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Default What is it called? (An Anti-convection Air Tube?)

On Monday, 3 August 2020 17:50:53 UTC+1, Nick Odell wrote:
I am thinking about constructing a tube to suck hot air from near the
ceiling of a high-ceiling room and reintroduce it and mix it with the
colder air at floor level. I have seen these things at work in other
buildings but I do not know what they are called.

I would like to read a bit more about them and find out if any
improvements from mixing hot air into the cold are worth the effort
but I am stuck by not knowing a suitable search term.

Any suggestions. please?

Nick


Air recirculation.
It tends to arise in domestic air heating systems.

https://www.google.com/search?sxsrf=...=819 &bih=500
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Default What is it called? (An Anti-convection Air Tube?)

On 03/08/2020 20:50, Nick Odell wrote:
I am thinking about constructing a tube to suck hot air from near the
ceiling of a high-ceiling room and reintroduce it and mix it with the
colder air at floor level. I have seen these things at work in other
buildings but I do not know what they are called.

I would like to read a bit more about them and find out if any
improvements from mixing hot air into the cold are worth the effort
but I am stuck by not knowing a suitable search term.

Any suggestions. please?

Nick


Ceiling fan?
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Default What is it called? (An Anti-convection Air Tube?)

I am thinking about constructing a tube to suck hot air from near the
ceiling of a high-ceiling room and reintroduce it and mix it with the
colder air at floor level. I have seen these things at work in other
buildings but I do not know what they are called.

I would like to read a bit more about them and find out if any
improvements from mixing hot air into the cold are worth the effort
but I am stuck by not knowing a suitable search term.

Any suggestions. please?

Nick
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Default What is it called? (An Anti-convection Air Tube?)

On Monday, 3 August 2020 17:50:53 UTC+1, Nick Odell wrote:
I am thinking about constructing a tube to suck hot air from near the
ceiling of a high-ceiling room and reintroduce it and mix it with the
colder air at floor level. I have seen these things at work in other
buildings but I do not know what they are called.


destratification duct

https://www.tombling.com/ducting/destrat.htm

destratification fans are usually used, but adding a duct improves efficiency

Owain
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Default What is it called? (An Anti-convection Air Tube?)

On 03/08/2020 20:50, Nick Odell wrote:
I am thinking about constructing a tube to suck hot air from near the
ceiling of a high-ceiling room and reintroduce it and mix it with the
colder air at floor level. I have seen these things at work in other
buildings but I do not know what they are called.

I would like to read a bit more about them and find out if any
improvements from mixing hot air into the cold are worth the effort
but I am stuck by not knowing a suitable search term.

Any suggestions. please?

Nick

use a fan blowing down instead ?...seen it done in a church used as
offices....


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Default What is it called? (An Anti-convection Air Tube?)

On Mon, 3 Aug 2020 11:19:40 -0700 (PDT), harry
wrote:

On Monday, 3 August 2020 17:50:53 UTC+1, Nick Odell wrote:
I am thinking about constructing a tube to suck hot air from near the
ceiling of a high-ceiling room and reintroduce it and mix it with the
colder air at floor level. I have seen these things at work in other
buildings but I do not know what they are called.

I would like to read a bit more about them and find out if any
improvements from mixing hot air into the cold are worth the effort
but I am stuck by not knowing a suitable search term.

Any suggestions. please?

Nick


Air recirculation.
It tends to arise in domestic air heating systems.

https://www.google.com/search?sxsrf=...=819 &bih=500


Thanks but that is a more sophisticated system than I have in mind.

The thing I am thinking of is nothing more than an open-ended vertical
tube mounted against a wall - one in a school where I used to work was
rectangular section and simply looked like a covering for pipes or
cables.

At one end of the tube is a fan - like a desktop computer fan - and it
sucks the hot air in at the top and blows it out at the bottom to even
out the temperature through the room.

Nick
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Default What is it called? (An Anti-convection Air Tube?)

On Mon, 3 Aug 2020 19:42:56 +0100, Andy Bennet wrote:

On 03/08/2020 20:50, Nick Odell wrote:
I am thinking about constructing a tube to suck hot air from near the
ceiling of a high-ceiling room and reintroduce it and mix it with the
colder air at floor level. I have seen these things at work in other
buildings but I do not know what they are called.

I would like to read a bit more about them and find out if any
improvements from mixing hot air into the cold are worth the effort
but I am stuck by not knowing a suitable search term.

Any suggestions. please?

Nick


Ceiling fan?


That would do the same job but more conspicuously. The tube I have
described in my reply to Harry just sits quetly in the corner of the
room and the airflow is no more than from a quiet desktop computer.

Nick
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Default What is it called? (An Anti-convection Air Tube?)

On Mon, 03 Aug 2020 20:40:07 +0100, Chris Hogg wrote:

On Mon, 03 Aug 2020 19:21:31 -0300, Nick Odell
wrote:

On Mon, 3 Aug 2020 11:19:40 -0700 (PDT), harry
wrote:

On Monday, 3 August 2020 17:50:53 UTC+1, Nick Odell wrote:
I am thinking about constructing a tube to suck hot air from near the
ceiling of a high-ceiling room and reintroduce it and mix it with the
colder air at floor level. I have seen these things at work in other
buildings but I do not know what they are called.

I would like to read a bit more about them and find out if any
improvements from mixing hot air into the cold are worth the effort
but I am stuck by not knowing a suitable search term.

Any suggestions. please?

Nick

Air recirculation.
It tends to arise in domestic air heating systems.

https://www.google.com/search?sxsrf=...=819 &bih=500


Thanks but that is a more sophisticated system than I have in mind.

The thing I am thinking of is nothing more than an open-ended vertical
tube mounted against a wall - one in a school where I used to work was
rectangular section and simply looked like a covering for pipes or
cables.

At one end of the tube is a fan - like a desktop computer fan - and it
sucks the hot air in at the top and blows it out at the bottom to even
out the temperature through the room.

Nick


Where I used to work they had a large and high sectional building
housing the pilot-plant equipment. Despite using industrial heaters it
was always chilly in there, and expensive to run the heaters, until
one bright spark suggested the system you've described. Worked very
well - evened up the temperature from floor to ceiling significantly
and reduced the costs.

Earlier today I was looking at some square-section white PVC guttering
downpipe. That would be ideal for what you want, fitted into the
corner of a room and unobtrusive.


That is exactly the sort of thing I had in mind. Probably done before
redecorating the room so I can paper/paint/blend it in some way so
that it does not look like PVC guttering on the inside wall :-)

Nick
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Default What is it called? (An Anti-convection Air Tube?)

On Mon, 3 Aug 2020 12:54:30 -0700 (PDT),
wrote:

On Monday, 3 August 2020 17:50:53 UTC+1, Nick Odell wrote:
I am thinking about constructing a tube to suck hot air from near the
ceiling of a high-ceiling room and reintroduce it and mix it with the
colder air at floor level. I have seen these things at work in other
buildings but I do not know what they are called.


destratification duct

https://www.tombling.com/ducting/destrat.htm

destratification fans are usually used, but adding a duct improves efficiency

Owain


That is the thing! Thanks for that! And the link takes me somewhere I
can do some calculations to see if it will be worthwhile.

Thanks again,

Nick
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Default What is it called? (An Anti-convection Air Tube?)

On 03/08/2020 23:21, Nick Odell wrote:
On Mon, 3 Aug 2020 11:19:40 -0700 (PDT), harry
wrote:

On Monday, 3 August 2020 17:50:53 UTC+1, Nick Odell wrote:
I am thinking about constructing a tube to suck hot air from near the
ceiling of a high-ceiling room and reintroduce it and mix it with the
colder air at floor level. I have seen these things at work in other
buildings but I do not know what they are called.

I would like to read a bit more about them and find out if any
improvements from mixing hot air into the cold are worth the effort
but I am stuck by not knowing a suitable search term.

Any suggestions. please?

Nick


Air recirculation.
It tends to arise in domestic air heating systems.

https://www.google.com/search?sxsrf=...=819 &bih=500


Thanks but that is a more sophisticated system than I have in mind.

The thing I am thinking of is nothing more than an open-ended vertical
tube mounted against a wall - one in a school where I used to work was
rectangular section and simply looked like a covering for pipes or
cables.

At one end of the tube is a fan - like a desktop computer fan - and it
sucks the hot air in at the top and blows it out at the bottom to even
out the temperature through the room.

Nick

Covid 19 distribution system?

--
"Anyone who believes that the laws of physics are mere social
conventions is invited to try transgressing those conventions from the
windows of my apartment. (I live on the twenty-first floor.) "

Alan Sokal


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Default What is it called? (An Anti-convection Air Tube?)

On 04/08/2020 12:16, The Natural Philosopher wrote:
On 03/08/2020 23:21, Nick Odell wrote:
On Mon, 3 Aug 2020 11:19:40 -0700 (PDT), harry
wrote:

On Monday, 3 August 2020 17:50:53 UTC+1, Nick OdellĀ* wrote:
I am thinking about constructing a tube to suck hot air from near the
ceiling of a high-ceiling room and reintroduce it and mix it with the
colder air at floor level. I have seen these things at work in other
buildings but I do not know what they are called.

I would like to read a bit more about them and find out if any
improvements from mixing hot air into the cold are worth the effort
but I am stuck by not knowing a suitable search term.

Any suggestions. please?

Nick

Air recirculation.
It tends to arise in domestic air heating systems.

https://www.google.com/search?sxsrf=...=819 &bih=500


Thanks but that is a more sophisticated system than I have in mind.

The thing I am thinking of is nothing more than an open-ended vertical
tube mounted against a wall - one in a school where I used to work was
rectangular section and simply looked like a covering for pipes or
cables.

At one end of the tube is a fan - like a desktop computer fan - and it
sucks the hot air in at the top and blows it out at the bottom to even
out the temperature through the room.

Nick

Covid 19 distribution system?


Dust recirculation system
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Default What is it called? (An Anti-convection Air Tube?)

On Tuesday, 4 August 2020 12:16:24 UTC+1, The Natural Philosopher wrote:
Covid 19 distribution system?


Easy enough to put some UV C lights in the tube. The airflow will cool the lights and the lights will disinfect the air.

Owain

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Default What is it called? (An Anti-convection Air Tube?)

On 04/08/2020 17:08, Andrew wrote:
Dust recirculation system


Unlikely. Most dust sinks to the floor; it will be picking up cleaner
air from near the ceiling.

Andy
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Default What is it called? (An Anti-convection Air Tube?)

On Tuesday, 4 August 2020 17:09:16 UTC+1, wrote:
On Tuesday, 4 August 2020 12:16:24 UTC+1, The Natural Philosopher wrote:
Covid 19 distribution system?


Easy enough to put some UV C lights in the tube. The airflow will cool the lights and the lights will disinfect the air.

Owain


Disinfection requires dangerous amounts of UVC not compatible with human occupation.


NT
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Default What is it called? (An Anti-convection Air Tube?)

On Tue, 4 Aug 2020 17:08:25 +0100, Andrew
wrote:

On 04/08/2020 12:16, The Natural Philosopher wrote:
On 03/08/2020 23:21, Nick Odell wrote:
On Mon, 3 Aug 2020 11:19:40 -0700 (PDT), harry
wrote:

On Monday, 3 August 2020 17:50:53 UTC+1, Nick Odell* wrote:
I am thinking about constructing a tube to suck hot air from near the
ceiling of a high-ceiling room and reintroduce it and mix it with the
colder air at floor level. I have seen these things at work in other
buildings but I do not know what they are called.

I would like to read a bit more about them and find out if any
improvements from mixing hot air into the cold are worth the effort
but I am stuck by not knowing a suitable search term.

Any suggestions. please?

Nick

Air recirculation.
It tends to arise in domestic air heating systems.

https://www.google.com/search?sxsrf=...=819 &bih=500


Thanks but that is a more sophisticated system than I have in mind.

The thing I am thinking of is nothing more than an open-ended vertical
tube mounted against a wall - one in a school where I used to work was
rectangular section and simply looked like a covering for pipes or
cables.

At one end of the tube is a fan - like a desktop computer fan - and it
sucks the hot air in at the top and blows it out at the bottom to even
out the temperature through the room.

Nick

Covid 19 distribution system?


Dust recirculation system


It is not supposed to be like a Henry vacuum cleaner on blow: it is a
very gentle displacement of the air with the volume of the room being
turned over roughly 2-4 times an hour.

Nick


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Default What is it called? (An Anti-convection Air Tube?)

On Tuesday, 4 August 2020 23:59:16 UTC+1, wrote:
Easy enough to put some UV C lights in the tube. The airflow will
cool the lights and the lights will disinfect the air.

Disinfection requires dangerous amounts of UVC not compatible with
human occupation.


The UVC would be contained in the air duct.

https://www.puravent.co.uk/blog/in-duct-uv-c/

My point is not that this would be a practical application for the OP; merely refuting the comment that air duct is necessarily a Covid "distribution system".

Owain
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Default What is it called? (An Anti-convection Air Tube?)

On Wednesday, 5 August 2020 09:03:16 UTC+1, wrote:
On Tuesday, 4 August 2020 23:59:16 UTC+1, tabby wrote:


Easy enough to put some UV C lights in the tube. The airflow will
cool the lights and the lights will disinfect the air.

Disinfection requires dangerous amounts of UVC not compatible with
human occupation.


The UVC would be contained in the air duct.

https://www.puravent.co.uk/blog/in-duct-uv-c/

My point is not that this would be a practical application for the OP; merely refuting the comment that air duct is necessarily a Covid "distribution system".

Owain


Necessarily no. Practically yes.
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