الفهرس 
REVIEW OF LITERATUREOnly 14 pages are availabe for public view
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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.