The Thermodynamic Principles Of Electrocaloric Effect And Refrigeration Research

When an electric field is applied to a dilelctric material it will induce a change in the entropy and temperature in the material.Such an electric field-induced temperature and entropy change in a dielectric material is known as the electrocaloric effect.The application of electrocaloric effect has a very important role in the cooling of microelectronic devices.The electrocaloric cooling shows high efficiency without noisy mechanical parts and polluting liquid refigerants.Lately,electrocaloric cooling has been the focus of considerable interest due to the recent discovery of a giant electrocaloric effect in thin films.(about 12 K).In this paper,a fundamental thermodynamic differential equation including the electric effect was proposed by incorporating the polar energy.Then,the thermodynamic expressions including the electric effect of heat capacity,temperature,entropy,and heat flux were derived.Electrothermal refrigeration for Carnot cycle,the electric effect of temperature,entropy,heat flux,and refrigerating coefficent were derived during this cycle.At the same time,according to electrothermal refrigeration apply specific model for microelectronic devices.Ferroelectric polymers as working substance,theoretical calculate temperature,entropy during a cycle.Theoretical calculation campare with experimental value,the validity of present theory is verified.