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<DIV>Joe,</DIV>
<DIV>Since the water doesn't have to be re-cooled as it does in a
closed-loop system, I think the ambient water should be quite
adequate. The heat transfer rate of water is much higher than air and you
have an essentially limitless supply.</DIV>
<DIV>Jim</DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 4/13/2014 8:33:43 P.M. Central Daylight Time,
josephperkel@yahoo.com writes:</DIV>
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<DIV>Sean,</DIV>
<DIV><BR></DIV>
<DIV> Northern climates have nice cool seas, but I'm dealing with
tropical temps here averaging in the 80's in summer. With hot seas, which
scheme would be best? I simply am not certain, my gut says relying on the
ambient water may not do the job. I could be wrong.</DIV>
<DIV><BR></DIV>
<DIV>Joe</DIV>
<DIV><BR>Sent from my iPhone</DIV>
<DIV><BR>On Apr 13, 2014, at 9:16 PM, "Sean T. Stevenson" <<A
title=mailto:cast55@telus.net
href="mailto:cast55@telus.net">cast55@telus.net</A>> wrote:<BR><BR></DIV>
<BLOCKQUOTE type="cite">
<DIV>
<P dir=ltr>Airflow in constrained spaces is often difficult to model.
Alternatives include water cooled motors, or simply effectively heat sinking
the motor housings to the hull and using passive water cooling to the
ambient seawater. Ultimately, that's where the heat is going anyway. Unless
you can use it for some purpose (cabin heat, humidity control etc.) you
might as well sink it as directly as possible.</P>
<P dir=ltr>Sean<BR></P><BR><BR>
<DIV class=gmail_quote>On April 13, 2014 6:45:39 PM MDT, Joe Perkel <<A
title=mailto:josephperkel@yahoo.com
href="mailto:josephperkel@yahoo.com">josephperkel@yahoo.com</A>> wrote:
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<DIV><FONT size=3 face="Times New Roman"></FONT></DIV>
<DIV style="MARGIN: 0in 0in 10pt"><FONT size=3 face=Calibri>I am
considering a scheme for dealing with electric motor cooling and would
like input on the viability of the idea and any pros or cons that I may be
missing.</FONT>
<P></P></DIV>
<DIV><FONT size=3 face="Times New Roman"></FONT></DIV>
<DIV style="MARGIN: 0in 0in 10pt"><FONT size=3 face=Calibri>In looking at
my SeeHund replica, note that the torpedo/pod(s) length exceed needed
battery capacity. <SPAN style="mso-spacerun: yes"> </SPAN>So the idea
being that the aft ends of both will house electric motors that are
isolated from the battery compartments.</FONT>
<P></P></DIV>
<DIV><FONT size=3 face="Times New Roman"></FONT></DIV>
<DIV style="MARGIN: 0in 0in 10pt"><FONT size=3 face=Calibri>I’m thinking
to ventilate these aft motor units into the aft machinery space within the
main hull. Incidentally, the hull diameter will be 42” and the torpedoes
#14 pipe. This will leave a significant airspace around these motor units
allowing me to use fan cooled motor cases.<SPAN
style="mso-spacerun: yes"> </SPAN>Each motor pod could be connected
with vent pipes for intake and output airflow, then the machinery space
itself force vented to the outside with <SPAN
style="mso-spacerun: yes"> </SPAN>main induction and exhaust vents.
<SPAN style="mso-spacerun: yes"> </SPAN>All this for continuous
surface running of course. Submerged, the motor units would be
intermittent duty.</FONT>
<P></P></DIV>
<DIV><FONT size=3 face="Times New Roman"></FONT></DIV>
<DIV style="MARGIN: 0in 0in 10pt"><FONT size=3 face=Calibri>The centerline
unit would be fully enclosed and not vented, therefore not as attractive
for continuous duty due to thermal constraints.</FONT>
<P></P></DIV>
<DIV><FONT size=3 face="Times New Roman"></FONT></DIV>
<DIV style="MARGIN: 0in 0in 10pt">
<P><FONT size=3 face=Calibri></FONT> </P></DIV>
<DIV><FONT size=3 face="Times New Roman"></FONT></DIV>
<DIV style="MARGIN: 0in 0in 10pt"><FONT size=3 face=Calibri>Joe</FONT>
<P></P></DIV>
<DIV><FONT size=3 face="Times New Roman"></FONT><BR></DIV></DIV>
<P
style="MARGIN-BOTTOM: 1em; BORDER-BOTTOM: #000 1px solid; MARGIN-TOP: 2.5em"></P><PRE class=k9mail><HR><BR>Personal_Submersibles mailing list<BR><A title=mailto:Personal_Submersibles@psubs.org href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</A><BR><A title=http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR></PRE></BLOCKQUOTE></DIV><BR>--
<BR>Sent from Kaiten Mail. Please excuse my brevity.</DIV></BLOCKQUOTE>
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