[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [PSUBS-MAILIST] Hydrogen Build-up



Hydrogen in it's gas form is extremely light and you require an awful lot to even have the smallest explosive power (say to move a piston in an engine). It's the reason we don't have Hydrogen powered cars yet, the only way to get any usefullness out of Hydrogen is to concentrate it as a liquid...problem....Hydrogen becomes a liquid at like -200 Celsius. So not only do you have to use up resources to extract the Hydrogen from the water but you must expend even more cooling it and keeping it that way. So in the end of it all you end up spending more energy than you get from it. Plus at -200 Celsius you can't touch it, it's so cold it burns.

George Slaterpryce wrote:

But oh so very usefull. I wonder if you could build a hydrogen powered sub... I mean it's fairly easy to extract from water... although not very energy efficient, but you could set up a solar powered hydrogen extractor in your back yard and build up your resevoir over time... if you set it up right you could /probably/ have a couple AL80 tanks full of hydrogen every week or so. Although that might be a tad bit dangerous... maybe, I don't know I'm gonna have to think about that one. (you'd also have AL80s full of oxygen if you wanted to trap that gas, which if you were insane and wanted to mix your own nitrox on a home built rig, you could use the extra oxygen for.) It would have to be some sort of steamer system.... either that or a stirling engine powered sub... You'd have crap all for acceleration rate, but you'd have a good efficiency rate. And that is my brain dropping for the day. George Slaterpryce

    ----- Original Message -----
    *From:* vbra676539@aol.com <mailto:vbra676539@aol.com>
    *To:* personal_submersibles@psubs.org
    <mailto:personal_submersibles@psubs.org>
    *Sent:* Wednesday, April 12, 2006 4:36 PM
    *Subject:* Re: [PSUBS-MAILIST] Hydrogen Build-up

    odorless, colorless, tasteless plus deadly and silent--given the
    wrong circumstances.
Vance -----Original Message-----
    From: Ray Keefer <psubs2001@yahoo.com <mailto:psubs2001@yahoo.com>>
    To: personal_submersibles@psubs.org
    <mailto:personal_submersibles@psubs.org>
    Sent: Wed, 12 Apr 2006 12:54:28 -0700 (PDT)
    Subject: Re: [PSUBS-MAILIST] Hydrogen Build-up

Hi,

"whiff of hydrogen"?

I had always assumed you couldn't smell hydrogen. Does
anyone know one way or the other?

Thanks,
Ray

--- "Dan H." <jmachine@adelphia.net <mailto:jmachine%40adelphia.net>> wrote:

Steve,

I'm not a battery expert and wasn't going to respond
to this thread but since your life may hang in the
balance, I'll respond. :-)

Most of the hydrogen produced from batteries is
produced on charging.  Some is produced on
discharging, but not much.  No matter whether
charging or discharging, there is always hydrogen
present at the top of each cell within the battery
and it oozes out.
It's best to keep the batteries away from anything
that could possible ignite it, or in a safe place
incase they do go off.  That's one advantage of
having them in a separate pod.  The other advantage
is the room it frees up in the hull.  The
disadvantages are, some method of venting while
charging has to be provided for and a battery in a
pod isn't as easily gotten to for service.  Also
there are weight factors and the expense of a
separate pressure pod etc. etc.

There are Hydrocaps available which absorb the
hydrogen, and convert it to water I believe, but
they have their flaws too.  I don't know of a
scrubber for a battery pod, but it sounds plausible.
My batteries are in pods, and don't have Hydrocaps
but I have pod vent caps I open while charging.  The
vents vent into the hull so I can charge while in
the water but I must leave the sub hatch opened. While in use, the vents are capped off with heavy
pipe caps.  The end of each battery pod on my sub
are made so an explosion will blow the pod end off,
and hopefully not impact the hull.

One thing I've noticed is, I don't get a whiff of
hydrogen when I open my pod vents after use and
before charging.  So I assume what I was told about
most of the hydrogen being produced during charging,
and not while in use, is true.
Damn I'm long winded, but hey, if it could save a
life, I'll talk! ;-)
Take care, Dan H.


----- Original Message ----- From: Stephen Pearce To: personal_submersibles@psubs.org <mailto:personal_submersibles%40psubs.org> Sent: Wednesday, April 12, 2006 4:51 AM
  Subject: [PSUBS-MAILIST] Hydrogen Build-up


  G-day all

  From the material I have been reading and what I
remember Hydrogen gas is formed in lead acid
batteries when charging and dischrgeing. My
understanding is that if you ventilate the battery
compartment  with the atmosphere when running on the
surface and the air in the pressure hull when
submerged this can stop a BIG BANG!
  Can anyone suggest the amount of Hydrogen as a %
of the Subs atmosphere is required for an explosion
to occour? Is there such a thing as a Hydrogen
Scrubber? Is hydrogen produced more readerly when
charging or discharging the batteries.

  By contributing to this string the life you save
could be mine<J

  Regards

  Steve P



__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com


************************************************************************
************************************************************************
************************************************************************
The personal submersibles mailing list complies with the US Federal
CAN-SPAM Act of 2003.  Your email address appears in our database
because either you, or someone you know, requested you receive messages
from our organization.

If you want to be removed from this mailing list simply click on the
link below or send a blank email message to:
   removeme-personal_submersibles@psubs.org <mailto:removeme-personal_submersibles%40psubs.org>

Removal of your email address from this mailing list occurs by an
automated process and should be complete within five minutes of
our server receiving your request.

PSUBS.ORG
PO Box 311
Weare, NH  03281
603-529-1100
************************************************************************
************************************************************************
************************************************************************





************************************************************************
************************************************************************
************************************************************************
The personal submersibles mailing list complies with the US Federal
CAN-SPAM Act of 2003.  Your email address appears in our database
because either you, or someone you know, requested you receive messages
from our organization.

If you want to be removed from this mailing list simply click on the
link below or send a blank email message to:
	removeme-personal_submersibles@psubs.org

Removal of your email address from this mailing list occurs by an
automated process and should be complete within five minutes of
our server receiving your request.

PSUBS.ORG
PO Box 311
Weare, NH  03281
603-529-1100
************************************************************************
************************************************************************
************************************************************************