Abstract
The objective of this work is to study the effect that the addition of magnetic nanoparticles to a natural ester has on its properties and its cooling capacity. Some samples of ferrofluid (natural ester with maghemite) have been prepared using different concentrations. These have been characterized by measuring their thermo-hydraulic and dielectric properties, to find an optimal concentration. Then, the cooling capacities of the optimal nanofluid and the base fluid have been tested in a transformer immersed in these liquids. The experimental platform allowed the measurement of temperatures in different locations at different load levels. Parallel simulations of these tests have been carried out with a Computational Fluid Dynamics model of the experimental platform. The results show an improvement of the insulating capacity of the base fluid with the addition of maghemite nanoparticles, and an enhanced cooling capacity.
Highlights
The electric grids will grow in importance in the mid-term due to the generalization of the electric transportation
No effect of nanoparticles can be noticed in thermal conductivity, as tendency lines almost meet each other and are inside tester error gap of ±5% respecting base fluid conductivity in the studied range of temperatures
The characterization and cooling testing of a Fe2O3 vegetalbased nanofluid for transformer application are presented in this paper
Summary
The electric grids will grow in importance in the mid-term due to the generalization of the electric transportation. An increase of the percentage of energy delivered by the electric grid is expected. Renewable energy sources (solar and wind power stations) can disrupt the planned operation of the Transmission System Operators (TSO) of the electric grid. These challenges would be especially demanding for electric transformers, as nodes in networks. The grid resilience can be enhanced by the adoption of transformers with extraloadability. These must be adapted to manage these levels of power in safety by increasing their efficiency.
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