المجلة الدولية للعلوم والتقنية

This research deals with a practical study to improve the productivity of the planar solar collector by modifying the design to study some of the physical properties of a solar collector with two glass covers, as a solar collector with two glass covers was designed to reduce the process of loss in solar radiation and to preserve the largest amount of solar radiation inside the collector and then connect the collector with thermally insulated tank by insulated tubes and the circuit was called "the system" and the system was installed on a solid base that tilted at an angle of 32.5ͦ at the horizontal level towards the south.( College of engineering Technology –Janzour-libya) The temperature entry and exit of the system from the clock (9: 00AM ___ 14:00 PM) for several days and for a period of three months, and the study period began from (4/2019 -6/2019 ) when we calculated the total thermal energy of the system through the equations for solar energy and then the results are discussed according to the climatic and weather conditions for the months previously specified, with the graphic representation in the excel program, and the inclusion of the values in the tables shown in numbers for each month, and then a conclusion is drawn from the graphical relations and it is clear through its predecessor proved that the system gave acceptable results for a solar collector with two glass covers compared to previous studies for a solar collector with one glass cover, where we took solar radiation data for the above-mentioned period from the "Research Center for Renewable Energies and Desalination – Tajoura-libya ", as well as compared The results obtained from the system with previous studies, where it gave the largest thermal energy from a system with one glass cover, and the explanation of this due to a difference in design, as the rate of flow in the system is faster when the temperature is higher, which harms the rise of water to a higher because of its lower density and thus speed. The process of natural flow of water and the heating process take place in the system.