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Large Fresnel lens
More considerations (very good in-depth paper) http://sleekfreak.ath.cx:81/3wdev/VITAHTML/SUBLEV/EN1/SOLRCONC.HTM- Vortexx
- Post #37
- Forum: Optical systems engineering
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Large Fresnel lens
Some considerations for inflatable Fresnel structures... http://www.nasatech.com/Briefs/Mar99/LEW16662.html- Vortexx
- Post #36
- Forum: Optical systems engineering
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Large Fresnel lens
Alternatively, all the heliostats could be placed on a floating island as well with any concentrators and the whole setup could be rotated as a whole... One possible advantage I am having in mind putting your solar furnace on water is that you could put some stirling engine in the focal point...- Vortexx
- Post #35
- Forum: Optical systems engineering
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Large Fresnel lens
Here is some good old fashioned awe inspiring engineering: http://members.aol.com/stiffcrust/pharos/lens.jpg- Vortexx
- Post #33
- Forum: Optical systems engineering
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Large Fresnel lens
About the steering issue of large Fresnel structures, The old lighthouses, bearing Fresnel lenses weighing up to 3 metric tons were able to be rotate by the push of a finger(!) because they where floating in a mercury pond. Likewise one could envision pressurized greenhouse like Fresnel...- Vortexx
- Post #32
- Forum: Optical systems engineering
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Large Fresnel lens
I think the notion of a liquid lens is very interesting... The water can be replaced with alcohol, to avoid algae and has lower density than water, Lavoisier used a giant alcohol lens in the 18th century to melt platinum. People have mentioned infavourable span to weight ratio for giant...- Vortexx
- Post #31
- Forum: Optical systems engineering
