Paper Info

The Impact of Anodization on the Thermal Performance of Passively Cooled Electronic Enclosures Made of Die-cast Aluminum
Natural convection and thermal radiation from anodized die-cast aluminum enclosures designed for the application of high power density battery chargers are investigated experimentally. Several sample enclosures are prepared using the two most commonly available types of anodization: i) Type II-black; and ii) Type III-clear. The enclosures are then tested in a customized natural convection - thermal radiation test chamber. Total emittance of bare and anodized surface is measured using Fourier Transform Infrared Reflectometer (FTIR) spectroscopy.nnThe results show that the total hemispherical emissivity of die-cast aluminum sample surface can be significantly improved from 0.14 to 0.92 after anodizing. More importantly, anodization can lead to a considerable reduction in thermal resistance (up to 14.7%) compared to the identical untreated enclosures. Becausenof the unique surface morphology of anodized die-cast aluminum, it is also observed that the same improvement of thermal emissivity as well as overall thermal performance can be achieved by either types of anodization.
Zhongchen Zhang
Other Author
Michael Collins, Chris Botting, Eric Lau, Majid Bahrami

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