A horizontal fresnel etched on the outside face of a glass tube which isolates the linear black body of a solar hot water trough. 2-3 meter long.
~Virgil P, Primary Inventor and CEO, Singapore
Very large lenses, possibly segmented for practical reasons, to make very large displays (eg. up to 6m diameter lenses).
~Tony Clynick, Engineering Consultant, London, UK
Non-spherical (e.g. elliptical, etc.) Multilens - superposition of lenses. Off normal axis.
~Fred H., Research & Development, Eagan, MN
Long, about 1meter, cylinder (linear) lenses with focal lengths 100 mm 150 mm 200 mm.
~Arne M, Sales Engineer, Stockholm, Sweden
Custom specified focal length, groove frequency, size,
~Henry J, Artist: Set Designer, Display designer, Itinerant, USA, Canada
Non imaging, no tracking solar concentrators.
~Socrates Pavis, Engineering Consultant, Athens, Greece
Complex shape for multi-purpose and multi focal use.
~Research & Development, Schlieren, Switzerland
I will be finished with my latest fresnel lens project within the next 2 weeks. I plan to go patent pending at that time. My latest prototype (Black Magic) has a ratio of one heat beam per every 8 inches. However, this is not the only factor that produces heat. The 5DH will feature one light beam per every 4.7 inches. But like I stated before, there are many other factors that can intensify the heat output. When I become patent pending, I will be at more liberty to explain these factors.
~Ricky B, Renewable Energy Inventor Entrepreneur, Piedmont, SC
Heat a Stirling H2 compressor with a magnetic flywheel incased by a coil of copper wire.
~Albert Amorino A, Hydrogen Homes USA, Oceanport, NJ
More freedom in prism shape
~Engineering, Design, Jerusalem, Israel
Aspheric off center design.
~Nils R, Manufacturer, Southampton, UK
Roll up capabilities
~Dave M, Retired medical professions, Covington, KY