EXPERIMENTAL ANALYSIS OF THE THERMAL PERFORMANCE OF TWO SOLAR COLLECTORS MODELS UNDER EGYPTIAN CONDITION

The thermal performance of two solar collectors (batch system) was experimentally tested. Experiments were carried out during seasons of 2015 and 2016 at Faculty of Agriculture, Zagazig University, Egypt. In January, inlet water temperatures for both models January, inlet water temperatures for both models were around 17 ᵒC , and outlet temperatures were 27 and 23ᵒC for models A and B respectively, while in July, inlet water temperatures for both models were around 35 ᵒC, and outlet temperatures were 55 and 49ᵒC for model A and B respectively. Obtained results show that model (A) can rise water temperature higher than model (B) almost throughout the year. Energy collected varied between 655 and 335 W for models A and B respectively in January and 1955 and 975 W for models A and B respectively in July. However, The monthly average energy losses varied between 380 and 180 W for models A and B respectively in January and 1090 and 360 W for models A and B respectively in July. The average system efficiency varied from 43% to 50% in January for models A and B respectively while the system efficiency varied from 44% and 63% in July for models A and B respectively.