Underwater Breathing System
An Israeli Inventor (Alan "Alon" Bodner) has developed a breathing apparatus that will allow breathing underwater without the assistance of compressed air tanks. This new invention will use the relatively small amounts of air that already exist in water to supply oxygen to both scuba divers and submarines. The invention has already captured the interest of most major diving manufacturers as well as the Israeli Navy.
An Israeli Inventor (Alan "Alon" Bodner) has developed a breathing apparatus that will allow breathing underwater without the assistance of compressed air tanks. This new invention will use the relatively small amounts of air that already exist in water to supply oxygen to both scuba divers and submarines. The invention has already captured the interest of most major diving manufacturers as well as the Israeli Navy.
The idea of breathing underwater without cumbersome compressed
air tanks has been the dream of science fiction writers for many years. In George Lucas
movie "The Phantom Menace", Obi-Wan
whips out a little Jedi underwater breathing apparatus and dives in. As things
tend to happen in our world, yesterdays science fiction has turned into today's science fact due to
one Israeli inventor with a dream.
There are a number of limitations to the existing compressed air
tank underwater breathing method. The first is the amount of time a diver can
stay underwater, which is the result of the compressed air tank capacity.
Another limitation is the dependence on compressed air refueling facilities
near the diving site which are costly to operate and are used to compress the
gas into the tanks which might be dangerous if not handled properly. The final
problem has to do with the actual use of compressed air tanks underwater. When
these tanks are in use they empty out and change the balance of the diver in
the water.
Engineers have tried to overcome these limitations for many
years now. Nuclear submarines and the international space station use systems
that generate Oxygen from water by performing 'Electrolysis', which is chemical
separation of Oxygen from Hydrogen. These systems require very large amounts of
energy to operate. For this reason, smaller, diesel fueled submarines cannot
use these systems and are required to resurface to re-supply their air tanks
every so often. Divers can't even consider carrying such large machines not to
mention supplying them with energy. To overcome this limitation an Israeli
inventor, Alon Bodner, turned to fish. Fish do not perform chemical separation
of oxygen from water; instead they use the dissolved air that exists in the
water in order to breathe. In the ocean the wind, waves and underwater currents
help spread small amounts of air inside the water. Studies have shown that in a
depth of 200m below the sea there is still about 1.5% of dissolved air. This
might not sound like much but it is enough to allow both small and large fish
to breathe comfortably underwater. Bodner's idea was to create an artificial
system that will mimic the way fish use the air in the water thus allowing both
smaller submarines and divers to get rid of the large, cumbersome compressed
air tanks
The general structure of the system
The system developed by Bodner uses a well known physical law
called the "Henry Law" which describes gas absorption in liquids.
This law states that the amount of gas that can be dissolved in a liquid body
is proportional to the pressure on the liquid body. The law works in both
directionslowering the pressure will release more gas out of the liquid. This
is done by a centrifuge which rotates rapidly thus creating under pressure
inside a small sealed chamber containing sea water. The system will be powered
by rechargeable batteries. Calculations showed that a one kilo Lithium battery
can provide a diver with about one hour of diving time.
Bodner has already built and tested a laboratory model and he is
on the path to building a full-scale prototype. Patents for the invention have
already been granted in Europe and a similar one is currently pending
examination in the U.S. Meetings have already been held with most major diving
manufacturers as well as with the Israeli Navy. Initial financial support for
the project has been given by Israel Ministry of Industry and Commerce and
Bodner is currently looking for private investors to help complete his project.
If everything goes according to plan, in a few years the new
tankless breathing system will be operational and will be attached to a diver
in the form of a vest that will enable him to stay underwater for a period of
many hours.
Transcript of the Interview with Alon Bodner:
Question: We are speaking now with engineer Alon Bodner. First
of all I have to tell you that since we put up your report on IsraCast, we have
been inundated with literally millions of people going into our website to find
out about your invention. Just where did you get the idea sir?
Bodner: My seven years old son, Aviv, asked me some questions
about the possibility of diving without tanks, maybe he was inspired by a Star
Wars' movie, and then the wheels in my head started spinning. I knew that there
is dissolved air in the water and that the fish breath this air so I thought,
with all the technology in the world, why couldn't we also do it?
Question: But just how practical is your idea, have you actually
tried to run through this prototype in a pool or that kind of thing?
Bodner: I call it a lab model it's not yet a prototype, it's in
an aquarium which has a pump, a centrifuge, some hoses and a balloon, we cannot
take it into the water yet, into the sea, but we tried it out with water and we
saw that in principle it works.
Question: In principle it works. We've been getting inquiries
from people all around the world, some are asking what about the quantity, the
large quantities of water that might have to be processed in order to get an
adequate amount of oxygen for a diver?
Bodner: I want to distinguish between open diving systems and
closed diving systems. Usually when you go sports diving it's with open systems
and this means that you inhale air from a tank and you exhale it into the
water, and this requires a very large quantity of air. With closed systems,
such as with breathers for individual divers or submarines or maybe in the
future underwater habitats, the required water flow is much smaller, so this
device is very suitable.
Question: In other words, it could be a portable apparatus?
Bodner: It is supposed to be a portable apparatus, yes.
Question: And when you speak of underwater habitats, just what
do you have in mind?
Bodner: Well right now there exists several underwater habitats
especially for research, off the coast of Florida there is one. It's like a
Spacelab in the past, in which a few scientists live 10-20 meters underwater,
they breath from compressed tanks and perform experiments. In the future, you
can have a whole city or many people under a glass dome and breathing air straight
from this device.
Question: What about the scientific community, have you yourself
been approached by scientists and so forth?
Bodner: Well I have, a few people do not understand the concept,
they assume that I separate oxygen from the water and they say correctly that
it is toxic below a depth of seven meters and then they ask some technical
questions. In this case I want to say again, the device can extract air from
the water. It is dissolved air which contains oxygen and nitrogen and so on. It
does not extract oxygen from hydrogen.
Question: And what are some of the technical problems that you
have to overcome at this stage?
Bodner: The main concerns are the power of the batteries I
suppose and the water flow. The batteries are evolving in a very good rate
and we don't expect any problems right now. As I said the water flow can be a
problem, especially if using open systems, if you want I can elaborate better
calculations.
Question: If you could, please.
Bodner: The calculation is quite different for open or closed
systems; I'll start with the calculations for open systems. A diver can consume
about 25 liters per minute of air at the surface. Assuming that there's about 2
percent of dissolved air in the water, the calculations show the water flow
requirement of 1,250 liters per minute. As you go deeper your lungs require
more air. At 10 meters depth the air and water flow requirement is double than
that on the surface so that means that you will need 2,500 litters per minute
of water, and this is a lot. For closed systems, the
calculation is different. In these systems the air is re-circulated and returned to the diver after the carbon dioxide is removed. For this case we calculate the oxygen consumption rate and not the air consumption rate as before. Say a diver consumes one liter per minute of oxygen, and unlike the above calculation your body requires the same amount of oxygen at all depths. So, assume there is about half a percent of dissolved oxygen in the water, this result in the water flow requirement of only 200 liters per minute at all depths, which is not too bad, and we can make a compact machine for this.
calculation is different. In these systems the air is re-circulated and returned to the diver after the carbon dioxide is removed. For this case we calculate the oxygen consumption rate and not the air consumption rate as before. Say a diver consumes one liter per minute of oxygen, and unlike the above calculation your body requires the same amount of oxygen at all depths. So, assume there is about half a percent of dissolved oxygen in the water, this result in the water flow requirement of only 200 liters per minute at all depths, which is not too bad, and we can make a compact machine for this.
Question: Engineer Bodner, you are a diver yourself?
Bodner: Yes, lately I dive mainly in the Red Sea in Eilat and in
the Mediterranean Sea, in the past I also dived in the Bahamas and off California.
Question: So you can be a guinea pig for your own invention now?
Bodner: I'd love to, but there are also many other volunteers, I
get lots of e-mail from people all over the world who want to volunteer, to be
among the first to use the systems.
Question: OK, let's go to the big question now. How long do you
estimate that it might take before your remarkable invention actually goes on
the market, becomes marketable, in a finished product?
Bodner: I expect the complete work the complete working
prototype in about two years; this is provided if I get more funding, a
commercial product will be ready shortly thereafter.
Question: Well, what can we say, perhaps when the Wright
brothers talked about people flying like birds in the air, you're following in
their footsteps and talking about people that can swim like fish in the sea.
Bodner: Well I hope so but it's too early still to compare me
with the Wright brothers but I appreciate the comparison.
Question: Have you had approaches from manufacturing companies
and so forth?
Bodner: I have but the discussions are still at early stages so
of course I cannot divulge which names I'm speaking to.
Iddo Genuth, Tomer Yaffe - IsraCast, Jerusalem
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