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  1. Heatseeker

    Scrap Metal and Market

    Salvatio, in nonferrous scrap the specifications issued by the ISRI in the US are pretty much world standard, you may want to check them at www.isri.org. Inthe Us a good guide to metal price is AmericanMetal Market and Platts who offer paid subscription to fairly up todate prices.
  2. Heatseeker

    Large Fresnel lens

    Thanks everybody. Need to do some work with the info you gave me and will be back whenever there is news. Please feel free to continue the discussion.
  3. Heatseeker

    Large Fresnel lens

    Dust needs to be removed - true. As an ongoing operation - what is easier - cleaning a acrylic dome or a field of mirrors plus (if required) the mirrors of the concentrator? To SolarDave - can you point to a source for mechanical property data on acryl?
  4. Heatseeker

    Large Fresnel lens

    To Solar Dave - is that outdoor stability measurable in months or years, is it comparable to mirrors? To nbucska (Electrical)- to my view mirrors are expensive and unlikely to get less expensive, if compared with Acryl the cost factor for the same collection surface seems to be 1:2 in favour of...
  5. Heatseeker

    Large Fresnel lens

    Thank you all for providing thoughts. To answer questions and post some final ones: + The application requires solar energy from about 5000 squm + It could, if built inexpensively enough be replicated several hundred times to IRstuff What is your experience with sunlight exposure of PC or...
  6. Heatseeker

    Large Fresnel lens

    nbucska - no I have no idea. It would depend on the support construction, focal length etc one chooses I think. jeanpaul - thank you for the idea. Is this, on a smaller scale perhaps, being done already?
  7. Heatseeker

    Large Fresnel lens

    nbucska thank you for the advice. questions is what is really cheaper?
  8. Heatseeker

    Large Fresnel lens

    Brainstorming - for an solarthermal application. If it is possible, who knows more about that. I agree it would be a statics nightmare if one would make this a monolithic structure. But if one uses a structure like those made by Sprung Instant Structures and replaces the stressed membrane...
  9. Heatseeker

    Large Fresnel lens

    Is it possible to build a Fresnel lense with an diameter of 50 - 60 metres, maybe assembled in a frame/patchwork style construction? Maybe somebody already did this - are there any references?
  10. Heatseeker

    Oval Tubing

    Good day everyone. Would anyone know of a mill or distributor who handles STOCK sizes of oval or obround carbon steel (1020/1026) tubing. Let me eliminate 90% of your responses before-hand by saying that a custom run is out of the question, I only need a couple 100 feet of two sizes. Thanks...

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