[PSUBS-MAILIST] Peltier Airconditioner

Mon Aug 14 16:54:04 EDT 2017

Or have the wall mounted peltiers cool water that circulates through a
cooling suit like astronauts and race car drivers wear. You deliver all the
cooling directly to the occupant and optimally reject heat directly to the
outside water. All of this is another entanglement for the occupants
though.

On Aug 14, 2017 4:33 PM, "via Personal_Submersibles" <
personal_submersibles at psubs.org> wrote:

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Today's Topics:

   1. Re: Peltier Airconditioner (T Novak via Personal_Submersibles)
   2. Re: Peltier Airconditioner (Alan via Personal_Submersibles)
   3. Re: UC3 Nautilus (Michael Holt via Personal_Submersibles)
   4. Re: UC3 Nautilus (james cottrell via Personal_Submersibles)

----------------------------------------------------------------------

Message: 1
Date: Mon, 14 Aug 2017 10:40:22 -0700
From: T Novak via Personal_Submersibles
        <personal_submersibles at psubs.org>
To: "'Personal Submersibles General Discussion'"
        <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] Peltier Airconditioner
Message-ID: <001b01d31524$68915fc0$39b41f40$@telus.net>
Content-Type: text/plain; charset="utf-8"

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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Message: 2
Date: Tue, 15 Aug 2017 07:36:20 +1200
From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion
        <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] Peltier Airconditioner
Message-ID: <7C1F9495-599D-460C-9235-5A7D09DC6BD3 at yahoo.com>
Content-Type: text/plain; charset="us-ascii"

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
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
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Message: 3
Date: Mon, 14 Aug 2017 12:13:14 -0400
From: Michael Holt via Personal_Submersibles
        <personal_submersibles at psubs.org>
To: personal_submersibles at psubs.org
Subject: Re: [PSUBS-MAILIST] UC3 Nautilus
Message-ID: <c75c6c0c-2b37-f92e-a2ad-803ebdc08c0e at ohiohills.com>
Content-Type: text/plain; charset=utf-8; format=flowed

On 8/14/2017 1:23 AM, Douglas Suhr via Personal_Submersibles wrote:
> No one would be so stupid as to sink their sub intentionally, right? ~
The blogger has a favorite hate: art replacing engineering.  There are
easy ways to anger him, and this was one of them.  His background is
aerospace; that appears to result in small-scale and personal projects
irritating him at a subconscious level.

Other than that, he's a great source of historical aerospace
information. I've always had a particular interest in the Mercury capsule.

Mike

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Message: 4
Date: Mon, 14 Aug 2017 20:29:10 +0000 (UTC)
From: james cottrell via Personal_Submersibles
        <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion
        <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] UC3 Nautilus
Message-ID: <312451248.1589324.1502742550490 at mail.yahoo.com>
Content-Type: text/plain; charset="utf-8"

Mike,
I had the pleasure of working on and around most of the space capsules in
the Smithsonian collection including Freedom 7 and Friendship 7. Got to
meet John Glenn when I was designing a form fitted acrylic cover for his
Mercury capsule. Those were certainly exciting times in american history.
Greg C

      From: Michael Holt via Personal_Submersibles <
personal_submersibles at psubs.org>
 To: personal_submersibles at psubs.org
 Sent: Monday, August 14, 2017 3:41 PM
 Subject: Re: [PSUBS-MAILIST] UC3 Nautilus

On 8/14/2017 1:23 AM, Douglas Suhr via Personal_Submersibles wrote:
> No one would be so stupid as to sink their sub intentionally, right? ~
The blogger has a favorite hate: art replacing engineering.? There are
easy ways to anger him, and this was one of them.? His background is
aerospace; that appears to result in small-scale and personal projects
irritating him at a subconscious level.

Other than that, he's a great source of historical aerospace
information. I've always had a particular interest in the Mercury capsule.

Mike

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