By using reflecting materials like aluminium foil, chrome, shining steel etc the solar radiations are reflected and concentrated to increase the temperature.
Depends on the optical setup, the application, and the materials used. Right now, CSP towers reach 565 C and CSP trough system reach 400 C. Point focus systems can reach higher temperatures because the receiver has less area, so lower thermal losses. I'm not sure what the theoretical maximum is, but the high temperatures now are limited by the heat transfer fluid (nitrate salts for towers) and containment materials. The goal for the next generation towers are looking more towards 750 C and troughs towards 565 C. Temperatures can get hotter than this, but its quite expensive to do so and unproven for long-term use, depending on the application. The numbers I gave are current technologies for power generation. There is a dish design for a solar furnace that goes up to 3,500C
Why not use a Fresnel lens to concentrate the rays rather than reflection? In that way you can melt glass: https://www.youtube.com/watch?v=xyCH2T5PWUc
Dear Abdul,
In my understanding, An optical system create an optical replica. And the origin of the sun light is a black-body radiation from 6000K sun surface. It means the theoretically attainable temperature of the replica is the temperature of the light source. Hence, it is 6000K. Further concentration of the light is impossible; it is a fundamental of the optics.
For the case of laser beam, it is unlimited.
Thanks dear Rawle for providing me very valuable information. Hopefully, the use of Fresnel lens will be the complete solution of my project. I am very much thenkful to you and I will stay in touch with you.
With gracious regards.
DR. KHAN
Dear Alan F Rawle:
Which type of TV contain Fresnel lens?either LED TV, LCD TV, Glass tube TV, projection TV.
I have dismental glass tube TV, LCD computer screen but did not find Fresnel lens.
Regards.
DR, KHAN
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