Abstract
The article discusses thermal properties of synthetic ester admixed with nanoparticles. The analyzed thermal properties were: thermal conductivity λ, kinematic viscosity υ, density ρ, specific heat cp, and the thermal expansion factor β- all obtained by means of measurements. On the basis of these, the authors calculated the heat transfer factor α, which determines the ability of the liquid to heat transport. The authors used nanoparticles of fullerene C60 and titanium oxide TiO2. The analysis of the thermal properties was done for the temperatures of 25, 40, 60 and 80 °C. The authors analyzed the impact of nanoparticles C60 and TiO2 on thermal properties of synthetic ester. They proved that fullerene C60 in principle had no influence on heat transfer factor α of the ester, while titanium oxide TiO2 had some positive influence on the factor, the value of which increased about 1–3%.
Highlights
In addition to electrical insulation, one of the main functions of the electro-insulating liquid, filling the inside of the transformer, is to transport heat outside the device
The authors analyzed the impact of nanoparticles C60 and TiO2 on thermal properties of synthetic ester. They proved that fullerene C60 in principle had no influence on heat transfer factor α of the ester, while titanium oxide TiO2 had some positive influence on the factor, the value of which increased about 1–3%
Similar to the case of nanofluids based on synthetic ester and fullerene C60, modification of the base liquid with titanium oxide TiO2 nanoparticles without any additional action resulted in the occurrence of the sedimentation process
Summary
In addition to electrical insulation, one of the main functions of the electro-insulating liquid, filling the inside of the transformer, is to transport heat outside the device. The doping of electro-insulating liquids with nanoparticles is aimed at improving such dielectric properties as electrical strength, resistivity, dielectric loss, permittivity [17,18,19,20,21,22,23,24,25,26,27]. That, depending on the type of used nanoparticles, modifying them with electro-insulating liquids can significantly improve the dielectric and thermal properties of nanofluids in relation to the base liquid. As a result, it translates into longer transformer life and better cooling conditions. The authors of this publication proved in their research that doping of mineral oil [31] and natural ester [32] with TiO2 nanoparticles improves selected thermal properties. The obtained nanofluids are characterized by adequate durability of dispersions and thermal properties that are different than those of liquids
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