/sci/ - Science & Math

>>10806709
either change the rotor direction, have seperate inlet and outlet pipes, or have bidirectional turbines

>>10806709
You can change the direction of the current by flipping the wires

>>10806717
I have a model of it in my backyard but I cant harness any energy

>>10806709
The moon is really big and it pulls on everything on the earth. Most of earth stuff is solid so the moon doesn't move it much but water is liquid so it moves really easily. Not only that but it creates a huge slow wave that we call tides. By focusing one of these waves by, lets say, using a small inlet to a large bay, you can turn the slow waves into relatively quick flow and then in turn harness that energy using turbines.

>>10806709
water spins fan, make electricity

what you've created is a dam that can refill itself by tidal energy

The power output a dam dependent on it's head (height the water travels vertically) and it's flow rate (how much water passes through the dam)

the problem with your damn is it's extremely how head. Only as high as the tides go up and down. So the only way to generate power is with an extremely high flow rate. You'd need to take up a HUGE amount of coastal real estate to generate any substantial power.

what you've created is a dam that can refill itself with tidal energy

The power output a dam dependent on it's head (height the water travels vertically) and it's flow rate (how much water passes through the dam)

the problem with your damn is it's extremely low head. Only as much as the difference between high tide and low tide. So the only way to generate power is with an extremely high flow rate. To get that flow rate you'd need to take up a HUGE amount of coastal real estate to generate any substantial power.

>>10806810
however just to add,
if you did manage to get enough coastal real estate, it would produce substantial power.
It'd be a good solution for islands like Puerto Rico where power generation is a constant problem. Although their coast is necessary for their tourism, which is extremely important for Puerto Rico. You'd have to do some number crunching to determine the exact feasibility of it but in theory it has potential.

Try this on for size

>>10806848
You need to be at least 18 to post on this website.

>>10806810
>>10806843
just had a crazy idea
If the amount of power it generates is dependent on the size of the coastline it occupies, is there anyway you could utilize the infinite coastline paradox for unlimited power???

>>10806736
This is the correct answer.

>>10806880
No.

>>10806887
you're no fun

>>10806896
You're not very smart are you?

>>10806900
I was hoping for someone who believed that troll physics could actually work. Woulda been more fun.

>>10806880
yes, you just need to invent an infinitesimal turbine that produces finite power

You just need to dig out a cavern in a cliff face or build very long reservoirs along the coastlines. You'd also have to build it in a place with a large tidal difference. There's a place in Canada, I think near the Alaskan coast, which gets tidal differential of like ~15 meters; that would be a great spot, because you'd get a large volume of water and good flow. At high tide, you open up your intake doors, the water rushes in, turning your intake turbines and filling up the reservoir; when the reservoir is filled up, close your intake doors. When the tide falls low enough, you open up your outtake doors and it all all flows out, turning the outtake turbines.

Problem is, sea level keeps rising, so you need to build the thing much taller than it needs to be (might even need to make the positions of the intake/outtake adjustable somehow; maybe use big vertical sliding slabs?), and it would be a huge eyesore for coastal areas. If you don't build it right, it would be useless after several years.

>>10806908
https://www.nature.com/articles/530256e
>Chemists have generated electricity from water by passing it through a material containing atom-thick sheets of carbon.

Now just need to engineer an artificial sea wall that is 1 atom thick

>>10806918
The turbine would work underwater. As long as there's a change in tide it works fine.

jesus christ, can they really not build something more efficient than this? Engineering has really gone downhill

>>10806929
It would spin very slow if you're simply relying on the tidal forces. That's not a very good power source. The one I suggested would work more like a traditional hydroelectric dam and generate much greater power. For the sake of argument, imagine a 15 meter high, 5 kilometer long reservoir; put the intakes a bit below the high tide line, and the outtakes a bit above the low tide line. Emptying it out would generate a very good amount of power; filling it up, not so much, but every bit counts.

Could also use them as a companion to desalination plants; with the changing climate, we're certainly going to need them, and they do chug a lot of power.

>>10806946
>efficient
This word doesn't mean what you think it means

>>10806736
if you spin a generator in the reverse direction then voltage polarity will change.
Depending on the converter type control my varu, but generally the polarity makes no difference in an AC generator since the current polarity would shift along with the voltage. you just have to adjust the control scheme for the particular converter hooked up to the turbine.
t. electrical engineer with a masters thesis in AC generator design

>>10806958
you need the tide to flow over your motor twice a day, I think you could use some design improvements.

>>10807003
>motor

>>10806957
What about simply using heat to desalinate salt water? There is a lot of heat in iceberg, more than in boiling sea.

>>10807029
boiling lake.

But if we apply kirnhoffs law, we cannot generate elektricity from anything, therefore I have no idea.

>>10807029
>What about simply using heat to desalinate salt water? There is a lot of heat in iceberg, more than in boiling sea.
Are you retarded?

>>10807033
Tell me kilojauls of boiling lake and kilojouls of iceberg, big iceberg, all you need is colder point and energy flows, it's like having "air pump" it works outside of pressure too, like in temperature.

>>10807827
let's just go straight to the sun made of fire and sun made of ice