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Path: eternal-september.org!reader01.eternal-september.org!.POSTED!not-for-mail
From: Clive Arthur <cliveta@nowaytoday.co.uk
Newsgroups: sci.electronics.design
Subject: Re: Fwd: OT: Items in a metal box are cooler?
Date: Thu, 6 Aug 2020 09:40:03 +0100
Organization: A noiseless patient Spider
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References: <rgdos1$2eo$1@dont-email.me> <rgeq9g$5p5$1@gioia.aioe.org> <rgf9ig$e27$1@dont-email.me> <jehmifhicbd79euo1v3q9rbcpjrevvgppf@4ax.com
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Xref: reader01.eternal-september.org sci.electronics.design:604109
On 06/08/2020 00:52, John Larkin wrote:
On Wed, 5 Aug 2020 22:50:08 +0100, Clive Arthur
cliveta@nowaytoday.co.uk> wrote:
On 05/08/2020 18:29, Corvid wrote:
Metal is cooler than ambient temperature?
Is the temperature inside of a metal box cooler than ambient
temperature?
I need to look. If that is so. Can be used for storing medicine and
maybe other things.
I have a metal box in my kitchen and the temperature inside is
definitely cooler than ambient. I use it for storing things other than
medicine.
If you put a metal box inside a metal box, it would get even colder!
Use that to store ice cream.
No, I have another metal box in the cellar for that, it gets to about
-20C. Not sure what that is in US standard arcane units, but cold
enough to freeze the balls off a brass monkey anyway.
--
Cheers
Clive
On 05/08/2020 18:29, Corvid wrote:
Metal is cooler than ambient temperature?
Is the temperature inside of a metal box cooler than ambient
temperature?
I need to look. If that is so. Can be used for storing medicine and
maybe other things.
I have a metal box in my kitchen and the temperature inside is
definitely cooler than ambient. I use it for storing things other than
medicine.
On 2020-08-05 17:50, Clive Arthur wrote:
On 05/08/2020 18:29, Corvid wrote:
Metal is cooler than ambient temperature?
Is the temperature inside of a metal box cooler than ambient
temperature?
I need to look. If that is so. Can be used for storing medicine and
maybe other things.
I have a metal box in my kitchen and the temperature inside is
definitely cooler than ambient. I use it for storing things other than
medicine.
I have one of those too, and another one where it\'s sometimes much much
warmer than ambient, but weirdly it doesn\'t do it all the time. (More
often in cooler weather, I notice.)
The really mysterious one is this metal cup I\'m drinking from right now.
\"It\'s the greatest invention in the world! It keeps hot things hot and
cold things cold!...how _do_ it know?\"
Cheers
Phil Hobbs
On 06/08/2020 04:15, John Doe wrote:
1. I did not post to this group, a nym-shifting stalker troll did
that.
2. I have already made perfectly clear in follow-up posts that my
post elsewhere was mistaken.
If you were seriously interested in doing something that would work and
does not break the laws of thermodynamics there are now a handful of
metamaterials that are essentially a mirror finish in visible and near
IR and almost black in the thermal band for emitting.
In direct sunlight in a clear blue sky they can be 10C cooler than the
air. 7C is more typical. I wonder how clean you need to keep them.
https://www.nature.com/articles/d41586-019-03911-8
3. There is no need to pollute this thread/group with more netcop
garbage when you are not cognizant enough to see what has
transpired.
That is really funny coming from a self appointed netcop that does
nothing but repost OT threads and headers into this group.
But that is the way of trolls (at least two, from Australia and New
Zealand, in this short subthread)...
You ought to know.
On Thu, 6 Aug 2020 09:52:12 +0100, Martin Brown
\'\'\'newspam\'\'\'@nonad.co.uk> wrote:
On 06/08/2020 04:15, John Doe wrote:
1. I did not post to this group, a nym-shifting stalker troll did
that.
2. I have already made perfectly clear in follow-up posts that my
post elsewhere was mistaken.
If you were seriously interested in doing something that would work and
does not break the laws of thermodynamics there are now a handful of
metamaterials that are essentially a mirror finish in visible and near
IR and almost black in the thermal band for emitting.
In direct sunlight in a clear blue sky they can be 10C cooler than the
air. 7C is more typical. I wonder how clean you need to keep them.
https://www.nature.com/articles/d41586-019-03911-8
3. There is no need to pollute this thread/group with more netcop
garbage when you are not cognizant enough to see what has
transpired.
That is really funny coming from a self appointed netcop that does
nothing but repost OT threads and headers into this group.
But that is the way of trolls (at least two, from Australia and New
Zealand, in this short subthread)...
You ought to know.
I you built a good reflector (copper bowl, copperclad FR4, something
like that) and put something at the focal point, and point it at the
sky at night, I wonder how cold you could make the thing.
I you built a good reflector (copper bowl, copperclad FR4, something
like that) and put something at the focal point, and point it at the
sky at night, I wonder how cold you could make the thing.
I you built a good reflector (copper bowl, copperclad FR4, something
like that) and put something at the focal point, and point it at the
sky at night, I wonder how cold you could make the thing.
Tall parabolic shape maybe, the opposite of a solar furnace.
This would obviously be a little bit of free energy.
On Thursday, August 6, 2020 at 1:57:10 PM UTC-7, John Larkin wrote:
I you built a good reflector (copper bowl, copperclad FR4, something
like that) and put something at the focal point, and point it at the
sky at night, I wonder how cold you could make the thing.
Tnere\'s no need of focus, just a sunshield and insulation will do it.
Works best in vacuum. Ideally, you\'d have several layers of shield
at successively lower temperatures, and site the object near one of Luna\'s
poles.
torsdag den 6. august 2020 kl. 22.57.10 UTC+2 skrev John Larkin:
On Thu, 6 Aug 2020 09:52:12 +0100, Martin Brown
\'\'\'newspam\'\'\'@nonad.co.uk> wrote:
On 06/08/2020 04:15, John Doe wrote:
1. I did not post to this group, a nym-shifting stalker troll did
that.
2. I have already made perfectly clear in follow-up posts that my
post elsewhere was mistaken.
If you were seriously interested in doing something that would work and
does not break the laws of thermodynamics there are now a handful of
metamaterials that are essentially a mirror finish in visible and near
IR and almost black in the thermal band for emitting.
In direct sunlight in a clear blue sky they can be 10C cooler than the
air. 7C is more typical. I wonder how clean you need to keep them.
https://www.nature.com/articles/d41586-019-03911-8
3. There is no need to pollute this thread/group with more netcop
garbage when you are not cognizant enough to see what has
transpired.
That is really funny coming from a self appointed netcop that does
nothing but repost OT threads and headers into this group.
But that is the way of trolls (at least two, from Australia and New
Zealand, in this short subthread)...
You ought to know.
I you built a good reflector (copper bowl, copperclad FR4, something
like that) and put something at the focal point, and point it at the
sky at night, I wonder how cold you could make the thing.
I don\'t see how a reflector is going to help make something cold
torsdag den 6. august 2020 kl. 22.57.10 UTC+2 skrev John Larkin:
On Thu, 6 Aug 2020 09:52:12 +0100, Martin Brown
\'\'\'newspam\'\'\'@nonad.co.uk> wrote:
On 06/08/2020 04:15, John Doe wrote:
1. I did not post to this group, a nym-shifting stalker troll did
that.
2. I have already made perfectly clear in follow-up posts that my
post elsewhere was mistaken.
If you were seriously interested in doing something that would work and
does not break the laws of thermodynamics there are now a handful of
metamaterials that are essentially a mirror finish in visible and near
IR and almost black in the thermal band for emitting.
In direct sunlight in a clear blue sky they can be 10C cooler than the
air. 7C is more typical. I wonder how clean you need to keep them.
https://www.nature.com/articles/d41586-019-03911-8
3. There is no need to pollute this thread/group with more netcop
garbage when you are not cognizant enough to see what has
transpired.
That is really funny coming from a self appointed netcop that does
nothing but repost OT threads and headers into this group.
But that is the way of trolls (at least two, from Australia and New
Zealand, in this short subthread)...
You ought to know.
I you built a good reflector (copper bowl, copperclad FR4, something
like that) and put something at the focal point, and point it at the
sky at night, I wonder how cold you could make the thing.
I don\'t see how a reflector is going to help make something cold
On Thu, 6 Aug 2020 14:04:04 -0700 (PDT), Lasse Langwadt Christensen
langwadt@fonz.dk> wrote:
torsdag den 6. august 2020 kl. 22.57.10 UTC+2 skrev John Larkin:
On Thu, 6 Aug 2020 09:52:12 +0100, Martin Brown
\'\'\'newspam\'\'\'@nonad.co.uk> wrote:
On 06/08/2020 04:15, John Doe wrote:
1. I did not post to this group, a nym-shifting stalker troll did
that.
2. I have already made perfectly clear in follow-up posts that my
post elsewhere was mistaken.
If you were seriously interested in doing something that would work and
does not break the laws of thermodynamics there are now a handful of
metamaterials that are essentially a mirror finish in visible and near
IR and almost black in the thermal band for emitting.
In direct sunlight in a clear blue sky they can be 10C cooler than the
air. 7C is more typical. I wonder how clean you need to keep them.
https://www.nature.com/articles/d41586-019-03911-8
3. There is no need to pollute this thread/group with more netcop
garbage when you are not cognizant enough to see what has
transpired.
That is really funny coming from a self appointed netcop that does
nothing but repost OT threads and headers into this group.
But that is the way of trolls (at least two, from Australia and New
Zealand, in this short subthread)...
You ought to know.
I you built a good reflector (copper bowl, copperclad FR4, something
like that) and put something at the focal point, and point it at the
sky at night, I wonder how cold you could make the thing.
I don\'t see how a reflector is going to help make something cold
Space has a radiative temperature of a few K. A blackbody way out in
space will eventually get that cold. On Earth, we\'d need it to think
it\'s in space, namely all that it sees in all directions looks like
space. We wouldn\'t want it to be exposed to anything warm, like the
ground.
A deep gold-plated parabola would be good, aiming at the sky.
Thin walled SS is a pretty good metallic insulator.On 2020-08-05 17:50, Clive Arthur wrote:
On 05/08/2020 18:29, Corvid wrote:
Metal is cooler than ambient temperature?
Is the temperature inside of a metal box cooler than ambient
temperature?
I need to look. If that is so. Can be used for storing medicine and
maybe other things.
I have a metal box in my kitchen and the temperature inside is
definitely cooler than ambient. I use it for storing things other than
medicine.
I have one of those too, and another one where it\'s sometimes much much
warmer than ambient, but weirdly it doesn\'t do it all the time. (More
often in cooler weather, I notice.)
The really mysterious one is this metal cup I\'m drinking from right now.
\"It\'s the greatest invention in the world! It keeps hot things hot and
cold things cold!...how _do_ it know?\"
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510
http://electrooptical.net
http://hobbs-eo.com
On 06/08/2020 21:57, John Larkin wrote:
I you built a good reflector (copper bowl, copperclad FR4, something
like that) and put something at the focal point, and point it at the
sky at night, I wonder how cold you could make the thing.
If you want to try it a shallow polished metal dish just big enough to
hide the ground from another shallow unglazed clay dish on expanded
polystyrene is the way to do it. Thin layer of water in the clay dish.
Egyptian technology that could make ice in the desert on a good clear
night by a combination of wind chill and radiative cooling. They would
have used straw to isolate it from the warm ground.
https://www.realclearscience.com/blog/2018/07/09/how_people_created_ice_in_the_desert_2000_years_ago.html
Tall parabolic shape maybe, the opposite of a solar furnace.
This would obviously be a little bit of free energy.
On Thursday, August 6, 2020 at 3:29:58 PM UTC-4, Phil Hobbs wrote:
On 2020-08-05 17:50, Clive Arthur wrote:
On 05/08/2020 18:29, Corvid wrote:
Metal is cooler than ambient temperature?
Is the temperature inside of a metal box cooler than ambient
temperature?
I need to look. If that is so. Can be used for storing medicine and
maybe other things.
I have a metal box in my kitchen and the temperature inside is
definitely cooler than ambient. I use it for storing things other than
medicine.
I have one of those too, and another one where it\'s sometimes much much
warmer than ambient, but weirdly it doesn\'t do it all the time. (More
often in cooler weather, I notice.)
The really mysterious one is this metal cup I\'m drinking from right now.
\"It\'s the greatest invention in the world! It keeps hot things hot and
cold things cold!...how _do_ it know?\"
Thin walled SS is a pretty good metallic insulator.
Silver plated glass (or some such) was the first Dewar. :^)
George H.
On 2020-08-06 18:45, George Herold wrote:
On Thursday, August 6, 2020 at 3:29:58 PM UTC-4, Phil Hobbs wrote:
On 2020-08-05 17:50, Clive Arthur wrote:
On 05/08/2020 18:29, Corvid wrote:
Metal is cooler than ambient temperature?
Is the temperature inside of a metal box cooler than ambient
temperature?
I need to look. If that is so. Can be used for storing medicine and
maybe other things.
I have a metal box in my kitchen and the temperature inside is
definitely cooler than ambient. I use it for storing things other than
medicine.
I have one of those too, and another one where it\'s sometimes much much
warmer than ambient, but weirdly it doesn\'t do it all the time. (More
often in cooler weather, I notice.)
The really mysterious one is this metal cup I\'m drinking from right now.
\"It\'s the greatest invention in the world! It keeps hot things hot and
cold things cold!...how _do_ it know?\"
Thin walled SS is a pretty good metallic insulator.
Silver plated glass (or some such) was the first Dewar. :^)
George H.
Right, but we\'re all busy teasing \"John Doe\" at the moment, because that
nym desperately deserves it for all those sanctimonious posts about
\"silly trolls\" and so on.
I wonder if anyone\'s mom ever named anyone \"John Doe\". (Or for that
matter, \"Fred Bloggs\" or \"Larry Lunchbucket\" (rough USAian for \"Fred
Bloggs\").)
I you built a good reflector (copper bowl, copperclad FR4, something
like that) and put something at the focal point, and point it at the
sky at night, I wonder how cold you could make the thing.
Tall parabolic shape maybe, the opposite of a solar furnace.
This would obviously be a little bit of free energy.
On Thu, 6 Aug 2020 21:45:12 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:
I wonder if anyone\'s mom ever named anyone \"John Doe\". (Or for that
matter, \"Fred Bloggs\" or \"Larry Lunchbucket\" (rough USAian for \"Fred
Bloggs\").)
He must be a criminal. He seems to spend a lot of time in courts.
On Thu, 6 Aug 2020 21:45:12 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:
On 2020-08-06 18:45, George Herold wrote:
On Thursday, August 6, 2020 at 3:29:58 PM UTC-4, Phil Hobbs wrote:
On 2020-08-05 17:50, Clive Arthur wrote:
On 05/08/2020 18:29, Corvid wrote:
Metal is cooler than ambient temperature?
Is the temperature inside of a metal box cooler than ambient
temperature?
I need to look. If that is so. Can be used for storing medicine and
maybe other things.
I have a metal box in my kitchen and the temperature inside is
definitely cooler than ambient. I use it for storing things other than
medicine.
I have one of those too, and another one where it\'s sometimes much much
warmer than ambient, but weirdly it doesn\'t do it all the time. (More
often in cooler weather, I notice.)
The really mysterious one is this metal cup I\'m drinking from right now.
\"It\'s the greatest invention in the world! It keeps hot things hot and
cold things cold!...how _do_ it know?\"
Thin walled SS is a pretty good metallic insulator.
Silver plated glass (or some such) was the first Dewar. :^)
George H.
Right, but we\'re all busy teasing \"John Doe\" at the moment, because that
nym desperately deserves it for all those sanctimonious posts about
\"silly trolls\" and so on.
I wonder if anyone\'s mom ever named anyone \"John Doe\". (Or for that
matter, \"Fred Bloggs\" or \"Larry Lunchbucket\" (rough USAian for \"Fred
Bloggs\").)
He must be a criminal. He seems to spend a lot of time in courts.
I think he turns up in morgues a lot.
How can you keep reappearing in the >morgue???
Path: eternal-september.org!reader01.eternal-september.org!.POSTED!not-for-mail
From: Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net
Newsgroups: sci.electronics.design
Subject: Re: Fwd: OT: Items in a metal box are cooler?
Date: Thu, 6 Aug 2020 21:45:12 -0400
Organization: A noiseless patient Spider
Lines: 43
Message-ID: <203b32b9-1a33-1137-44ba-f276614598b4@electrooptical.net
References: <rgdos1$2eo$1@dont-email.me> <rgeq9g$5p5$1@gioia.aioe.org> <rgf9ig$e27$1@dont-email.me> <rghlnf$sbr$1@gioia.aioe.org> <59d56d22-f3e9-42d0-9293-a49513da7c9fo@googlegroups.com
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Xref: reader01.eternal-september.org sci.electronics.design:604218
On 2020-08-06 18:45, George Herold wrote:
On Thursday, August 6, 2020 at 3:29:58 PM UTC-4, Phil Hobbs wrote:
On 2020-08-05 17:50, Clive Arthur wrote:
On 05/08/2020 18:29, Corvid wrote:
Metal is cooler than ambient temperature?
Is the temperature inside of a metal box cooler than ambient
temperature?
I need to look. If that is so. Can be used for storing medicine and
maybe other things.
I have a metal box in my kitchen and the temperature inside is
definitely cooler than ambient.¶ÿ I use it for storing things other than
medicine.
I have one of those too, and another one where it\'s sometimes much much
warmer than ambient, but weirdly it doesn\'t do it all the time. (More
often in cooler weather, I notice.)
The really mysterious one is this metal cup I\'m drinking from right now.
\"It\'s the greatest invention in the world! It keeps hot things hot and
cold things cold!...how _do_ it know?\"
Thin walled SS is a pretty good metallic insulator.
Silver plated glass (or some such) was the first Dewar. :^)
George H.
Right, but we\'re all busy teasing \"John Doe\" at the moment, because that
nym desperately deserves it for all those sanctimonious posts about
\"silly trolls\" and so on.
I wonder if anyone\'s mom ever named anyone \"John Doe\". (Or for that
matter, \"Fred Bloggs\" or \"Larry Lunchbucket\" (rough USAian for \"Fred
Bloggs\").)
Cheers
Phil Hobbs