[PSUBS-MAILIST] Thermoelectric air conditioning

[keith tollett]

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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>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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