Now imagine this 27 foot wide ball shooting water out of its bottom while on the sea floor and tell me there's still no silt being stirred up. Or algae. Or mineral buildup.

[–] Bad_Engineering@fedia.io 2 points 22 hours ago (1 children)

That's why I said siphon it from the bottom, a siphon tube going from the bottom to the top would eject the water up and away while still sucking out most of the sediment that had gotten in and settled on the floor of the ball.

[–] fishos@lemmy.world 1 points 15 hours ago* (last edited 15 hours ago) (1 children)

The sediment that gets pushed out into the surrounding water. That gets pulled up with the ball as it creates negative pressure behind it as it rises.

Bro, the ocean is FILTHY. Like, crazy filled with stuff. Like, you could take a coffee filter and pull stuff out filthy. Like the water has so many living organisms in itself it's basically alive.

And let's talk about the salt. Corrosive af salt.

This isn't impossible, but the people trying to point out why this is CRAZY difficult are right. This will not be a set it and forget it scenario by far. It will need regular maintenance. The issue is whether that maintenance is easier or harder than a dam or stationary tank.

Like, why can't we build these in giant freshwater reservoirs? Stick them a pool. Or why does it need to float? Wouldn't a tank at the bottom of a pool with a pump do the same thing? Or two tanks at different heights with a conection between them and a pump? This is just mechanical energy being stored for later. Do the work when it's cheap and reclaim it later.

[–] Bad_Engineering@fedia.io 1 points 1 hour ago

They don't float, they're fixed in place at depth. They use the pressure of the surrounding water to spin a turbine as its pumped in and out, the only moving parts are the turbine and its associated components. And seeing as how the water is pumped in and out, most of the silt/detritus pulled in during filling, would be pumped out during draining assuming a siphon tube is used to draw the water from the bottom of the sphere (where all the debris settles) to the pump.

Yes salt water is corrosive, but that problem is already solved, there are currently concrete oil platforms built in the 70s and still in service today. We have formulas for concrete that are proven to be seawater resistant.

Building storage tanks on land wouldn't be as efficient due to the greater pressure differential at 500m underwater vs on land. Dams are one of the most expensive structures to build and are very damaging to the surrounding environment. They also have a much larger problem with silt deposition as there is a constant flow of it, every time it rains there's another surge of silt making its way downstream to be trapped by the dam.

Overall this project would be considerably cheaper, more friendly to the environment, and most likely more efficient than any pumped storage on land. And its not like the sea floor is lacking for real estate, unlike any feasable locations for dams here on land.