The effect of water salinity and radiation intensity to the temperature distribution and evaporation rate inside porous media

In the coastal areas, there are found many cases of clean water crisis; the most reasonable solution is to use the solar still from salty seawater. Sea salt concentration levels vary widely in each region depending on ecological conditions and materials carried by the river. This study aims to analyze the effect of salinity and radiation intensity towards the evaporation rate. Several parameters, such as the difference in the mass of the specimen, surface temperature, and evaporation rate were observed. The evaporation rate data shows that concrete with ferrous sand aggregate (particle size of 0.125 mm) has the highest value in which the thermal conductivity value of this specimen is of the highest value as well. Higher salt addition and radiation cause the temperature value that each specimen generated to become higher. Therefore, the FS125, which is concrete with 0.125 mm ferrous sand aggregate, has the best capability of porous media in the absorbent plate of solar still application.