GPS Newsletter
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Both can be used for solar cooking and solar hot water heating. |
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| There are two basic types of Fresnel lenses, Linear and Spot. Both lenses look identical to the naked eye in terms of the circular Fresnel pattern but a Spot lens will always appear more transparent. Spot lenses produce a very small tight beam at optimal focal length and are generally more powerful size for size. Linear lenses produce a long flat beam ranging from 1 inch high by 3 inches wide up to 1" x 12". There are the specific acrylics that are UV Stabilized. I have tested several styles for 2+ years. Linear Fresnel Lens Advantages: • Less chance of damaging equipment if liquid evaporates • Long beam can be spread the length of a pipe • Powers a Steam Engine slower but more safely Disadvantages: • More opaque due to physical nature, less light (power) transferred to project • Cannot be used for melting metals Spot Fresnel Lens Advantages: • High power heat transfer (available in Crystal Clear Acrylic perfection cutting) • Can be set to less of a focal length (ideal for cooking) • Melts copper and many other materials • Powers a Sterling Engine and Steam Engine Disadvantages: • Instant flame and work hazard • Equipment damage • Does not spread over a pipe surface evenly BUY A HUGE FRESNEL LENS |
 LINEAR FRESNEL LENS   SPOT FRESNEL LENS  |
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