> How about the 1800C furnace that melts sand into the silicon for the solar panel
I wonder if a process similar to that used for molten salt batteries, using reflected, concentrated sunlight, could be used to melt sand into what is needed for more solar panels, electronics etc, and use the stored energy while it cools off, essentially combining the processes? And of course for other [s]melting processes powered by fossil fuels today?
Hmm, after doing a bit of research: the melting point for saltpeter (used in molten salt storage [0]) is only 550°F, while silicon's is 2,577°F... would a reflecting solar array be able to reach those temperatures? If I'm reading this [1] correctly, you could only practically get to 3,698.33°F (really close to your example of a 1,800°C furnace) if you collected all the sunlight falling onto earth. It's got to be much worse than that though in practice, because to focus all of it onto a single point would require beaming reflections from the perimeter a long distance through air, and also around the curvature of the earth...
So, we need to build this on the moon or in orbit? Oooh, Futurama actually showed us what could go wrong here [2].
The furnaces for making crude silicon are already powered by electricity. So are the Siemens process reactors for refining silicon into solar and electronic grades. So are the Czochralski crystal pullers used to turn refined silicon into mono-crystalline boules for manufacturing wafers.
"Silicon processing: from quartz to crystalline silicon solar cells"
I wonder if a process similar to that used for molten salt batteries, using reflected, concentrated sunlight, could be used to melt sand into what is needed for more solar panels, electronics etc, and use the stored energy while it cools off, essentially combining the processes? And of course for other [s]melting processes powered by fossil fuels today?
Hmm, after doing a bit of research: the melting point for saltpeter (used in molten salt storage [0]) is only 550°F, while silicon's is 2,577°F... would a reflecting solar array be able to reach those temperatures? If I'm reading this [1] correctly, you could only practically get to 3,698.33°F (really close to your example of a 1,800°C furnace) if you collected all the sunlight falling onto earth. It's got to be much worse than that though in practice, because to focus all of it onto a single point would require beaming reflections from the perimeter a long distance through air, and also around the curvature of the earth...
So, we need to build this on the moon or in orbit? Oooh, Futurama actually showed us what could go wrong here [2].
[0]: https://en.wikipedia.org/wiki/Solar_thermal_energy#Molten_sa...
[1]: https://en.wikipedia.org/wiki/Concentrated_solar_power#Ideal...
[2]: https://www.youtube.com/watch?v=0qksm5cRtcU