Temperature in focus

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What is the maximum temperature that can be obtained using an optical system that collects the sun's rays into focus?

Keywords: solar furnace, the second principle of thermodynamics, Stefan-Boltzmann law, luminosity.

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I live in a passive solar home I built . A long dish reflector, with water pipe to cool chips, should give El & hot water at a low cost . Sad we let all the free energy go . I live in the mid west, on a sunny day @ 10 degrees F, at about 9:30 AM my heat will shut off, till about 4:30 PM .

danoneill
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I used a WWII spot light dish to melt re-bar in about 30 sec ... started to spit beads of melted steel . About 5 ft wide .

danoneill
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Ничего себе! Как хорошо вы владеете английским!

nebulousGemini