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Research Papers

Design, Construction and Evaluation of a Sun-Tracking System on a Mobile Structure

[+] Author and Article Information
Hossein Mousazadeh1

Department of Agricultural Machinery Engineering,  University of Tehran, Karaj, 31585–77871, Iranhmousazade@gmail.com

Alireza Keyhani

Department of Agricultural Machinery Engineering,  University of Tehran, Karaj, 31585–77871, Iranhmousazade@gmail.com

Arzhang Javadi, Ahmad Sharifi

 Agricultural Engineering Research Institute (AERI), Karaj, 31585–77871, Iran

Hossein Mobli

Department of Agricultural Machinery Engineering,  University of Tehran, Karaj, 31585–77871, Iran

Karen Abrinia

Faculty of Mechanical Engineering, College of Engineering,  University of Tehran, Karaj, 31585–77871, Iran

1

Corresponding author.

J. Sol. Energy Eng 133(1), 011003 (Jan 24, 2011) (6 pages) doi:10.1115/1.4003296 History: Received June 15, 2010; Revised December 05, 2010; Published January 24, 2011; Online January 24, 2011

Although using sun-trackers are not mandatory in PV systems, their application improves the efficiency and maximizes daily collected energy. To maximize collected energy from an on-board PV array, on a solar assist plug-in hybrid electric tractor (SAPHT) a sun-tracking system was designed and installed. Considering the mobile structure above the SAPHT, designing a time and date independent sun-tracker was desirable. Using four light dependent resistive sensors a sun-tracking system on a mobile structure was constructed and evaluated. Using the designed sun-tracking system, the experimental tests illustrated that 30% more energy was collected in comparison to that of the horizontally fixed mode. Only 1.8% of all maximized energy is consumed by actuators of the designed tracking system. However, the developed sun-tracking system is robust and inexpensive and showed acceptable performance during experimental tests.

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Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

The array on the SAPHT is following the sun

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Figure 2

Global horizontal radiation in Karaj (Iran) (NASA site accessed at December 2009)

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Figure 3

Basic elements of the evaluated PV system

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Figure 4

The circuit of designed sun-tracker

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Figure 5

Flowchart of the designed sun-tracker

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Figure 6

Collected power data in the fixed mode of arrays

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Figure 7

Comparison of tracking power curve versus fixed mode

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