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Register a new userStudying the effect of solar radiation intensity on the performance of water pump run by Solar Energy in Lattakia
دراسة تأثير شدة الإشعاع الشمسي على أداء مضخة مياه تعمل بالطاقة الشمسية في اللاذقية
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يهدف البحث إلى الاستفادة من الطاقة الشمسية كطاقة مجانية لتشغيل مضخة مياه تعمل بالطاقة الشمسية و دراسة تأثير شدة الإشعاع الشمسي على أداء هذه المضخة في ظروف الساحل السوري. تم شرح آلية تحديد استطاعة المضخة اللازمة و الاستطاعة الكهربائية للألواح الكهروشمسية اللازمة لعمل المضخة و مساحة هذه الألواح. كما تم دراسة تأثير شدة الإشعاع الشمسي على أداء مضخة المياه من خلال دراسة أثر ارتفاع الضخ و شدة الإشعاع الشمسي على معدل تدفق الماء في موقع التجربة. بينت الدراسة بأن تدفق المضخة يمر بمرحلتين مع ازدياد قيم الإشعاع الشمسي خلال اليوم. حيث تبين أن تزايد قيمة تدفق المضخة قبل قيمة (520W/m2 ) للإشعاع الشمسي أكبر منها بعد (520W/m2)، و هذا أدى إلى ضياع جزء من الطاقة الشمسية الساقطة خلال اليوم خاصة في الأيام المشمسة، و بلغت قيمة هذا الضياع حوالي (27%) من كمية الطاقة الشمسية الكلية الساقطة في اليوم.
The research aims to take advantage of the solar energy, as a free energy, to run a water pump powered by solar energy, and to study the effect of the intensity of solar radiation on the performance of this pump in Syrian coast conditions. This research has explained the necessary mechanism for determining the capacity of the pump and the electric PV panels required for the work of the pump and the area of these panels. Studying the effect of intensity of solar radiation on the performance of water pump through studying the impact of pump altitude and solar radiation intensity on water flow range at experiment location. It demonstrated that the flow of the pump is going through two phases with the increasing values of solar radiation during the day. It was found that the increasing value of the flow of the pump before the value of (520W/m2) of Solar radiation was greater than that after (520W/m2) and this led to the loss of a part of the solar energy falling during the day, especially on sunny days, and the value of the loss was about (27%) of the total amount of solar energy falling per day.
References used
(Scientific Studies and Research Senter (SSRC
STOKES, K. ; SAITO, P. ; HJELLE, C. Guidelines for Livestock Water Pumping . Sandia National Laboratories report, SAND93-7043, 1993
BROWN, L. using solar energy to pump livestock water . British Columbia, Order No. 590.305-6, 2006
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This research aims to study the effect of the tilt angle of PV panels on the daily discharge a water pump powered by solar energy, and to determine the optimal tilt of these panels during summer months in the Syrian coast.
The results demonstrated t
hat the change of the tilt angle of PV panels from (25˚) to (35.5˚), has no effect on the curve of the solar radiation intensity and flow rate. However the resulting impact was represented by low amount of solar energy falling onto PV panels, resulting in a reduction in hydraulic energy of the pump and consequently low flow rate per day. The study showed that the amount of water flow rate at the two angels (25˚ and 22˚) for the tilt of panels was close, with preference for the angle (22˚). Reduction of water amount from one month to another during the months (June, July, August) didn't exceed (2.5%), while it was (7.5%) in September. At angle (35.5˚), water amount was approximately constant during June, July and August, while it decreased by (6%) in September. Flowing water largely decreased at angle (35.5˚) in comparison with the two angles (25˚and 22˚), so the reduction was (13, 12, 9 and 7.5%), respectively in June, July, August and September.
This research includes a detailed study of the daily and monthly
changes to the intensity of total solar radiation in the city of Homs
(34.75N °, 36.7 E °), and a direct measurement of the intensity. The
study shows that intensity increases to max
imum values in summer
1100w / m2, and drops to lesser values in winter 600 w / m2. The
difference between the measured values in summer and winter is
due to: a change in the inclination of the sun, and implicitly solar
azimuth z. This angle is at its greatest in winter and the optical
path is at the maximum. Thus, the processes of scattering and
absorption increase. In summer, the inclination angle is at its lowest
and the optical path is at the minimum. Thus, the absorption and
scattering of solar radiation are at the minimum.
Modeling solar radiation consider one of important and helpful
matter in researches in generation an electric power from solar
cells.
Researchers interested in this subject and put number of
mathematical models to modeling solar radiation.
In th
is paper we will study one of this models (cloudiness degree
model), then put algorithm for it, and based on it writing program
using mathlab, then comparing this results with real value taken
from position in Syrian Arabic.
The basic idea of the research is to deal with the problems facing
floor solar heating systems (high Constituent cost, huge size of the storage tank, difficulty
of implementation ...)in addition to fuel consumption. Despite the use of solar energy
for
the purpose of heating, that does not mean full dispensing for heaters assistance in order to
increase the temperature of water in the days which the intensity of solar radiation is low.
In this study، a traditional air source heat pump was modified by adding secondary
evaporator within hot water tank which acted as a water heat source of the heat pump. We
made the heat pump to run alternatively either using surrounding air heat or
water heat
gained from solar power.
We have done experiments during five months starting in December of 2014 until
April 2015. Temperature and pressure were measured at specific points of the cycle. Then
we defined the enthalpy at each point for both cycles using EES software (which is a
software to simulate thermodynamic elements)، and calculated the amounts of heat gained
in the evaporator، heat charged from the condenser، compressor work، coefficient of
performance ، and electrical power consumed by the compressor.
Then we made a compare between the two cycles and found that the improvement
ratio in of the modified cycle to the traditional cycle was 77.07%، and the reduction
ratio in electrical power consumed by the compressor of the modified cycle was 33.54%.
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