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Rank #3392 on ContentLevel 214 Comments: Comedic Genius
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|Date Signed Up:||8/12/2010|
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latest user's comments
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#75 - armwulf (06/26/2015) [-]
Making the filters larger isn't enough either.
Remember, you need to BREATHE through them, your lungs are powering them.
The human lung has enough strength to breathe our atmosphere.
Our lungs simply cannot provide enough force to filter our oxygen needs from the water.
That said- with a proper power source and a compact pump, you could have a small oxygen tank that is self-filling. That'd be extremely useful.
#79 - anon (06/26/2015) [-]
With all the electrical equipment you'll have to seal and batteries you'll need I think an oxygen tank ends up being more practical.
#81 - armwulf (06/26/2015) [-]
I'm not so sure, a small oxygen bottle is safer to store, and much lighter- it would make diving less tiring. As for electrics- you really just need an electric pump with some kind of power supply. Something that can move water in through the "Gill", and push the oxygen collected into the bottle at standard pressure. We can't breathe air that's too high or low pressure.
But something has occured to me- some fish breath passively, what if the filters didn't need a pump? You used MOTION, like some fish and sharks?
As long as you're moving, you're "Filtering" with the gills.
#82 - Capnhowdy (06/26/2015) [-]
most water still doesnt have enough oxygen in it to support a large, warm blooded mammal that is swimming vigorously to maximize flow rates.
and as for a pump to extract O2 from the water, you might as well just electrolyze the water with the amount of energy that shit takes. at lest then you'd solve the O2 volume problem.
#84 - Capnhowdy (06/26/2015) [-]
electrolysis provides the same oxygen mass per joule of energy consumed as a pump but has the benefit of no moving parts and no, it doesnt need to be very big at all. they are both silly ideas though because you need absurd amounts of stored energy. trust me, im literally an electrical engineer. invest in a SCUBA
#87 - armwulf (06/26/2015) [-]
Wait, hold the fuck up, I call bullshit.
I get it, you can calculate the amount of energy required for an electrolysis rig to generate X amount of oxygen, depending upon it's efficiency. That's simple.
But there are too many unknown quantities for you to make that assertion for a pump-gill system!
-The level of dissolved oxygen in the water (Varies based on depth, geography, latitude, temperature, salinity, and other factors)
-The efficiency of the gill (What percentage of dissolved oxygen is removed from water passing through)
-The resistance of the gill (The amount of force required to move water through the gill. More resistance requires a larger pump.)
Meanwhile, an Electrolysis rig separates water into Hydrogen and Oxygen, it's separating molecules, which is a bit different from extracting a dissolved gas from a solution!
#97 - Capnhowdy (06/26/2015) [-]
there is 1/10th the oxygen per volume in water as there is in air, best case scenario:
that means a bare minimum of 10 times the flow rate of normal breathing and of a fluid 680 times denser than air. Also, at 300kJ/mol to electrolyze water, you need about 3.5kW to produce 200g/min of O2 which is what you'd get from 300L/min of fresh water. way too much for a human but oddly pretty close to what industrial pumps consume at those volumes.
#43 - anon (06/26/2015) [-]
There's a crystal that can suck the oxygen out of a room and release it again. rt.com/news/193280-crystal-breathe-underwater-oxygen/
#41 - famkehoopers (06/26/2015) [-]
#49 - thatonecommunist (06/26/2015) [-]
There are many ways to generate leectricity from a pack on your back.
I have no idea the size of this, but in theory, if you're generating the oxygen, wouldn't that work better for staying under longer?
I know the pure oxygen dilemma is still there, but this isn't a solution to that, couldn't this be used by say, tiny scale submarines?
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