الفهرس | Only 14 pages are availabe for public view |
Abstract This study was conducted to evaluate the performance of the photovoltaic water pumping system, through this study, the impact of the density of solar radiation, the solar panel`s temperature, system performance and component`s efficiencies, and the cost analysis, based on the results of this study, the following conclusions were obtained: Intensity of solar radiation diverses with seasons and earth`s rotation round its orb and round the sun, where the irradiation reduces in the early morning and winter (Dec.), due to the altitude angle of the sun is little and the radiation permeate a long mileage of the atmosphere, whereas in the noon and summer (June), the solar radiation increase due to the altitude angle became major, and the radiation is infiltrating a short mileage of the atmosphere. The values of area under curved of solar radiation intensity for the same days were 12905, 12587, 13018 and 14028 w/m2 , respectively. When panels temperature increments, its efficiency reduces, and once the temperature reached to the highest values over the day 41℃ in summer (June2017) and 30℃ in winter (December2016); the efficiency reduced to the least values 13.9 % and 12.4% respectively. The generated electric power (Dc power) increases with the increment in the intensity of solar radiation. June has the highest power values with average 6398 Watt, and the least values were in December with average 5755 Watt. The quantity of AC power, that consigned by the inverter is related on the quantity of input Dc power and inverter efficiency. Average daily monthly Ac power accesses 5562, 5479, 5814, 6317 watts in September, December, March, and June respectively. The increment of hydraulic power as a consequence of the increment in solar radiation intensity and the actuating pressure. The dailymediocre values of hydraulic power in September, December, March, and June accessed 3207, 3139, 3382 and 3566 watts respectively.Pump flow rate was mightily influenced by the intensity of solar radiation, whereby the hourly average discharge rate in September, December, March, and June were, 18.86, 17.65, 18.97 and 20.63 m 3 /h respectively. The pumping unit efficiency is influenced by many factors, as solar radiation, Modules temperature, and Ac power. Whereby the efficiency values in September, December, March and June amounted 55.9, 54.5, 56.8 and 63.9% respectively. Overall efficiency of the system is straightway influenced by solar radiation, but once solar radiation overtakes 900 W/m2 at noon, this is attached by an increment in temperature that negatively influences the efficiency of the solar panels and so the overall system efficiency. Recommendations: - 1) The intensity of solar radiation must be studied, then the design of PV systems should be depended on the least radiation value even that the system doesn’t pause working in the winter or when the radiation intensity is dipped. 2) Alertness to safety and safeguarding such as grounding, and superimposing of circuit breakers between the panels and inverter, between the inverter and pumping unit to safeguard the system from short circuits and blaze. 3) It is favorite to utilize solar water pumping systems inasmuch low operating and maintenance costs, and have no negative influence on the environment contrasted to conventional systems such as diesel and electricity. |