المجلة الدولية للعلوم والتقنية

In this paper, the design and development of an equivalent dish (center) for heating water using available materials was presented. Comparative studies were conducted for reflective and absorbent surfaces, and the best of them was chosen to form the solar concentrator unit. Solar concentrator units were installed in the College of Science, Al-Ajilat - Libya, and center variables such as two temperatures were measured. The entry and exit of water, the intensity of direct radiation on the center opening, and the environmental variables surrounding the center such as ocean temperature and wind speed, and the flow rate was fixed at “L/h 15” The period of measuring the variables lasted for 6 months, and the available energy, the extracted energy, and the instantaneous, hourly, and daily efficiency of the solar center were calculated. At every quarter hour of the measurement hours, it became clear from the measured quantities that the variables change with the change in the intensity of the solar radiation falling directly on the center, where it takes the value. The maximum is at noon. It was also noted that the average efficiency for the day for a moving center was (29)%, compared to the fixed center, which was (6)%, and as for a glass-coated pipette, the efficiency was (39)% Compared to the absorbent without a coating, which was (30)%, and the absorbent coated with epoxy (49%), compared to the other types of coatings, which were (45,39,28) respectively, and for the mirror reflector, the efficiency was (58)%, and compared to the following reflectors, which were ( (47.41%). It was also noted that the temperature of the hot water reached (100℃), and from the results, in order for the center to give the largest amount of heat, it must follow the movement of the sun, and the absorber must be surrounded by a glass casing, and painted with a selective paint such as epoxy..................... Keywords:.............. water heating, reflective and absorbing surfaces, solar concentrators, solar motion, water temperature.