sides of a 1 cm device. For ΔT=20 °C cooling condition, a high cooling power (5.4 W/cm 2) and significantly higher coefficient of performance (COP) can be achieved (50% of Carnot efficiency).
UR - http://www.scopus.com/inward/record.url?scp=84866179944&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84866179944&partnerID=8YFLogxK
U2 - 10.1109/ITHERM.2012.6231525
DO - 10.1109/ITHERM.2012.6231525
M3 - Conference contribution
AN - SCOPUS:84866179944
SN - 9781424495320
T3 - InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITHERM
SP - 934
EP - 937
BT - Proceedings of the 13th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2012
T2 - 13th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2012
Y2 - 30 May 2012 through 1 June 2012
ER -