Thermal Performance Analysis Of a Solar Still Coupled With An Evacuated Glass Tube (Egt) System

Abstract

The lack of drinking water is a significant global issue, especially in places that rely on salty or brackish water.  Solar desalination is a long-term solution, but conventional solar stills don't work very well, so they can't be used on a large scale.  This study looks at how a solar static by an (EGT) system behaves when heated and how much distillate it produces when forced air flows through it. A comprehensive thermal model was created to measure how heat moves between the EGT, absorber tubes, annulus air flow, and still basin. There were experiments over three days while measuring solar insolation, basin Climate, covering glass humidity and temperatures of water. The results show that the EGT coupling greatly improved heat absorption and water temperature, which led to better evaporation and freshwater yield.  Solar insolation reached its highest point at noon, when it was between 911 and 935 W/m². This caused the degree Celsius of the water in the basin to upturn on all days. Changes in temperature on the inside and outside glass surfaces showed that heat was successfully moved to the basin.  In general, the solar still with EGT assistance greatly improved thermal performance and showed great promise for high-efficiency desalination in sunny areas. This shows that EGT-assisted stills greatly increase freshwater yield by speeding up the overall heat transfer rate. This study helps make hybrid solar distillation systems work better and shows that they can be used to make freshwater in a sustainable way.