Heat powered stove fan

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Heat powered stove fan
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Rural Rambler

Joined: 19 Sep 2016
Posts: 6

Posted: Sun Jan 28, 18 7:03 pm Post subject: Heat powered stove fan
Best little thing i've bought in ages. They are in Aldi today. If you have a wood-burning stove then I recommend sticking one of these on top of it.

sean
Downsizer Moderator

Joined: 28 Oct 2004
Posts: 42219
Location: North Devon

Posted: Sun Jan 28, 18 7:40 pm Post subject:
Keep meaning to get one. Bit late in the evening for popping over to Aldi now.

Hairyloon

Joined: 20 Nov 2008
Posts: 15461
Location: Today I are mostly being in Yorkshire.

Posted: Mon Jan 29, 18 9:19 am Post subject:

sean wrote:

Keep meaning to get one. Bit late in the evening for popping over to Aldi now.

Don't leave it too long: they sell fast.

Anybody here tried making one? Is on my todo list...

dpack

Joined: 02 Jul 2005
Posts: 46417
Location: yes

Posted: Mon Jan 29, 18 1:34 pm Post subject:

i had a quick look at the power supply end , aldi will be cheaper than making a practical one.

ps heat gradient= leccy can be done a few ways that have no moving parts but there seems to be a gap in the tech between tiny(like a small fan or maybe slowly charging a phone battery ) and quite big or dangeroos (heat to power at factory scale or a just sub critical lump of plutonium and the cold darkness of deep space to power a long life exploration platform ).

gz

Joined: 23 Jan 2009
Posts: 9000
Location: Ayrshire, Scotland

Posted: Mon Jan 29, 18 5:34 pm Post subject:
No power in a stove fan, just uses convection

Nick

Joined: 02 Nov 2004
Posts: 34535
Location: Hereford

Posted: Mon Jan 29, 18 7:04 pm Post subject:
Lots of power. And you’d never make one for close to the money needed to buy one.

Hairyloon

Joined: 20 Nov 2008
Posts: 15461
Location: Today I are mostly being in Yorkshire.

Posted: Tue Jan 30, 18 4:56 pm Post subject:

dpack wrote:

i had a quick look at the power supply end , aldi will be cheaper than making a practical one.

Nah, you can get a thermoelectric cell for a couple of quid, a motor for pennies and the rest of it is just bits of aluminium.

dpack

Joined: 02 Jul 2005
Posts: 46417
Location: yes

Posted: Tue Jan 30, 18 5:53 pm Post subject:
there are cells and cells.

Hairyloon

Joined: 20 Nov 2008
Posts: 15461
Location: Today I are mostly being in Yorkshire.

Posted: Tue Jan 30, 18 6:01 pm Post subject:

dpack wrote:

there are cells and cells.

There are, but I don't think it is working hard.

dpack

Joined: 02 Jul 2005
Posts: 46417
Location: yes

Posted: Tue Jan 30, 18 7:24 pm Post subject:
not hard but it is very hot on one side

Hairyloon

Joined: 20 Nov 2008
Posts: 15461
Location: Today I are mostly being in Yorkshire.

Posted: Tue Jan 30, 18 9:10 pm Post subject:

dpack wrote:

not hard but it is very hot on one side

How hot, do you know?

Thermal transfer depends on the design of the base, and it's blowing a stream of cooler air over it... shouldn't get that hot.

Nick

Joined: 02 Nov 2004
Posts: 34535
Location: Hereford

Posted: Tue Jan 30, 18 9:22 pm Post subject:
The thermometer on my stove reads 2-300C. Unsure how accurate it is. And the fan sits on that. I can get a much more accurate reading if you need one.

Hairyloon

Joined: 20 Nov 2008
Posts: 15461
Location: Today I are mostly being in Yorkshire.

Posted: Tue Jan 30, 18 9:51 pm Post subject:

Nick wrote:

The thermometer on my stove reads 2-300C. Unsure how accurate it is. And the fan sits on that. I can get a much more accurate reading if you need one.

No, that's fine. Is just to get an idea. Do you get it up the high end often?

Nick

Joined: 02 Nov 2004
Posts: 34535
Location: Hereford

Posted: Wed Jan 31, 18 6:33 am Post subject:
Yeah. I’ll recheck the figures next time it’s on.

Mistress Rose

Joined: 21 Jul 2011
Posts: 16158

Posted: Wed Jan 31, 18 8:25 am Post subject:

You would need to have all electronics and electrics well away from the heat source. I wouldn't expect domestic electronics to be useable above 125 C, or even lower. Temperature cycling is also the most stressful test for electronics, so repeat, keep them away from the heat source or they will fail quite quickly. We used to use that as a test when I was working in the industry, and short of keep turning things on and off, it was the best way to get them to fail.

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