Investigation of the impact of five adhesives on the absorption, diffusion rate, and evaporation in fabric attached to aluminum plate
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Abstract
The objective of this experimental study was to identify a suitable type of adhesive that can effectively enhance the absorbency rate and water evaporation capacity of fabrics, consequently improving the cooling capacity of evaporative coolers. Five distinct adhesives, utilized as binders between fabric and aluminum, were compared. The water absorption and diffusion rate through the adhered fabric onto the aluminum workpiece was evaluated by observing the behavior of water droplets. The evaporation capacity was measured in a test rig by assessing the outlet humidity ratio of air after flowing over the wetted sample. Among the tested adhesives, Draga glue demonstrated superior performance in terms of water diffusion rate, evaporation, and cost per unit mass. With Draga glue, water diffusion rates were 5.64, 7.36, and 11.52 times higher than those of SikaFlex 740, hot glue, and SA, respectively. The outlet humidity ratio from the Draga glue sample reached 16.91 g/kg, exceeding the rates of SikaFlex 740, hot glue, and SA by 22.17%, 22.46%, and 26.70%, respectively. Economically, Draga glue was found to be twice as cost-effective per unit mass as the other adhesives studied. These findings indicate that the use of Draga glue can significantly enhance the diffusion rate, evaporation, and cooling capacities of evaporative coolers.
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