[PSUBS-MAILIST] Thermoelectric air conditioning

keith tollett k6fee at yahoo.com
Thu Mar 6 13:50:47 EST 2014


Alan,

Forgot to mention that those thermoelectric modules can be pulse width modulated to make their current drain much more manageable and still accomplish climate and humidity control. There would be a fan needed on the air side, and the other could be directly attached to the steel hull with thermal grease. That would make a very efficent heat/cold sink, and eliminate another fan. There are comercial pic controlers on Evil-Bay for under $50, or if your handy with a soldering iron, you can make your own.

Keith





On Wednesday, March 5, 2014 8:05 PM, Joe Perkel <josephperkel at yahoo.com> wrote:
 
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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>
>-- 
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>Polymath weblog: http://www.archivale.com/weblog
>Translations (ProZ profile): http://www.proz.com/profile/639380
>Translations (BeWords profile): http://www.bewords.com/Marc-dePiolenc
>Ducted fans: http://massflow.archivale.com/
>
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