Water and gravity: look at this video

[MT]

Thank you for links. Just find the same idea was already suggested in 2016...
https://overunity.com/16357/cartesian-diver-generator/

[sm0ky2]

Thank you for your find!


I had not come across that thread when I created this one.
It seems they never got past the depth thing

[sm0ky2]

It seems there are 2 solutions:
We can ignore it, and keep our test devices within the height constraints


Or:


We can enclose the buoyant vessel.


At some point we might just buy a submarine and tie it to a generator cable
Because we are reinventing so many wheels


However, in milling several of those wheels in my head i have a few ideas:




Heres one:


If PV truly = nRT


And we maintain a relatively constant temperature....


An air hose could protrude up from the bottom of the tank and inject air into the "eye dropper"
then allow that air to then escape.


The pressure of the working volume would catch all the energy in/out
and we would have a direct buoyancy switch without needing to compress the entire outer chamber

[MT]

They are surely more ways how to  utilize potential gain but unfortunately there is no gain. Was doing a bit of calculations.
This idea is based on assumption that we can retrieve all energy that we spent on compression. Yes, we can retrieve all energy during decompression when the diver is at the top but thats not possible when he is at the bottom. 


Problem is with air bubble in the diver. Suppose that diver is at the top and we compress its air bubble so its volume got one liter smaller spending energy E. With diver at the top the same amount of E is needed to regain that one liter of volume. But when diver is at the bottom with higher water pressure using only E will not regain one liter of volume, it will be less. To get it inflated to original volume extra work is needed and this work is exactly (in ideal system with no losses) what could be possibly gained from diving motion to bottom.