One of them fans wot sits on a log burner.

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One of them fans wot sits on a log burner.
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dpack

Joined: 02 Jul 2005
Posts: 46207
Location: yes

Posted: Mon Sep 26, 16 2:36 pm Post subject:
there might be some pointers here there was rather a lot to go through it and pick a good un.

dpack

Joined: 02 Jul 2005
Posts: 46207
Location: yes

Posted: Mon Sep 26, 16 3:20 pm Post subject:
what ever make of fan i recon it needs this type of chip rather than the sort found in solid state wine coolers etc which are not suitable for power gen or hot places

Ty Gwyn

Joined: 22 Sep 2010
Posts: 4613
Location: Lampeter

Posted: Mon Sep 26, 16 7:10 pm Post subject:

dpack wrote:

there might be some pointers here there was rather a lot to go through it and pick a good un.

There`s sure a big difference in prices there.

dpack

Joined: 02 Jul 2005
Posts: 46207
Location: yes

Posted: Mon Sep 26, 16 8:13 pm Post subject:

Ty Gwyn wrote:

dpack wrote:

there might be some pointers here there was rather a lot to go through it and pick a good un.

There`s sure a big difference in prices there.

yep ,my next thought is that if the aldi ones work and they do'nt restock looking online for the same model might be a good idea. with a lot of "non brand"stuff they make loads and various folk sell em.

Hairyloon

Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.

Posted: Mon Sep 26, 16 10:21 pm Post subject:

dpack wrote:

what ever make of fan i recon it needs this type of chip rather than the sort found in solid state wine coolers etc which are not suitable for power gen or hot places

At that price, Aldi can't be making much.

Ty Gwyn

Joined: 22 Sep 2010
Posts: 4613
Location: Lampeter

Posted: Mon Sep 26, 16 10:26 pm Post subject:

Hairyloon wrote:

dpack wrote:

what ever make of fan i recon it needs this type of chip rather than the sort found in solid state wine coolers etc which are not suitable for power gen or hot places

At that price, Aldi can't be making much.

Don`t know,cheap enough when imported by the thousands from China.

Hairyloon

Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.

Posted: Tue Sep 27, 16 12:02 am Post subject:

Ty Gwyn wrote:

Hairyloon wrote:

dpack wrote:

what ever make of fan i recon it needs this type of chip rather than the sort found in solid state wine coolers etc which are not suitable for power gen or hot places

At that price, Aldi can't be making much.

Don`t know,cheap enough when imported by the thousands from China.

Hong Kong appears favourite.

Nick

Joined: 02 Nov 2004
Posts: 34535
Location: Hereford

Posted: Tue Sep 27, 16 9:48 am Post subject:
Stuffs made in Mainland china and sold via Hong Kong often. No idea why. Tax or language barriers would be my guess.

dpack

Joined: 02 Jul 2005
Posts: 46207
Location: yes

Posted: Tue Sep 27, 16 10:56 am Post subject:

iirc tax and language and the residual trade/traders links from 100 yrs of colonialism and it has a very nice deep water harbour in a convenient place.

ps the proper chips are probably a couple of quid each if one gets a big box of em, same for the castings and motors . at a guess aldi as last link in the chain make a fiver tops on them but say 20000 x �5 is worth doing and a stove fan for �25 seems a good deal compared to some of the online prices for the things.

Hairyloon

Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.

Posted: Tue Sep 27, 16 6:37 pm Post subject:

Nick wrote:

Hairyloon wrote:

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?

They do, but complexity is not just about moving parts: is a silicon chip complex?
And an electric motor is quite a complex bit off engineering, but they are made by the billion for multiple applications.

Nick

Joined: 02 Nov 2004
Posts: 34535
Location: Hereford

Posted: Tue Sep 27, 16 6:57 pm Post subject:
No, but as a relating engineer, it's almost always moving parts that let you down. A chip is simple for the owner. They don't tend to fail. Motors do.

john of wessex

Joined: 18 Jun 2007
Posts: 2130

Posted: Tue Sep 27, 16 8:19 pm Post subject:
The explanation I have seen of Lidl's business model is that the suppliers don't make a large profit, BUT the numbers they buy are huge and unlike the 'non discount' supermarkets they don't muck the suppliers about, so they are keen to do business with them

Dee J

Joined: 22 May 2005
Posts: 342
Location: West Devon

Posted: Wed Sep 28, 16 3:58 am Post subject:

dpack wrote:

Hairyloon wrote:

dpack wrote:

thanks, i had wondered if it was a similar principle to stalin's paraffin radios with a hot bit and a cool bit but it is different semis at the same temp...

Next question: are they reversible? If you spin the fan, does it pump heat across the junction?

i dought it as that sort of stuff often has diodes but if not the semis might get over warm at the junction and possibly break .

They are reversible to a degree. The Peltier effect semiconductor device used to generate the electricity is of the same basic type as the unit in an electric cool box... when an applied voltage does indeed make one side hot and one cool (ie pump heat) the applied polarity controls the heat flow direction. So on the stove fan.. if you spin the fan the motor will act as a dynamo and the Peltier unit will pump heat....

Mistress Rose

Joined: 21 Jul 2011
Posts: 15966

Posted: Wed Sep 28, 16 5:58 am Post subject:

Silicon chips, by the time they get into something, either work or they don't. The failure is at a far earlier stage. I used to work with them, and sometimes they do, but only usually if you are working with them bare and doing things like putting on wire bonds to connect them to the outside world, or putting too much current or voltage through them. I once had to clear a 'gate' on one at 400x magnification with a human hair so we could carry on a test. After that I needed a coffee to recover as such concentration.

Hairyloon

Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.

Posted: Wed Sep 28, 16 7:50 am Post subject:

Nick wrote:

No, but as a relating engineer, it's almost always moving parts that let you down. A chip is simple for the owner. They don't tend to fail. Motors do.

Well there's a challenge: a chip that blows air without a motor... I think I'll pass.

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