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Greetings Carsten, The basic keelcooling configuration you speak of, is one configuration I'm thinking of installing on my boat, but with some welded on fins to the cooling tubes as a heat sink to increase efficiency and extra collision protection weldments. I had always been led to believe that it was not as good to just run freshwater as your engine coolant, regardless of the freezing issues we some times deal with in cars. One possible reason to have a fluid heat exchanger like I was talking about in my last post, is that if the exterior pipe is broken in a collision or in some other way starts to leak and take in the external high pressure water at depth, it would be isolated in that line. Of course if you go with a simpler system like your talking about, you can make sure all the keel cooling tubing and connections, that goes to the engine, gear oil cooler, shower, galley and what not, as well as the engine it self, can easily take your subs general operating dive pressure if the external tubing is broken at depth. Needless to say you would also have emergency shut off valves in a number of locations for different systems. Regards,
Brent Hartwig > Subject: RE: [PSUBS-MAILIST] sub plans > From: MerlinSub@t-online.de > To: personal_submersibles@psubs.org > Date: Tue, 26 Feb 2008 17:18:00 +0000 > > Long pressure tight freswater pipe goes out the boat all along the boats keel > and back and later back inside the boat. > No special exchanger. No seawater inside the boat. Called "keelcooling. > Simple single loop. Two security valves inside. In bypass the heat exhanger > for hotwater for shower and kitchen. Another bypass for the gear-oil cooler. > > Air cooled motor can maybe create a heat problem > inside the sub. But depents of size of motor and time of air exchange. > > Many boats from the World WarI and before period have problems with to much heat inside. > > With an aircoled motor, aircooled gear and 1-2 aircooled compressors and all running > you need a big sailhatch.. > > regards Carsten > > > "Brent Hartwig" <brenthartwig@hotmail.com> schrieb: > > > > Isn't there a water heat exchanger, that you can pump sea water through and then through another set of pipes you circulate the motor cooling fluid. Thus keeping salt water out of the engine block? Or is a keel cooling unit a better and simpler option? > > Regards,Brent Hartwig> From: pirate@arach.net.au> To: personal_submersibles@psubs.org> Subject: Re: [PSUBS-MAILIST] sub plans> Date: Tue, 26 Feb 2008 12:39:06 +0900> > Gday Carsten.> The thoughts I came up with regarding the use of an air cooled engine > are,keeping to a minimum the piping through the pressure hull and therefore > eliminating a number of shut off valves, and with internal air ducting to > the conning tower this provides a very effective means of changing the total > volume of air in the sub,> An alternative to this would be to locate the engine in an external pressure > pod that could be kept automatically at the pressure the sub is operating > at.> This would eliminate heat within the interior of the sub and create a lot > more living space.It goes without saying that an aircooled engine is much > lighter than water cooled, does not have the problem of heat exchangers for > fresh/saltwater cooling and reduces corrosion of the block.> As I said before at this stage these are just thoughts and the more feedback > I get the more I learn,and if you have any ideas I would be grateful.> Thanks again> Clive> |