الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The present study is carried out to achieve higher efficiency of a PV system in addition
to reducing the cost of energy generation. Using two different systems to achieve the maximum
benefit. The first system is to investigate cooling effect on the thermal and electrical
performance of the polycrystalline photovoltaic modules. The thermal and electrical
performance of the modules is theoretically modeled and validated with experimental results.
The second system is using concentration photovoltaics to enhance the efficiency of the PV
system and simultaneously reduces the cost and size of electricity generation devices. For this
purpose, a V-trough integrated with low concentration PV system is employed (LCPV). Since
the electrical output of the concentrating PV system is significantly affected by the temperature
of the PV cells, different cases studied of this system illustrated, using hybrid concentration
and different cooling techniques for PV cells to achieve the maximum benefit. Due to increase
in the absorbed radiation the module temperature is also increased which is predicted by
thermal model. Active cooling techniques and the performance of V-trough modeling are
studied and carried out to obtain maximum electrical power of PV modules. The numerical
study is executed for achieving the actual thermal analysis for the temperature distribution on
PV module using ANSYS Mechanical APDL Thermal Analysis and TRNSYS commercial
programs.
Typical results of the change of total solar radiation intensity on PV/T collector surface
measured during the sun peak on March and August in Egypt depending on the positions of
reflectors. from results of solar incidence, α1 denotes the angle between bottom reflector and
horizontal plane, and α2 denotes the angle between upper reflector and vertical plane. The
values of the optimal positions of upper and bottom reflectors for given tilted plane angle β=30,
experimental measurements indicated that optimal angle position of the upper reflector α2 to
be the range of (5 ~ 15) and the angle position of the lower reflector α1 to be 35°.
Experimental and Numerical results investigate water cooling presents a good
alternative to air cooling using coolant making a more efficient utilization of thermal energy
captured. Water collector of PV system is more favorable in temperature distribution on the
surface of PV modules as it presents less temperature fluctuations compared to air-based PVT,
low temperature has been practically investigated and presented better performance.
Thermal performance analysis of different designed configurations namely Spiral flow,
oscillatory, Direct and web flow, air collector heat exchangers used in hybrid solar PV/T
system. The study presents a numerical approach of the reduction of temperature of the
photovoltaic panel. The numerical model is realized using ANSYS-Fluent software for laminar
and turbulent flow and the results are presented heat transfer is recorded for the web flow
serpentine design as the minimum temperature of the photovoltaic is recorded for this case.
Applying cooling impact in PV system, the power of the simple PV panel is increased
by 19.7% and for the V-trough by 23.5%. Investigation indicate a good agreement of results
by measuring at any time of the year during sun rise. It is concluded from the results that
a V-trough PV system with cooling has more benefits than the normal flat PV system and
hence, V-trough PVs are recommended for enhancing electric power generation.