The adoption of adsorbent materials is driving innovation in thermal energy storage and cooling technologies, thanks to their favorable environmental and economic properties. In adsorption-based systems, the efficiency of water vapor phase chang, specifically evaporation and condensation, plays a central role in determining overall system performance. Structured packing materials like Pall Rings, widely used in chemical engineering, have the potential to significantly enhance heat and mass transfer by increasing the contact area and promoting more efficient vapor-liquid interactions. However, their specific impact on evaporation and condensation processes under vacuum conditions relevant to adsorption systems remains underexplored. This thesis presents the design and construction of an experimental test rig capable of operating under vacuum, aimed at quantitatively assessing the influence of Pall Rings on heat and mass transfer rates during water evaporation and condensation.