Improving Solar Desalination Efficiency with Combined Techniques: Evacuated Tubes, Corrugated Fins, and Blue Metal Stones

Solar desalination efficiency can be significantly altered by combining several approaches to improve evaporation rate. The objective of this research is to find a way to make solar stills (SS) more efficient by combining evacuated tube solar collectors, blue metal stones, and corrugated fins. An investigation into a six-tube evacuated solar collector was conducted to increase the system's evaporation rate. Corrugated fins were thought of to rise the surface area of heat transfer between the water and absorber. Blue metal stone was proposed to keep the water at a maximum temperature even when solar radiation is minimal. Separate displays of the cumulative distillate output (DO) numbers and hourly values for each time period provide a comprehensive view. Based on the findings, the peak period for DO moves from 1 p.m. on a sample day in May 2024, which is six months into the project. In comparison to CSS, MSS temperature values are over 55 °C higher at the peak and nearly 26 °C higher on average. On top of that, the total DO during the day can reach 2.64 to 6.82 L, while at night it rises from 0.067 to 0.96 L. In addition, there is a 146.3% improvement in the average DO during the six months, going from 3.02 to 7.22 L. Additionally, MSS is 0.43₹ per liter and CSS is 0.47₹ per liter, in that order. The net amount of carbon dioxide reduction achieved by modified solar stills was approximately 2.44 times greater than that of conventional solar stills.