<HTML><HEAD></HEAD><BODY><font face="Courier New" size=2>Marc exact
that..<BR><BR>- Close the door of the engine
compartment helps.<BR><BR>- stay a time on the surface before diving
helps also
-but not so much. <BR></font> On a close
enviroment like
a submarine the machinery is still hand warm on the next day..<BR><BR>-
The
pressure tight cooling system is exact what I did. But for other
reasons.<BR><BR> A normal boats diesel cooling has a internal
freshwater
cecurit with a pump on the engine for the freshwater. <BR> than a
heat
exchanger between the interank freshwater and the external seawater and
a
seawater pump for the external seawater cecurit. <BR><BR> For
saftey
reason I go for a single loop. Means only the freshwater sytem but
running
to the outside pipes and pressure tight. Caleld "keel cooling system"
here. Many fishing vessel here have aht simple system. Only
one pump,
no heat exchanger and no vales to close before diving on the cooling
system. Of
course there are two valves - but just for emergency closing
if the
outside pipe system is damage - very unusual by angle bar pipes made of
one inch
strong steel. <BR><BR> In general the system can be use to
cool the
engine block down. But my freswater pump is direct driven by the diesel
via
a belt and will not operate underwater. And I think it is wrong to
cool
the diesel down that way - maybe you need his force short after
surfacing.
<BR><BR>On a psub size sub it makes sence to run the diesel just as
electric
powergenerator in his own sound box. <BR>Purchase of the shelf ready
with all
auxillariy systems. On a bigger sub like Euronaut it may mmakes more
sences for
a direct diesel driven propeller gear with a auxillery generator to load
the
batteries and drive the baot underwater. <BR><BR>vbr
Carsten<BR><BR>"Marc de Piolenc" <<A
href="mailto:piolenc@archivale.com">piolenc@archivale.com</a>>
schrieb:<BR>> My thinking exactly in planning air intake into the
cabin, drawn by and <BR>> into the engine.<BR>> <BR>> Good
point about residual heat when diving. My only "solution" to this
<BR>> would be to provide a thermosiphon loop that would continue
cooling the <BR>> engine's heat exchanger while diving, but that
would of course mean that <BR>> the whole heat exchanger system would
have to be built to withstand full <BR>> dive depth. Not very
satisfactory. I suppose one could either close off <BR>> the engine
compartment while diving or just spend some time on the <BR>> surface
prior to diving to allow the heat to dissipate.<BR>> <BR>>
Marc<BR>> <BR>> On 10/12/2013 1:56 AM, <A
href="mailto:MerlinSub@t-online.de">MerlinSub@t-online.de</a>
wrote:<BR>> > Breathing air for the diesel engine from inside the
cabin is very common<BR>> > to clean the cabin air. Air goes in
the cabin via the open hatch.<BR>> ><BR>> > It also remove
the little leaks from the exhaust and the oil dust. And<BR>> >
works very well on the surface.<BR>> > In Euronaut the diesel air
inlet is from the battery bilge compartment<BR>> > to vent also
the battery gases during charing them on the surface run.<BR>> --
<BR>> Archivale catalog: <a
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Polymath weblog: <a
href="http://www.archivale.com/weblog">http://www.archivale.com/weblog</a><BR>>
Translations (ProZ profile): <a
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Translations (BeWords profile): <a
href="http://www.bewords.com/Marc-dePiolenc">http://www.bewords.com/Marc-dePiolenc</a><BR>>
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href="http://massflow.archivale.com/">http://massflow.archivale.com/</a><BR>>
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<BR><font face="Courier New" size=2> </font><font face="Courier
New" size=2><br><br>-- <br><BR>Carsten Standfuß<BR>Dipl.Ing.Schiffbau @
Meerestechnik<BR>Heinrich Reck Str.12A<BR>18211 Admannshagen<BR><BR>0172
8464
420<BR>WWW.Euronaut.org<BR>Carsten@euronaut.org</font></BODY></HTML>