Analysis and eva‎luation of solar absorber for water desalination in small capacities

10/20/2024 12:00:00 AM

Due to the lack of fresh water and successive droughts, it is necessary to pay attention to the desalination of sea water to solve this problem. Common sweetening methods are thermal and membrane methods. Among the environmental effects of these methods is the use of fossil fuels as an energy source. The use of fossil fuels has effects such as the production of carbon dioxide. One of the sources of renewable energy is solar energy. In this thesis, the calculations and design of the solar collector, which is used in seawater desalination processes, is discussed. After examining various materials such as black mulch, copper, aluminum and asphalt, asphalt is used as a solar absorber due to its suitable absorption coefficient, abundance, good price and energy storage capability. The temperature distribution inside the asphalt layer is calculated and it is tried to reduce the heat loss with glass cover. Then the water temperature is calculated with energy conservation equations. Based on the mentioned specifications, the collector is made and tested. According to the results of the test in the afternoon (13:00-12:00) of Shahrivar in Tehran (7, 6 and 8 of Shahrivar), the collector without glass has an efficiency of 32%, the collector with one glass has an efficiency of 45% and the collector with two glasses has an efficiency of It is 57 percent.

انرژي خورشيدي , شيرين سازي آب دريا , كلكتور صفحه تخت , ضريب اتلاف حرارت , توزيع دما درون لايه آسفالت

Solar energy , Flat plate collector , Seawater desalination , Heat loss coefficient , Temperature distribution in asphalt

Mahdi Bagherzadeh Homaee

Dr. Norouz Mohammad Nouri – Dr. Mohammad Akhlaghi