Home Page
   Articles
       links
About Us    
Traders        
Recipes            
Latest Articles
One of them fans wot sits on a log burner.
Page Previous  1, 2, 3  Next
 
Post new topic   Reply to topic    Downsizer Forum Index -> Energy Efficiency and Construction/Major Projects
Author 
 Message
Nick



Joined: 02 Nov 2004
Posts: 33569
Location: Hereford
PostPosted: Sun Sep 25, 16 5:22 pm    Post subject:  Reply with quote    

joanne wrote:
Nick wrote:
joanne wrote:
We managed to get one today in one of our local Aldi's - Thanks Nick for highlighting this offer


Welcome. I couldn't find the other threads about them, tho. So I couldn't remember who wanted one.

Ps (just for you) Sisters of Mercy on tour...


I know so is the Mission with Pete Murphy and we are seeing The Cure in November


Bah, Mission, schmission. (But, yes, I have tickets to the other two)

Jamanda
Downsizer Moderator


Joined: 22 Oct 2006
Posts: 34865
Location: Devon
PostPosted: Sun Sep 25, 16 6:22 pm    Post subject: Reply with quote    

joanne wrote:
dpack wrote:
what powers the thing to make it spin ?


Conduction I believe, as the stove heats up the fan begins to turns pushing the warm air out around the house


Convection I'd have thought.

Treacodactyl
Downsizer Moderator


Joined: 28 Oct 2004
Posts: 25697
Location: Jumping on the bandwagon of opportunism
PostPosted: Sun Sep 25, 16 6:35 pm    Post subject: Reply with quote    

Jamanda wrote:
joanne wrote:
dpack wrote:
what powers the thing to make it spin ?


Conduction I believe, as the stove heats up the fan begins to turns pushing the warm air out around the house


Convection I'd have thought.


As the base is touching the fire the main heat source would be conduction wouldn't it?

Anyway, more details here: http://www.ecofan.co.uk/technical-information.html

dpack



Joined: 02 Jul 2005
Posts: 32591
Location: yes
PostPosted: Sun Sep 25, 16 7:07 pm    Post subject: Reply with quote    

i looked it up with nick's help above.

conduction makes 2 different semiconductors hot ,that drives an electron flow across the junction where they meet, each has a wire that goes to the motor, that current drives the fan.

very simple but rather clever

Jamanda
Downsizer Moderator


Joined: 22 Oct 2006
Posts: 34865
Location: Devon
PostPosted: Sun Sep 25, 16 8:19 pm    Post subject: Reply with quote    

But a bit more complicated than I thunk. I assumed it would be like the tin foil fans we make at work and hang over the Bunsens.

Nick



Joined: 02 Nov 2004
Posts: 33569
Location: Hereford
PostPosted: Sun Sep 25, 16 8:37 pm    Post subject: Reply with quote    

Jamanda wrote:
But a bit more complicated than I thunk. I assumed it would be like the tin foil fans we make at work and hang over the Bunsens.


Nope. It doesn't need hot air. It needs hot contact to generate electricity.

dpack



Joined: 02 Jul 2005
Posts: 32591
Location: yes
PostPosted: Sun Sep 25, 16 9:29 pm    Post subject: Reply with quote    

there are a few examples of the two types being used in a practical way.

gas radio was part of the gas companies' fight back against domestic electrification ,they had cooking and lighting ,even fridges but radio was an electric thing most folk wanted and battery radios were very limited in amplifier power and batteries need swapping every few days so a gas radio could stop them getting electric and converting everything else . gas radio uses a single semiconductor hot at one end and cooled by fins at the other to drive the electron flow (same principle as the soviet paraffin radio sets).

the thermo-electric power units of early space satellites was similar but with heat from plutonium decay as the primary energy input on the hot end and the fins cooled by ir radiation into space. fun but not ideal at home.

before decent battery tech the same principle was used as a compact ,light power supply to run the targeting and steering electronics of some missiles with the heat coming from the solid fuel motor (and / or pre heating before launch ), and if they only need to work for a short time a heat sink does the cold end job , i dont know if it was used on bigger stuff that needed to fly for a while . im not sure if the two semiconductor type has been used for this but it could be.

these are a bit more advanced than the hot/cold sort in that the properties of the two different sides of the semi conductor unit have different free electron pressure at the same (quite warm ) temp and so don't need a cold part therefore being perfect for a stove fan

very very tidy for somebody to find a "simple" hi tech solution to making a low tech thing like a wood burner work far better.

Hairyloon



Joined: 20 Nov 2008
Posts: 14556
Location: Today I are mostly being in Yorkshire.
PostPosted: Sun Sep 25, 16 10:05 pm    Post subject: Reply with quote    

I'm a little surprised at how thin on the ground are Stirling engines for this kind of application.
I've got one made principally out of cardboard and milk bottle tops. Obviously no good for a stove top, but it establishes the principle and the simplicity.

dpack



Joined: 02 Jul 2005
Posts: 32591
Location: yes
PostPosted: Mon Sep 26, 16 1:07 am    Post subject: Reply with quote    

stirling engines are another rather neat bit of tech but nowhere as tidy as these wee things

Hairyloon



Joined: 20 Nov 2008
Posts: 14556
Location: Today I are mostly being in Yorkshire.
PostPosted: Mon Sep 26, 16 7:31 am    Post subject: Reply with quote    

dpack wrote:
stirling engines are another rather neat bit of tech but nowhere as tidy as these wee things

Tidiness is overrated.

vegplot



Joined: 19 Apr 2007
Posts: 21297
Location: Ynys Môn
PostPosted: Mon Sep 26, 16 11:46 am    Post subject: Reply with quote    

Hairyloon wrote:
I'm a little surprised at how thin on the ground are Stirling engines for this kind of application.
I've got one made principally out of cardboard and milk bottle tops. Obviously no good for a stove top, but it establishes the principle and the simplicity.


They're more expensive presumably because of their relative mechanical complexity compared to solid state versions.

Hairyloon



Joined: 20 Nov 2008
Posts: 14556
Location: Today I are mostly being in Yorkshire.
PostPosted: Mon Sep 26, 16 12:34 pm    Post subject: Reply with quote    

vegplot wrote:
Hairyloon wrote:
I'm a little surprised at how thin on the ground are Stirling engines for this kind of application.
I've got one made principally out of cardboard and milk bottle tops. Obviously no good for a stove top, but it establishes the principle and the simplicity.


They're more expensive presumably because of their relative mechanical complexity compared to solid state versions.

Arguably they are no more complex, but they cannot be simply assembled from off the shelf components and simple castings.

Nick



Joined: 02 Nov 2004
Posts: 33569
Location: Hereford
PostPosted: Mon Sep 26, 16 12:57 pm    Post subject: Reply with quote    

Hairyloon wrote:
vegplot wrote:
Hairyloon wrote:
I'm a little surprised at how thin on the ground are Stirling engines for this kind of application.
I've got one made principally out of cardboard and milk bottle tops. Obviously no good for a stove top, but it establishes the principle and the simplicity.


They're more expensive presumably because of their relative mechanical complexity compared to solid state versions.

Arguably they are no more complex, but they cannot be simply assembled from off the shelf components and simple castings.


Do they have more moving parts?

dpack



Joined: 02 Jul 2005
Posts: 32591
Location: yes
PostPosted: Mon Sep 26, 16 2:20 pm    Post subject: Reply with quote    

i recon a basic version could be adapted from a V or flat twin cylinder motorbike engine ,the magneto and a few bits of pipe.

ed ps im not manhauling that sort of thing around just to charge my phone and headtorch

a bi semi rig with a small "black box" to give a usable voltage could be a very toteable couple of hundred grams, certainly smaller than suitable ,current generation, pv panels with control gear and it works while you cook/make coffee etc even in a arctic winter or thick jungle

Last edited by dpack on Mon Sep 26, 16 2:30 pm; edited 1 time in total

Treacodactyl
Downsizer Moderator


Joined: 28 Oct 2004
Posts: 25697
Location: Jumping on the bandwagon of opportunism
PostPosted: Mon Sep 26, 16 2:28 pm    Post subject: Reply with quote    

Midlandsman wrote:
If ALDI don't restock, you can get one for the same price here:

http://www.warriorstoves.co.uk/Catalogue/Fireside/Heating-Accessories/Stove-Fan-2-Blade-ELITE-19cm-Compact-Various-Finishes


Thanks for that. My Aldi sold out of 30 in a few minutes.

Does anyone know if some makes are better than others? I don't mind paying more for one that'll move more air around.

Post new topic   Reply to topic    Downsizer Forum Index -> Energy Efficiency and Construction/Major Projects All times are GMT
Page Previous  1, 2, 3  Next
Page 2 of 3
View Latest Posts View Latest Posts

 

Archive
Powered by php-BB © 2001, 2005 php-BB Group
Style by marsjupiter.com, released under GNU (GNU/GPL) license.
Copyright © 2004 marsjupiter.com

<-- -->