[PSUBS-MAILIST] Peltier Airconditioner

Mon Aug 14 17:26:14 EDT 2017

7000 btu air conditioner is what Uboat Worx uses and they have stuck with that size for 2-3 people.  So find what models are around and what current they use and there is your answer.

Regards,  Hugh

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Alan via Personal_Submersibles
Sent: Tuesday, 15 August 2017 7:36 AM
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] Peltier Airconditioner

Tim,

I was nearly going to mention this; but I was thinking just have

the air flow directed on the occupants. 

I have heard mention of clothing with Peltiers in them. 

Alan

Sent from my iPad

On 15/08/2017, at 5:40 AM, T Novak via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

During the winter some people prefer infra-red heaters in their homes to directly warm the occupants. This is considered to be more efficient than heating up air and then forcing it into the living space.  Similarly, perhaps several peltiers could be placed on the sub pilots person to directly cool him in the otherwise warm air environment?  A set of cooling headband, wristbands, and leg/foot wraps to cool the blood where it is close to the surface of the body?  You only need cooling while the sub is on or close to the surface.

Tim

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Alan via Personal_Submersibles; 
Sent: Monday, August 14, 2017 12:08 AM
To: personal_submersibles at psubs.org
Subject: [PSUBS-MAILIST] Peltier Airconditioner

Have looked in to this a bit more.

An average compression type car air conditioner takes about 3000W 

of power to  run. Cooling with peltiers requires 4x this power to get the

equivalent effect. So 12000W required to keep up with a car air conditioner!

Peltiers have a typical maximum difference in temperature from one side

to the other of 70C, but to run at maximum efficiency it is recommended 

to keep the temperature difference at less than 30C. So this would mean

a peltier rated 72W should be run at around 30W. 

The efficiency also depends on how well you can remove the heat from

the hot side, as if it gets too hot the heat build up can migrate across to the 

cold side.

A 1&1/2 x 1&1/2" peltier may be around 72W (12V & 6 A) & cost  US $3:61

Deal Extreme with free shipping....

http://m.dx.com/p/tec1-12706-semiconductor-thermoelectric-cooler-peltier-white-157283?stiff=99

So to get the same cooling as your car air conditioner you need 166 of these 

& that's running them at full power & not the more economical half power.

    I have read that a peltier air conditioner can drop a cars temperature to 20C

below ambient, but I don't have any specs on the unit they mention.

   I am going to persevere with them as I am building a small one person sub

& I like that I can make a dehumidifyer, airconditioner & heater all in one & take

up little room.  As discussed, their heating efficiencies are great, so if you look

at them as a descent heater with the spin off of some cooling benefit then they

don't look so bad!  Battery technology is leaping forward, so I am anticipating that

their power drain won't be such a big deal by the time I get around to buying

batteries.

Cheers Alan

Sent from my iPad

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