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We have developed a wick-free plate (WFP) in which a groove pattern is applied to the surface of a plate to replace the wick-plate, which is a key component of a multi-effect diffusion distiller (MEDD). Wicks and plates act as an evaporation surface and a condensation surface, respectively, in MEDD. However, the wick-plate structure has several problems, such as laborious manufacturing processes and lower durability. Therefore, in this study, WFPs were manufactured using the extrusion method, and MEDD with WFPs was experimentally evaluated. The extrusion method had a lower processing cost and better corrosion-resistance surface than the etching process that was employed in our previous study. The extruded WFP could lower the manufacturing cost by 77% compared to the etched WFP, and had the advantage of absorbing more solar radiation energy by lowering the installation inclination angle by 10°. After fabricating the triple-effect MEDD with the extruded WFPs, an indoor performance experiment was conducted. The results of the solar thermal performance test indicated that WFP-MEDD at 11.7 MJ/(m · d) of thermal energy produced 3% higher freshwater than the existing MEDD with a wick-plate.

Performance Experiment of Multi-Effect Diffusion Distiller with Extruded Wick-Free Plate