<html><head></head><body><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 <josephperkel@yahoo.com> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:14pt"><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-top: 2.5em; margin-bottom: 1em; border-bottom: 1px solid #000"></p><pre class="k9mail"><hr /><br />Personal_Submersibles mailing list<br />Personal_Submersibles@psubs.org<br /><a 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>
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