solar panel lenses

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Concentrating solar collectors are used when higher temperatures are required. Solar energy falling on a large reflective surface is reflected onto a smaller area before it is converted into heat. Mostly concentrating collector can only concentrate the parallel insulation coming  directly from path the sun’s disk(beam normal insulation) and must follow(track) the sun’s  path across the sky. Parabolic dishes, central receivers and Fresnel lanes.

A central receiver system consists of a larger field of independently move flat mirrors (heliostat) and a receiver located at the top of a tower. Each heliostat move about two axes, throughout the day, to keep the sun’s image reflected onto the receiver at the top of the tower. The receiver, typically a vertical bundle of tubes, is heated by the reflected insulation, thereby heating the heat transfer fluid passing through the tubes.

A parabolic trough concentrates income solar radiation onto a line running the length of the trough. A tube (receiver) carrying heat transfer fluid is place along this line, absorbing concentrated solar radiation and heating the fluid inside. The trough must be tracked about one axis.

A Fresnel lens concentrator uses refraction rather than reflection to concentrate the solar energy incident on the lens surface to a point. Usually molded out of inexpensive plastic, these lenses are used in photovoltaic concentrator. Their use is not to increase the temperature, but to enable the use of small, higher efficiency photovoltaic cells. As with parabolic dishes, point-focus Fresnel lenses must track the sun about two axes.

In general, flat-plate photovoltaic panels are mounted in a fixed position and tilted toward the south to optimize noontime and daily energy production. However, it is common to see flat-plate photovoltaic panels mounted on mechanisms that track the sun about one tilted axis, thereby increasing the output of the panels.

About the Author:

Timothy Kolawole has helped different people get information about solar energy for their homes. For more FREE report, visit: Solar-energy-solution.com

Article Source: ArticlesBase.com – Concentrating Solar Power Collectors

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