首页|Heat management and losses of electrocaloric cooling devices based on electrostatic thermal switches
Heat management and losses of electrocaloric cooling devices based on electrostatic thermal switches
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NSTL
Elsevier
Electrocaloric cooling is a promising technology that could replace existing vapor-compression technology with lighter and more efficient solid state based devices。 Among those， electrocaloric coolers using electrostatic actuation are rising; therefore harnessing their advantages and understanding their shortcomings is still a work in progress。 In this paper， we pin down two limitations that stem from a commonly used device design， and we propose a model that takes them into account。 The first is due to the displacement of the film， which moves the air around and causes losses。 We estimate the air losses through a Poiseuille flow model。 The second is related to the non-ideal Brayton cycle the device performs and which results in generating a heat flow opposite to cooling。 We estimated the effect of this back-flow on the cold flux using a 2D thermal diffusion model。 Ultimately， our results point at several possible improvements for further designs。 Among them， a slight reduction of the air pressure in the device looks as a promising solution to reduce air losses。
Air lossesCoolingElectrocaloricElectrostatic actuatorHeat transferViscous losses
Depreux L.、Parrain F.、Almanza M.、Zeggai N.、LoBue M.
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Université Paris-Saclay CNRS Centre de Nanosciences et de Nanotechnologies
NSTL
Elsevier
