article · IEEE Transactions on Dielectrics and Electrical Insulation
Natural ester dielectric oil, specifically FR3, exhibits substantially enhanced thermal performance after the incorporation of pentyl-graphene nanosheets. Experimental evaluations of thermal diffusivity and specific heat were conducted across a range of nanoparticle concentrations and operating temperatures from 30 °C to 90 °C. Dielectric assessments demonstrated that the dielectric constant remains stable in the kilohertz frequency range, rises at lower frequencies, decreases as temperature climbs, and saturates at a concentration of 0.008% weight by weight. Light absorption methods were utilised to assess nanoparticle agglomeration levels and track property changes. The optimum loading was determined to be 0.008% weight by weight, delivering a 43.04% boost in thermal diffusivity together with a 6.18% rise in the dielectric constant.
Dielectric oils are critical for thermal management and electrical insulation in power equipment. Improving natural ester oils with carbon nanomaterials offers stronger heat dissipation without degrading electrical performance. Demonstrating that minute quantities of functionalised graphene markedly boost thermal diffusivity helps advance the development of more efficient, plant-based dielectric fluids for elevated temperature environments.
This early-stage experimental research is relevant to developers and manufacturers of dielectric fluids and electrical cooling solutions. The findings show that a tiny concentration of pentyl-graphene nanosheets substantially increases thermal diffusivity in natural ester oil. However, the abstract describes laboratory property characterisations, indicating that long-term stability testing and field trials remain necessary before commercial implementation.
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This work reports on the significant enhancement of the thermal properties of the FR3 natural ester dielectric oil after the addition of pentyl-graphene nanosheets, as confirmed by thermal diffusivity and specific heat studies at different concentrations and temperatures (30 °C–90 °C). Experimental results of the dielectric constant demonstrated a constant value in the kHz region while increased in the low-frequency region, decreased with increased temperature, and saturated at 0.008% w/w concentration. In addition, light absorption is used for a better understanding of the properties variation upon changing graphene’s concentration as a method to estimate the agglomeration level. The optimum concentration for its best performance in terms of thermal and dielectric properties is 0.008% w/w, whereby the thermal diffusivity and the dielectric constant increased by 43.04% and 6.18%, respectively.
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DOI: 10.1109/tdei.2022.3163814
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