On Mon, 19 Nov 2018 20:26:03 +0000, T i m wrote:

On Sun, 18 Nov 2018 16:38:34 +0000, Chris Hogg wrote:

snip

Capacity factors down to about 4% in winter, so next to bugger all
actually.


We have one of those solar powered PIR lights on the front (South
facing) wall. During the summer it works quite well, often giving
quite a lot of light many times through the night as people walk past.

Tonight, it's just stuck on a low glimmer so useless. ;-(

I think it takes std AA sized cells and currently has what are
probably not particularly good quality / capacity. I might try
swapping them out for some Eneloop or just higher capacity NiMh's in
the hope that might buy me some time between sunny spells.

I don't think it will help though as whilst there has been quite a bit
of sun over the last few days, it doesn't seem to have any power, as
noted by a complete lack of movement in my Crookes radiometer (in a
South facing window).

Cheers, T i m

On a slightly different theme, have you seen these stove top "fans".
They are presumably a peltier generator and indeed look impressive
when operating.

One pub I used to frequent had one. I do not think it had much value
as far as circulating air went though. As these things cost over £60,
I wonder if they may be the next item on the list after the PPI
claimlines have been pensioned off :-)

AB

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On 21/11/2018 07:15, Chris Hogg wrote:
On Tue, 20 Nov 2018 23:47:20 +0000, Archibald Tarquin Blenkinsopp
wrote:


On a slightly different theme, have you seen these stove top "fans".
They are presumably a peltier generator and indeed look impressive
when operating.

One pub I used to frequent had one. I do not think it had much value
as far as circulating air went though. As these things cost over £60,
I wonder if they may be the next item on the list after the PPI
claimlines have been pensioned off :-)

AB

A Stirling engine again. See
https://www.stirlingengine.co.uk/d.a...VULCANSTOVEFAN

silly idea anyway.

hot air rises...cold air is drawn to the fire..the hot air cools a
little and comes down furthest from te fire.
Natural circulation...


--
Theres a mighty big difference between good, sound reasons and reasons
that sound good.

Burton Hillis (William Vaughn, American columnist)

On Wed, 21 Nov 2018 07:15:33 +0000, Chris Hogg wrote:

On Tue, 20 Nov 2018 23:47:20 +0000, Archibald Tarquin Blenkinsopp
wrote:


On a slightly different theme, have you seen these stove top "fans".
They are presumably a peltier generator and indeed look impressive
when operating.

One pub I used to frequent had one. I do not think it had much value
as far as circulating air went though. As these things cost over £60,
I wonder if they may be the next item on the list after the PPI
claimlines have been pensioned off :-)

AB

A Stirling engine again. See
https://www.stirlingengine.co.uk/d.a...VULCANSTOVEFAN

Thanks, I honestly thought it was a few of those peltier slabs on the
base though.

Interesting but the pub has closed now so I cannot investigate futher.

Simple but in all honesty the Stirling engine does not seem too
intuitive in operation, it gives a route for a bit of research as to
its beginnings though.

I do get the impression that the fan would be fairly useless in most
situations though, unless of course there was a small hole in the rook
directly above the stove.

I suppose the net gain would be zero, unless the thing had a squeaky
bearing and some acoustic energy was lost to the exterior?


AB





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