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Proceedings Article•DOI•

Development and experimentation on a new power free solar tracking mechanism

Mohammed Affan1, Tangellapalli Srinivas1•
VIT University1
07 Apr 2016-pp 28-33
TL;DR: In this paper, power free mechanism for a vertical axis tracking system suitable for paraboloid collectors along the earth's azimuth has been developed, where the required energy for tracking system is acquired from the stored potential energy in a spring which connects tracking wheel and foremost top of the tracking system.
Abstract: In current work, power free mechanism for a vertical axis tracking system suitable for paraboloid collectors along the earth's azimuth has been developed. The proposed tracking system does not demand any external power, as the required energy for tracking system is acquired from the stored potential energy in a spring which connects tracking wheel and foremost top of the tracking system. A Simulation study has been conducted for the moment of tracker along the azimuth from Sunrise to Sunset, by considering the geographic conditions of Vellore, Tamil Nadu, India. Simulated results are used to show with minimum tracking weights to rotate maximum tracking load. The proposed tracking mechanism is a cost effective solution with power free mechanism.
References
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Journal Article•DOI•
A review of principle and sun-tracking methods for maximizing solar systems output

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Hossein Mousazadeh1, Alireza Keyhani1, A. Javadi, Hossein Mobli1, Karen Abrinia1, Ahmad Sharifi •
University of Tehran1
01 Oct 2009-Renewable & Sustainable Energy Reviews
TL;DR: In this article, different types of sun tracking systems are reviewed and their pros and cons are discussed and the most efficient and popular sun tracking device was found to be in the form of polar-axis and azimuth/elevation types.
Abstract: Finding energy sources to satisfy the world's growing demand is one of society's foremost challenges for the next half-century. The challenge in converting sunlight to electricity via photovoltaic solar cells is dramatically reducing $/watt of delivered solar electricity. In this context the sun trackers are such devices for efficiency improvement. The diurnal and seasonal movement of earth affects the radiation intensity on the solar systems. Sun-trackers move the solar systems to compensate for these motions, keeping the best orientation relative to the sun. Although using sun-tracker is not essential, its use can boost the collected energy 10–100% in different periods of time and geographical conditions. However, it is not recommended to use tracking system for small solar panels because of high energy losses in the driving systems. It is found that the power consumption by tracking device is 2–3% of the increased energy. In this paper different types of sun-tracking systems are reviewed and their cons and pros are discussed. The most efficient and popular sun-tracking device was found to be in the form of polar-axis and azimuth/elevation types.

770 citations

"Development and experimentation on ..." refers background in this paper

  • ...[10] Hossein Mousazadeh, Alireza Keyhani, Arzhang...

    [...]

  • ...[10] reported tracking systems consumes 2 to 3 % of energy and discussed on advantages and disadvantages of various tracking systems and reported horizontal and polar axis tracking system are more efficient....

    [...]

Journal Article•DOI•
Design of a novel passive solar tracker

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Michael N. Clifford1, D. Eastwood1•
University of Nottingham1
01 Sep 2004-Solar Energy
TL;DR: In this article, a low cost solar tracker suitable for use in equatorial regions around the world is presented, which is passively activated by aluminium/steel bimetallic strips and controlled by a viscous damper.

215 citations

"Development and experimentation on ..." refers background in this paper

  • ...[7] reported up to 23% improvement in efficiency in comparison to fixed solar panels with passively activated solar trackers using aluminum or steel bimetallic strips controlled by viscous damper....

    [...]

Journal Article•DOI•
A multipurpose dual-axis solar tracker with two tracking strategies

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Yingxue Yao1, Yeguang Hu1, Shengdong Gao1, Gang Yang1, Jinguang Du1 •
Harbin Institute of Technology1
01 Dec 2014-Renewable Energy
TL;DR: In this paper, a dual-axis solar tracker was developed for flat photovoltaic (PV) and concentrating solar power (CSP) systems, which employs a declination-clock mounting system that locates the primary axis in east-west direction.

192 citations

"Development and experimentation on ..." refers background or methods in this paper

  • ...[5] proposed a dual axis solar tracking system for photovoltaic system which uses an AC motor and photo voltaic inverter with a feedback control theory along with four quadrant light detecting resistor sensor....

    [...]

  • ...[5] Yingxue Yao, Yeguang Hu, Shengdong gao, Gang Yang and Jinguang Du, “A multipurpose dual-axis solar tracker with two tracking strategies”, Renewable Energy, vol....

    [...]

Journal Article•DOI•
Design and construction of a one-axis sun-tracking system

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Soteris A. Kalogirou1•
Higher Technical Institute of Cyprus1
01 Dec 1996-Solar Energy
TL;DR: In this article, the position and status of the Sun are detected by three light-dependent resistors (LDRs), one of which detects whether the collector is focused, whilst a second resistor determines if there is cloud cover, and the third senses whether it is day or night.

125 citations

"Development and experimentation on ..." refers background in this paper

  • ...kalogirou [8] proposed a single axis tracking mechanism for solar concentrators by employing three light detecting resistors one is used for focusing of collector, second is used to check cloud cover and third is used to sense whether it is day or night, the combined result of all the three light detecting resistors is fed to the control system which helps the tracker to track the sun....

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Journal Article•DOI•
Design and Implementation of a Sun Tracker with a Dual-Axis Single Motor for an Optical Sensor-Based Photovoltaic System

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Jing-Min Wang1, Chia-Liang Lu2•
St. John's University1, Saint Joseph's University2
06 Mar 2013-Sensors
TL;DR: A novel design of a dual-axis solar tracking PV system which utilizes the feedback control theory along with a four-quadrant light dependent resistor (LDR) sensor and simple electronic circuits to provide robust system performance is proposed.
Abstract: The dual threats of energy depletion and global warming place the development of methods for harnessing renewable energy resources at the center of public interest. Solar energy is one of the most promising renewable energy resources. Sun trackers can substantially improve the electricity production of a photovoltaic (PV) system. This paper proposes a novel design of a dual-axis solar tracking PV system which utilizes the feedback control theory along with a four-quadrant light dependent resistor (LDR) sensor and simple electronic circuits to provide robust system performance. The proposed system uses a unique dual-axis AC motor and a stand-alone PV inverter to accomplish solar tracking. The control implementation is a technical innovation that is a simple and effective design. In addition, a scaled-down laboratory prototype is constructed to verify the feasibility of the scheme. The effectiveness of the Sun tracker is confirmed experimentally. To conclude, the results of this study may serve as valuable references for future solar energy applications.

109 citations

"Development and experimentation on ..." refers background or methods in this paper

  • ...[2] Jing-Min Wang and Chia-Liang Lu, “Design and Implementation of a Sun Tracker with a Dual-Axis Single Motor for an Optical Sensor-Based Photovoltaic System”, Sensors, vol....

    [...]

  • ...[2] stressed on the trackers to find out the primary axis by utilizing a declination-clock mounting frame work in east-west direction....

    [...]

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