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Experimental study on the thermal control of a roof-top collective building antenna using a porous matrix filled with Water-Copper nanofluid

Authors:
F. Sastre, A. Martin-Garin, E. Martin, A. Velazquez, A. Baïri
Year:
2022
Journal:
Case Studies in Thermal Engineering
Volume:
32
Initial page - Ending page:
Art. Number - 101869
ISBN/ISSN:
2214-157X
DOI:
https://doi.org/10.1016/j.csite.2022.101869
Description:

This experimental work addressed the thermal control a roof-top collective building antenna meant to control home equipment in smart buildings. The antenna was placed inside a concentric quasi-cylindrical cavity maintained at low temperature. Cooling was provided by a Water-Copper nanofluid saturated porous matrix placed between the antenna and the enclosure. The ratio of the thermal conductivity of the porous material to that of the water varied from 4 up to 41.2. The nanoparticles volume fraction varied between 0% and 5%. The main result was a new semi-empirical correlation that allows for the determination of the antenna's average surface temperature as a function of the governing parameters: ratios of nanofluid to water and porous media to water thermal conductivities, nanoparticles volume fraction, and Rayleigh number. The applicability of the correlation was illustrated for a practical application case. It was found that, for some cases, the proposed thermal control system improves power dissipation by a factor of 33% as compared with the case of pure water (2 kW versus 1.5 kW)

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