<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div><span></span></div><div><meta http-equiv="content-type" content="text/html; charset=utf-8"><div></div><div>Hi Brian,</div><div>I have just named a file "air conditioning" as I couldn't find any of my </div><div>past research.</div><div>I don't know how many peltiers. If you based your air conditioning system</div><div>on a car which uses 4 hp or 2,980 Watts & factored in that peltiers are 1/4</div><div>as efficient as conventional air conditioning then you would need 11,920 W</div><div>to get the equivalent cooling! And then it's an unknown as the peltiers are</div><div>more efficient when there is a larger temperature differential between sides.</div><div>So when you really need AC in Florida, because the water is warm, the peltier</div><div>will be less efficient ( as I presume the AC system will be ).</div><div>Directing the ducted cold air on to you rather than trying to cool the whole </div><div>sub is the best way to go.</div><div>I have heard that some commercially available subs use a lot less power in their </div><div>AC systems than cars. Cars don't sit in water, so subs have that advantage.</div><div>As I have said, peltiers are an efficient heater, so there is no waste putting them</div><div>in even if you have a not so good air conditioner.</div><div>With the boat air conditioners you have to get rid of the heat they produce</div><div>to the water which could be a problem with pressures that subs go down to.</div><div>If you force an air stream over the peltiers moisture will condense on them so</div><div>maybe mount them on a slope with a drain at the bottom.</div><div>I was thinking of mounting them with a heat transfer glue either direct to the </div><div>hull or on an Aluminium heat sink that is bolted in contact with the hull.</div><div>If I went with the Aluminium heat sink I would have to ensure the contour </div><div>of the heat sink matched the hull perfectly & add some heat transfer paste.</div><div>I like the heated vest idea. </div><div>Phil Nuyten said Nuytco used an external air conditioner & kept the sub cool</div><div>that way before diving. They also had vests with pockets that they stored</div><div>re freezeable chilly pads in.</div><div>Alan</div><div><br></div><div><br></div><div><br></div><div><br>On 3/04/2019, at 12:15 AM, Brian Hughes via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<div dir="auto" style="direction: ltr; margin: 0; padding: 0; font-family: sans-serif; font-size: 11pt; color: black; ">
Alan,<br>
<br>
</div>
<div dir="auto" style="direction: ltr; margin: 0; padding: 0; font-family: sans-serif; font-size: 11pt; color: black; ">
How many peltier chips do you think you'll use? Or need? I was kinda planning the same idea, but was trying Kydex. I made a cover with a thin sheet of clear plastic, but I wondered about durability. Hadn't thought fiberglass. Doh. The real reason is I picked
up for free a vacuum thermomolding machine and needed an excuse to play. <br>
<br>
</div>
<div dir="auto" style="direction: ltr; margin: 0; padding: 0; font-family: sans-serif; font-size: 11pt; color: black; ">
As per attachment I was thinking magnets, the chrome covered ones you can get a home depot. Attach where needed. Spread heat transfer paste on the surface, etc. How will you attach yours? Building in piping for condensation runoff?
<br>
<br>
</div>
<div dir="auto" style="direction: ltr; margin: 0; padding: 0; font-family: sans-serif; font-size: 11pt; color: black; ">
For heat I'm going with a cigarette lighter socket into which I can plug my heated vest I use on cold days on the Harley. Keep the core warm, etc.
<br>
<br>
</div>
<div dir="auto" style="direction: ltr; margin: 0; padding: 0; font-family: sans-serif; font-size: 11pt; color: black; ">
<div dir="auto" style="direction: ltr; margin: 0; padding: 0; font-family: sans-serif; font-size: 11pt; color: black; ">
Get <a href="https://aka.ms/ghei36">Outlook for Android</a></div>
<br>
</div>
</div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>Personal_Submersibles mailing list</span><br><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></div></blockquote></div></body></html>