[PSUBS-MAILIST] Thermoelectric air conditioning

[Joe Perkel]

Yes, very interesting. I also have a more than passing interest in climate control.

Joe


On Mar 5, 2014, at 10:50 PM, Alan James <alanlindsayjames at yahoo.com> wrote:

> Thanks Keith,
> that's an encouragement to know that they operate them on a large scale
> like that.
> Alan
> 
> From: keith tollett <k6fee at yahoo.com>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
> Sent: 
> Subject: Re: [PSUBS-MAILIST] Thermoelectric air conditioning
> 
> Alan,
> 
> U.S. Military subs use this for climate control. Don't want any noxious refrigerants loose in a closed environment. No moving parts, though they do eat a lot of power (not an issue on nuke boats).
> 
> Keith
> 
> 
> 
> On Wednesday, March 5, 2014 6:22 PM, Marc de Piolenc <piolenc at archivale.com> wrote:
> There's an active discussion of Peltier devices ongoing on the other 
> personal submersibles mailing list 
> (international_psubs_minisubs at yahoogroups.com). You might want to join it.
> 
> Quick points: you still need some way to dump heat outside the boat, 
> otherwise you're just moving heat from one point you want to cool, to 
> another that can't afford to get any hotter. And of course the Peltier 
> device produces heat of its own.
> Which leads to the second key point, namely that there is an optimum 
> current for heat pumping, and for some reason the manufacturers 
> routinely rate their modules for a voltage that gives a higher current, 
> and thus poor heat pumping efficiency. You have to learn certain key 
> characteristics of your unit and come up with your own rating. The unit 
> I fooled with back in the States was rated at 12 volts, but worked much 
> better with an 8-ohm resistor in series.
> 
> Marc de Piolenc
> 
> On 3/6/2014 9:08 AM, Alan James wrote:
> > Hi Psubbers,
> > Has anyone looked at thermoelectric coolers (peltier devices) for air
> > conditioning / dehumidifying & heating.
> > I'm hopeful someone might be able to save me a bit of research.
> > http://en.wikipedia.org/wiki/Thermoelectric_cooling
> > For those who aren't familiar, they are normally used to cool small
> > units like computers, electrical cabinets & chili bins.
> > They are about 1&1/2" square & 1/8"  thick with two wires coming off them.
> > The unit I have is 60W & operates off 12-15V. When powered up, one side
> > gets hot & the other cold.
> > The cooling effectiveness is regulated by how well you can dissipate the
> > heat from the hot side.
> > In the submersible application the hull can act as the heat sink. By
> > switching polarity you have a heater.
> > The down side is that you use about 3 times more power for cooling than
> > traditional refrigeration units,
> > however an air conditioning unit is bulky, & it would be a trade off
> > between the additional battery size & expense
> > to run the peltier cooler as apposed to the bulk & expense of an air
> > conditioning unit & it's associated through
> > hull heat exchange unit .
> > The heating faze is more economical.
> > G.L. require air conditioning & humidity control in submersibles.
> > Thanks
> > Alan
> >
> >
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