This paper presents a comprehensive review on solar tracking systems and their potentials on Photovoltaic systems. The paper overviews the design parameters, construction, types and drive system techniques covering myriad usage applications. The performance of different tracking mechanisms is analyzed and compared against fixed systems on Photovoltaic cell, module, panel, array, and systems. Analysis showed major discrepancies of tracking moods against fixed systems (8%:85%) based on many factors such as weather, tracking type, location, and application itself. This review is helpful for researchers and engineers to overview the whole systems designs and the most beneficial to their usage.

Tracking system

Tracking (education)

Solar tracker

10.1109/pvsc.2018.8547901

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Citations (15)

Solar tracking systems: Technologies and trackers drive types – A review

Renewable and Sustainable Energy Reviews (2018)

A.Z. Hafez A.M. Yousef N.M. Harag

Tracking (education)

BitTorrent tracker

Solar tracker

Tracking system

10.1016/j.rser.2018.03.094

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Citations (271)

Energy harvesting systems: Technologies, applications, designs, and simulation models | The reality and the challenges.

A.Z. Hafez

This paper aims to show and classify the various types of energy harvesting technologies, and find out the potential pros and cons from the existing energy harvesting techniques with different applications. There are many energy-harvesting systems discussed in the review that depend on the source of energy are for example solar, human, flow, microbial, micro-algal and fuel cell, microwave, ultrasonic, wave, offshore, rainwater, thermal, hybrid, mechanical and vibration energy harvesting. The number of references analyzing in the context of the design but the research highlight the most attracted software programs and mathematical techniques that the researchers used it on their research. In addition, the review showed a wide range of different energy harvesting applications where these applications are categorized with respect to each source that will lead us to understand that there are some type of the sources are more suitable to specific applications. The storage systems also showed with respect the points of benefits and the cons where all storage systems are a real challenge till now in the energy sector because its defects on many applications and different conditions of operations. The reality and the future challenges are characterized according to the potential of applications with respect to the various energy harvesting systems.

Rainwater Harvesting

Energy source

Source

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Comparative evaluation of optimal energy efficiency designs for solar tracking systems

A.Z. Hafez J. H. Shazly Magdy B. Eteiba

The aim of this paper is to present a way in which the efficiency of solar power collection can be increased. A new design idea of a one axis tracking PV module using solar-powered Stirling engine as the power source for the tracking motor was proposed in the present study. Every PV module is mounted on an individual sun tracking frame. The new systems designed here provided good power output performance. The optimum PV-tracking axis is the E–W that corresponds to the maximum possible power. The power of PV equipped with an E–W sun-tracking system using solarpowered Stirling engine gave much better performance than that of fixed PV systems. Azimuth tracking using solarpowered Stirling engine increased annual solar irradiation incident on a surface relative to a fixed south-facing surface at optimum tilt angle. An analytical model to simulate the thermal behaviour of the solar-powered Stirling engine prototype is proposed and validated. The results are shown using simulation and virtual reality. The site of application is chosen at Giza, Egypt (31o North, 30o East). Keywords—Photovoltaic, Tracking, Stirling Engine, Efficiency.

Solar tracker

Tracking (education)

Tracking system

Solar Power

Maximum power principle

Solar micro-inverter

Source

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Citations (4)

Design analysis factors and specifications of solar dish technologies for different systems and applications

Renewable and Sustainable Energy Reviews (2016)

A.Z. Hafez Ahmed Soliman K.A. El-Metwally Ibrahim Ismail

Parabolic reflector

Concentrator

Reflector (photography)

Aperture (computer memory)

Acceptance angle

Nonimaging optics

Stirling cycle

10.1016/j.rser.2016.09.077

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Citations (130)

Tilt and azimuth angles in solar energy applications – A review

Renewable and Sustainable Energy Reviews (2017)

A.Z. Hafez Ahmed Soliman K.A. El-Metwally Ibrahim Ismail

10.1016/j.rser.2017.03.131

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Citations (195)

Design analysis of solar parabolic trough thermal collectors

Renewable and Sustainable Energy Reviews (2017)

A.Z. Hafez A.M. Attia H.S. Eltwab A.O. ElKousy Ahmad Afifi

Parabolic trough

10.1016/j.rser.2017.09.010

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Citations (102)

Simulation, design and thermal analysis of a solar Stirling engine using MATLAB

Energy Conversion and Management (2014)

J. H. Shazly A.Z. Hafez E.T. El Shenawy Magdy B. Eteiba

Prime mover

Heat Engine

Stirling cycle

Working fluid

10.1016/j.enconman.2014.01.001

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Citations (36)

PARASITIC INFECTION IN PREGNANT WOMEN PRESENTED WITH ANEMIA IN FAYOUM GOVERNORATE, EGYPT

Fayoum University Medical Journal/Fayoum University Medical Journal (2020)

AA Abdelsamie EMH Mèabed WS Deeb A.Z. Hafez

Anemia is prevalent among pregnant women in developing countries and is associated with poor pregnancy outcomes.This study aims to assess the prevalence of parasitic infection in anemic pregnant women in Fayoum governorate, Egypt, and to estimate the effect of administration of anti-helminthic drugs on anemia with pregnancy.This study may lead to suggestions on how to better prevent and control anemia during pregnancy.The study was performed from June 2017 to November 2019 at the antenatal care clinic in the Department of Obstetrics and Gynecology of Fayoum University hospital.In this study, 800 pregnant women were screened for anemia and this revealed that 200 pregnant women were found to be anemic.Then the anemic patients were examined for parasitic infections and this revealed 2 groups, anemia group included 92 anemic pregnant women received iron only and Anemia with parasites group included 108 anemic pregnant women with parasitic infections.This group is subdivided into 2 equal subgroups: group received iron only and another group received (iron + anti-parasitic treatment).In the present study, the prevalence of parasitic infections in anemic patients was 54%.This established an association between intestinal parasitic infections and anemia during pregnancy.The severity of anemia in these cases ranged from mild to moderate to severe anemia.before treatment, 7% were mild, 78% were moderately, and 15% were severely anemic.While after they received treatment with iron and anti-parasitic treatment, 93% were mildly anemic, and 7% were moderately anemic.

10.21608/fumj.2020.173410

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