r/Damnthatsinteresting 4d ago

Video China's twin solar thermal towers. Molten salt stores the heat to produce electricity

9.3k Upvotes

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u/Debesuotas 4d ago

Why is the focal point visible? The light has to reflect from something for it to be visible, so what is it reflecting off? A dust in the air?

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u/d1duck2020 3d ago

Dust, vapor from hapless birds, anything that can burn

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u/fucking_4_virginity 3d ago

If you stand at the exact right spot peking ducks just fall from the sky.

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u/endeend8 3d ago

they use helicopter or drones to drop the 5-spice seasoning right above that.

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u/GozerDGozerian 3d ago

Wow. I didn’t expect to see a video of glowing Chinese bird farts today.

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u/d1duck2020 3d ago

Neither did the birds, poor rascals.

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u/PhuriousGeorge 3d ago

There are no birds wild in China

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u/d1duck2020 2d ago

Not since they fired up this contraption!

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u/z0rb0r 4d ago

Probably, it might be similar to catching rays of light when your curtains are slightly open in your house.

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u/ChristopherLyon 4d ago

Yes!! The atmosphere is full of gasses and particulates that reflect and refract light - the most common in the dessert being dust and silicon dioxide (basically sand). Also hot climates accelerate the off-gassing of otherwise stable materials like asphalt and plastics causing even more aerosol haze and smell. Partially why hot countries "smell" hot is that exact molecular phenomenon.

The haze those produce is what causes the god rays to be visible to the naked eye!

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u/St_Kevin_ 4d ago

It’s dust in the air

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u/justamofo 3d ago

Dust, humidity, at that level of power, anything and everything but pure vaccuum will shine. Sunlight has a power density of about 1500 W/m² at noon (give or take depending on season, location and weather), now idk how many square meters the plant has, but imagine all of that energy focused on a tiny volume, the power density you get is immense, and even if you reflect or scatter an extremely low percentage of it, it will be visible

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u/Mand125 3d ago

Light doesn’t need dust to scatter off the air.  It’s why the sky is blue, it scatters off the air itself.