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36 Chapter 3 Heat exchanger design and construction This resulted in a very successful soldered metal-plastic MHE construction. Plate 3.1 Hot press built for fabricating wire mesh and thermosetting plastic pre-preg spacer MHE core. This n1ethod of construction placed certain limitations on the MHE geometry. Copper was used for the perforated plates instead of aluminium, for ease of soldering. Two thiclG1esses of copper sheet were cOlnmercially available, O.5ITIITI and O.2n1m. The O.2InITI sheet can1e as a roll and was flin1sy to handle. Severa samples of O.5mm thick perforated plates were manufactured by photo-chemical etching to explore the ower lilTIits of perforation diameter and perforation spacing which could be achieved by this process and the allowances required for the etchant under-cutting the photo-resist. Plate 3.2 shows two of these sarTIples. The lower plate shows the effect of under-cutting, the concave surface of the hole created by the etchant, even in a doub e sided etch. ThePDF Image | CO2 removal from air for alkaline fuel cells operating with liquid H2
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