Study of the actuation losses in an electrocaloric cooling device

Étude des pertes d'actionnement dans un réfrigérateur électrocalorique

Lucas Depreux (1, 2) , Morgan Almanza (2) , Fabien Parrain (1) , Martino Lobue (2)

1 C2N - Centre de Nanosciences et de Nanotechnologies
2 SATIE - Systèmes et Applications des Technologies de l'Information et de l'Energie

Electrocaloric cooling is a promising technology that could replace existing gas-based refrigerators with more efficient solid state based devices. The key to improve electrocaloric coolers is to increase both the cooling power and efficiency, two goals that mostly conflict each other. Reaching high cooling power can be achieved by increasing the working frequency. The control of the heat exchange between the hot and the cold reservoirs produces viscous dissipation, a major hindrance to power improvement and to efficiency. Here we consider a cooler design that has been recently studied as a promising alternative to regenerator-based devices [1, 2], where a planar electrocaloric film is electrostatically actuated to move between the two reservoirs. Relying on a Poiseuille flow model, we examine the trade-off between the actuation time and the viscous losses, and its impact on the electrocaloric cooling power. Our model predicts that the cooling power can be increased up to 325 mW cm −2 .

Mots clés: Electrocaloric; Cooling; Electrostatic; Actuator; Viscous losses

Domaines: Energie électrique; Mécanique des fluides [physics.class-ph]; Thermique [physics.class-ph]

Lucas Depreux, Morgan Almanza, Fabien Parrain, Martino Lobue. Study of the actuation losses in an electrocaloric cooling device. 4ème Symposium de Génie Électrique (SGE 2021), Jul 2021, Nantes, France. ⟨hal-03325285⟩