[PSUBS-MAILIST] Dive report - Pickles Reef

[Marc de Piolenc]

I can tolerate the air temperature outside - I've lived here fifteen years.

A confined space, on the other hand, tends to reach higher temperatures. 
Constant air exchange with the outside essentially maintains outside 
conditions - which I can tolerate - inside. Good enough for me. For a 
visitor newly arrived from Alaska it might not do.

If the air conditioning on my van is on the fritz, I just open a couple 
of windows. God help me if BOTH the window winder mechanisms AND the 
aircon are broken!

Marc

On 10/11/2013 11:20 AM, Jon Wallace wrote:
>
> Hi Marc,
>
> I don't understand how renewal of the ambient tropic air will help with environmental comfort to the point of not requiring some kind of air conditioning.
>
> Jon
>
>
> --------------------------------------------
> On Thu, 10/10/13, Marc de Piolenc <piolenc at archivale.com> wrote:
>
>   Subject: Re: [PSUBS-MAILIST] Dive report - Pickles Reef
>   To: personal_submersibles at psubs.org
>   Date: Thursday, October 10, 2013, 10:15 PM
>
>   I've been following this discussion
>   with great interest. I don't have a sub yet, but I do live
>   in the Tropics, and as there's no cold current handy to
>   where I live any subbing I do will be in water pretty near
>   air temperature. As you might expect, I've given this
>   problem a lot of thought.
>
>   My tentative conclusion is that, if I build a sub, I will
>   have to make it more autonomous than is the rule on this
>   list. Specifically, it will need a combustion engine to
>   ferry itself on the surface to dive sites, and to maintain
>   comfort and keep the battery topped off for diving while
>   doing so. I started with the assumption that I would need an
>   air conditioning unit running off a small industrial diesel,
>   but then I realized that, if I use a snorkel exhausting into
>   the cabin, and have the diesel draw air from the cabin, I
>   get continuous renewal of the air in the cabin without the
>   cost, power burden and safety problems of running a Rankine
>   cycle refrigeration system. That's the solution that I've
>   retained for the moment. Of course I also need a secure
>   means of preventing exhaust gas from being aspirated into
>   the snorkel (I can't quite understand how naval submarines
>   manage to combine both functions in one mast), but that
>   might be as simple as having the diesel exhaust flush with
>   the hull, with some arrangement to prevent water from coming
>   in. Since the diesel would only be used on the surface, and
>   the snort would only be there to allow a low-freeboard hatch
>   to be kept closed, the power penalty would be minimal.
>
>   Fuel storage, fuel feed and the like still have to be worked
>   out. Naval submarines have very complex arrangements for
>   this, and that complexity must be tolerated for a good
>   reason. Even so, I need a simpler way to do it that still
>   protects the fuel from contamination and me from
>   asphyxiation.
>
>   Marc de Piolenc
>
>
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