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Nat. Commu.: Nano-diamond, 10 times better!
2024-05-10 09:40:33
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Electric card refrigeration uses the charging and discharging process of dielectric capacitors to achieve a high theoretical efficiency refrigeration cycle. From 2006 to 2008, the invention of electronic card (EC) ceramics and polymers attracted widespread global attention. Current research on EC equipment shows that it has the characteristics of high energy reversibility (>90%), high driving electric field energy recovery efficiency (>80%), simple driving method, compact device structure,
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Electric card refrigeration technology is based on the charge and discharge of dielectric capacitors to achieve efficient refrigeration. EC ceramics and polymers have attracted much attention due to their high energy reversibility, high recovery rate, easy actuation and compact structure. These materials are adaptable to existing large-scale production processes and demonstrate the potential of solid-state refrigeration technology. Through active electrothermal regeneration cycle verification, EC equipment can achieve a large temperature span, comparable to traditional refrigeration technology. Electrostatically driven polymer film coolers are an important breakthrough for use in confined environments. However, in order to increase the total power, EC materials need to be added, resulting in thickening of the working body and prolonged heat transfer time. Therefore, research needs to explore more efficient EC materials to improve refrigeration performance.
In-situ XRD experiments show that the improvement in ECE results from the reduction of the non-polar-polar phase transition energy barrier in the nanocomposite. Electrostatic force microscopy (EFM) tests revealed a significant increase in ND-polymer interface potential, which may directly enhance the polarization properties of the material. Based on the dual improvement of ECE and thermal conductivity, we developed a continuous rotating cycle EC refrigeration device model. Numerical analysis shows that nanocomposites as core refrigeration components can significantly enhance the refrigeration capacity and efficiency of EC equipment. At a temperature difference of 10K, the refrigeration device using T-ND-2.6% nanocomposite has a refrigeration coefficient (COP) as high as 5.3 (terpolymer is only 0.8), and the refrigeration power remains above 240W, which is relatively pure ternary copolymer. Physical equipment increased by 10 times.
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