[PSUBS-MAILIST] pulled thread line - submarine AC and heat

[Alan via Personal_Submersibles]

Hello Marc,
haven't heard from you for a while.
What calculation was off?
Peltiers are 1/4 as efficient as conventional AC.
Average car AC system uses 4hp which is 2,980W.
4 X 2980 = 11,920.
Wish it was off as I have bought 20 so far & I am going to need a lot of
batteries to keep up with a cars AC system.
I am starting to talk myself out of relying on them solely & in to a good snorkel 
system that I could suck air through while transiting on the surface.
Alan

> On 4/04/2019, at 4:38 PM, Marc de Piolenc via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Pretty sure your calculations are off.
> 
> Did some work with Peltier effect coolers a few years back.
> 
> Search for information on this technology as applied in the military. There are many applications for which vapor-compression refrigeration is not possible or too dangerous.
> 
> Marc
> 
>> On 03/04/2019 9:18 AM, Alan via Personal_Submersibles wrote:
>> 
>> I don't know how many peltiers. If you based your air conditioning system
>> on a car which uses 4 hp or 2,980 Watts & factored in that peltiers are 1/4
>> as efficient as conventional air conditioning then you would need 11,920 W
>> to get the equivalent cooling! And then it's an unknown as the peltiers are
>> more efficient when there is a larger temperature differential between sides.
>>> On 3/04/2019, at 12:15 AM, Brian Hughes via Personal_Submersibles <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org>> wrote:
>>> Alan,
>>> 
>>> 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.
>>> 
>>> 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?
>>> 
>>> 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.
>>> 
>>> Get Outlook for Android <https://aka.ms/ghei36>
>>> 
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