<div dir="auto">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. </div><div class="gmail_extra"><br><div class="gmail_quote">On Aug 14, 2017 4:33 PM, "via Personal_Submersibles" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br type="attribution"><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Send Personal_Submersibles mailing list submissions to<br>
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Today's Topics:<br>
<br>
1. Re: Peltier Airconditioner (T Novak via Personal_Submersibles)<br>
2. Re: Peltier Airconditioner (Alan via Personal_Submersibles)<br>
3. Re: UC3 Nautilus (Michael Holt via Personal_Submersibles)<br>
4. Re: UC3 Nautilus (james cottrell via Personal_Submersibles)<br>
<br>
<br>
------------------------------<wbr>------------------------------<wbr>----------<br>
<br>
Message: 1<br>
Date: Mon, 14 Aug 2017 10:40:22 -0700<br>
From: T Novak via Personal_Submersibles<br>
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>><br>
To: "'Personal Submersibles General Discussion'"<br>
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>><br>
Subject: Re: [PSUBS-MAILIST] Peltier Airconditioner<br>
Message-ID: <001b01d31524$68915fc0$<wbr>39b41f40$@<a href="http://telus.net" rel="noreferrer" target="_blank">telus.net</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
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.<br>
<br>
Tim<br>
<br>
<br>
<br>
From: Personal_Submersibles [mailto:<a href="mailto:personal_submersibles-bounces@psubs.org">personal_submersibles-<wbr>bounces@psubs.org</a>] On Behalf Of Alan via Personal_Submersibles<br>
Sent: Monday, August 14, 2017 12:08 AM<br>
To: <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a><br>
Subject: [PSUBS-MAILIST] Peltier Airconditioner<br>
<br>
<br>
<br>
Have looked in to this a bit more.<br>
<br>
An average compression type car air conditioner takes about 3000W<br>
<br>
of power to run. Cooling with peltiers requires 4x this power to get the<br>
<br>
equivalent effect. So 12000W required to keep up with a car air conditioner!<br>
<br>
Peltiers have a typical maximum difference in temperature from one side<br>
<br>
to the other of 70C, but to run at maximum efficiency it is recommended<br>
<br>
to keep the temperature difference at less than 30C. So this would mean<br>
<br>
a peltier rated 72W should be run at around 30W.<br>
<br>
The efficiency also depends on how well you can remove the heat from<br>
<br>
the hot side, as if it gets too hot the heat build up can migrate across to the<br>
<br>
cold side.<br>
<br>
A 1&1/2 x 1&1/2" peltier may be around 72W (12V & 6 A) & cost US $3:61<br>
<br>
Deal Extreme with free shipping....<br>
<br>
<a href="http://m.dx.com/p/tec1-12706-semiconductor-thermoelectric-cooler-peltier-white-157283?stiff=99" rel="noreferrer" target="_blank">http://m.dx.com/p/tec1-12706-<wbr>semiconductor-thermoelectric-<wbr>cooler-peltier-white-157283?<wbr>stiff=99</a><br>
<br>
So to get the same cooling as your car air conditioner you need 166 of these<br>
<br>
& that's running them at full power & not the more economical half power.<br>
<br>
I have read that a peltier air conditioner can drop a cars temperature to 20C<br>
<br>
below ambient, but I don't have any specs on the unit they mention.<br>
<br>
I am going to persevere with them as I am building a small one person sub<br>
<br>
& I like that I can make a dehumidifyer, airconditioner & heater all in one & take<br>
<br>
up little room. As discussed, their heating efficiencies are great, so if you look<br>
<br>
at them as a descent heater with the spin off of some cooling benefit then they<br>
<br>
don't look so bad! Battery technology is leaping forward, so I am anticipating that<br>
<br>
their power drain won't be such a big deal by the time I get around to buying<br>
<br>
batteries.<br>
<br>
Cheers Alan<br>
<br>
<br>
<br>
<br>
<br>
Sent from my iPad<br>
<br>
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Message: 2<br>
Date: Tue, 15 Aug 2017 07:36:20 +1200<br>
From: Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>><br>
To: Personal Submersibles General Discussion<br>
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>><br>
Subject: Re: [PSUBS-MAILIST] Peltier Airconditioner<br>
Message-ID: <<a href="mailto:7C1F9495-599D-460C-9235-5A7D09DC6BD3@yahoo.com">7C1F9495-599D-460C-9235-<wbr>5A7D09DC6BD3@yahoo.com</a>><br>
Content-Type: text/plain; charset="us-ascii"<br>
<br>
Tim,<br>
I was nearly going to mention this; but I was thinking just have<br>
the air flow directed on the occupants.<br>
I have heard mention of clothing with Peltiers in them.<br>
Alan<br>
<br>
<br>
Sent from my iPad<br>
<br>
> On 15/08/2017, at 5:40 AM, T Novak via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>> wrote:<br>
><br>
> 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.<br>
> Tim<br>
><br>
> From: Personal_Submersibles [mailto:<a href="mailto:personal_submersibles-bounces@psubs.org">personal_submersibles-<wbr>bounces@psubs.org</a>] On Behalf Of Alan via Personal_Submersibles;<br>
> Sent: Monday, August 14, 2017 12:08 AM<br>
> To: <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a><br>
> Subject: [PSUBS-MAILIST] Peltier Airconditioner<br>
><br>
> Have looked in to this a bit more.<br>
> An average compression type car air conditioner takes about 3000W<br>
> of power to run. Cooling with peltiers requires 4x this power to get the<br>
> equivalent effect. So 12000W required to keep up with a car air conditioner!<br>
> Peltiers have a typical maximum difference in temperature from one side<br>
> to the other of 70C, but to run at maximum efficiency it is recommended<br>
> to keep the temperature difference at less than 30C. So this would mean<br>
> a peltier rated 72W should be run at around 30W.<br>
> The efficiency also depends on how well you can remove the heat from<br>
> the hot side, as if it gets too hot the heat build up can migrate across to the<br>
> cold side.<br>
> A 1&1/2 x 1&1/2" peltier may be around 72W (12V & 6 A) & cost US $3:61<br>
> Deal Extreme with free shipping....<br>
> <a href="http://m.dx.com/p/tec1-12706-semiconductor-thermoelectric-cooler-peltier-white-157283?stiff=99" rel="noreferrer" target="_blank">http://m.dx.com/p/tec1-12706-<wbr>semiconductor-thermoelectric-<wbr>cooler-peltier-white-157283?<wbr>stiff=99</a><br>
> So to get the same cooling as your car air conditioner you need 166 of these<br>
> & that's running them at full power & not the more economical half power.<br>
> I have read that a peltier air conditioner can drop a cars temperature to 20C<br>
> below ambient, but I don't have any specs on the unit they mention.<br>
> I am going to persevere with them as I am building a small one person sub<br>
> & I like that I can make a dehumidifyer, airconditioner & heater all in one & take<br>
> up little room. As discussed, their heating efficiencies are great, so if you look<br>
> at them as a descent heater with the spin off of some cooling benefit then they<br>
> don't look so bad! Battery technology is leaping forward, so I am anticipating that<br>
> their power drain won't be such a big deal by the time I get around to buying<br>
> batteries.<br>
> Cheers Alan<br>
><br>
><br>
><br>
> Sent from my iPad<br>
> ______________________________<wbr>_________________<br>
> Personal_Submersibles mailing list<br>
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Message: 3<br>
Date: Mon, 14 Aug 2017 12:13:14 -0400<br>
From: Michael Holt via Personal_Submersibles<br>
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>><br>
To: <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a><br>
Subject: Re: [PSUBS-MAILIST] UC3 Nautilus<br>
Message-ID: <<a href="mailto:c75c6c0c-2b37-f92e-a2ad-803ebdc08c0e@ohiohills.com">c75c6c0c-2b37-f92e-a2ad-<wbr>803ebdc08c0e@ohiohills.com</a>><br>
Content-Type: text/plain; charset=utf-8; format=flowed<br>
<br>
On 8/14/2017 1:23 AM, Douglas Suhr via Personal_Submersibles wrote:<br>
> No one would be so stupid as to sink their sub intentionally, right? ~<br>
The blogger has a favorite hate: art replacing engineering. There are<br>
easy ways to anger him, and this was one of them. His background is<br>
aerospace; that appears to result in small-scale and personal projects<br>
irritating him at a subconscious level.<br>
<br>
Other than that, he's a great source of historical aerospace<br>
information. I've always had a particular interest in the Mercury capsule.<br>
<br>
<br>
<br>
Mike<br>
<br>
---<br>
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------------------------------<br>
<br>
Message: 4<br>
Date: Mon, 14 Aug 2017 20:29:10 +0000 (UTC)<br>
From: james cottrell via Personal_Submersibles<br>
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>><br>
To: Personal Submersibles General Discussion<br>
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>><br>
Subject: Re: [PSUBS-MAILIST] UC3 Nautilus<br>
Message-ID: <<a href="mailto:312451248.1589324.1502742550490@mail.yahoo.com">312451248.1589324.<wbr>1502742550490@mail.yahoo.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Mike,<br>
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.<br>
Greg C<br>
<br>
From: Michael Holt via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>><br>
To: <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a><br>
Sent: Monday, August 14, 2017 3:41 PM<br>
Subject: Re: [PSUBS-MAILIST] UC3 Nautilus<br>
<br>
On 8/14/2017 1:23 AM, Douglas Suhr via Personal_Submersibles wrote:<br>
> No one would be so stupid as to sink their sub intentionally, right? ~<br>
The blogger has a favorite hate: art replacing engineering.? There are<br>
easy ways to anger him, and this was one of them.? His background is<br>
aerospace; that appears to result in small-scale and personal projects<br>
irritating him at a subconscious level.<br>
<br>
Other than that, he's a great source of historical aerospace<br>
information. I've always had a particular interest in the Mercury capsule.<br>
<br>
<br>
<br>
Mike<br>
<br>
---<br>
This email has been checked for viruses by Avast antivirus software.<br>
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</blockquote></div><br></div>