Re: [PSUBS-MAILIST] Sodium Polyacrylate

Unfortunately the coiling coil heat exchange dehumidifier doesn?t work in warm waters as you need a fair temperature differential to get effective condensation. Again, keep it simple; the more mechanics you put into the sub, the more likely it isn?t going to work. Also think about these motors in the high humidity atmosphere we are discussing?they will have a short life if they don?t arc & spark at the wrong time. Two things submariners fear the most: fire and flooding.

Respectfully,

Jay K. Jeffries

Andros Island, Bahamas

Natura nihil fit in frustra
- Nature does nothing in vain

From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of George Slaterpryce
Sent: Wednesday, September 06, 2006 4:45 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Sodium Polyacrylate

Yeah, A brass plate fitted to the hull would work great... like a giant heat sink. Problem is the unit would have to be custom fit for each hull. Which might not be a huge issue now that I think about it. PSubbers are mostly all mechanicly inclined or know someone who is. I'm pretty sure they could figure out how to fit a heat sink to the hull.

It wouldn't be anything more complex than a snaking of brass/copper tubing over a copper plate that would have to be bolted and formed to the inner hull salt water would probably go best with this, should transfer heat a bit better.. plus not be as volatile as alchohol. Although alchohol would still be better from a pure efficiency viewpoint. Then again regular coolant would probably be more efficient... but that's not within the constraints I'm envisioning this.

George H. Slaterpryce III
www.captovis.com

----- Original Message -----

From: Paul Kreemer

To: personal_submersibles@psubs.org

Sent: Wednesday, September 06, 2006 4:33 PM

Subject: Re: [PSUBS-MAILIST] Sodium Polyacrylate

I wonder if you couldn't circulate seawater thru instead. Or just a passive thermal connection to the pressure hull. It'd be nice to take advantage of the dropping ambient water temperature, since it's what's causing much of the condensation.

Paul

On 9/6/06, George Slaterpryce <gslaterp@hotmail.com> wrote:

Addendum to this message.

Two considerations 1. If you fit the powder pack of sodium polyacrylate loose enough you won't have to use a high power induction fan (like the one used on an air conditioner) you could use a relatively low power consumption 12vdc motor based fan.

second, I don't know yet if alchohol is the best coolant of choice as it's flamable.

George H. Slaterpryce III
www.captovis.com

----- Original Message -----

From: George Slaterpryce

To: PSUBS Mailing List

Sent: Wednesday, September 06, 2006 3:23 PM

Subject: [PSUBS-MAILIST] Sodium Polyacrylate

Ok, I can't find a pre-fab Hummidity filter made with this stuff anywhere online... I know that they are made... but my google-fu is not strong on this search.

SO...

I thought about how you might make one.

First and foremost, used product will have to be switched out from time to time, so the main filter component will have to be easy to get to and switch out.

Second to promote condensation and from there condensation inside the filter unit itself it'll have to be slightly cooler than the enviroment outside the filter... Problem... small refrigiration units are expensive (energy use wise)

So, what I think one should do is to use a pipe with a fan on the intake side and a normal air filter on the outflow side. that inbetween the intake and outflow has a copper coil with a simple fountain (12vdc) pump that pushes rubbing alchohol through the pipe at speed. Probably accellerated via a kort like nozzle off the pump. It wouldn't cool well enough for a air conditioner, but it should promote a cool atmosphere inside the filter which would promote water to condense within the filter. In the center of the coil which is inside the pipe would be a tissue bag full of sodium polyacrylate. That once used can simply be pulled out and replaced.

I'm thinking of taking a break from BugEye II to prototype this. Anyone interesting in providing a testbed if I do?

George H. Slaterpryce III
www.captovis.com