OT [sdiy] Peltier Elements

[harrybissell]

HAH !!! (LOL)

well that makes a lot more sense.  They did say "stove" on the
package...
and silly me, since they were sold at the "GOOD FOOD STORE"
(a healthy supermarket)... I assumed they were for COOKING with, since
they were stocked with the juicers, slicers, dicers, etc...

What you say makes sense... especially since the WOOD fire would
(teehee) have lots of waste heat anyway.

Might work even better if they designed one end to go into the flue
pipe....

I wondered how that tiny DC motor would take the heat (obviously plastic
is not
too good)

I'll run out and buy two, to replace the two gorgeous, scantily-clad
concubines who normally
fan me with those big feather fans...

second thought... maybe I won't  :^P

(Thanks for the heads-up Doug :^)

H^) harry

The Peasant wrote:

> Quoting harrybissell at prodigy.net:
>
> > Not directly related... but i saw the most ridiculous
> > product yesterday. It as called eco-fan (or similar
> > iirc)...
> > it was a fan with an aluminum extruded heatsink... for
> > use inside
> > a cooking oven. The fins were arranged so that the cool
> > side
> > of the peltier device was "cooler" than the hot side, it
> > worked
> > on temperature differential from top to bottom. The
> > Peltier device drove a small electric motor.
>
> LOL! Harry, somebody here is just a bit confused. The
> device that you refer to is NOT for use *inside* the oven,
> it is designed to be used on top of woodstoves to circulate
> the heat coming off of the top. If you read the
> instructions on the box carefully you will find this.
>
> It does generate it's own electricity, from the heat
> difference between the stove top and the air above, using a
> peltier chip. That's right, you can generate power with a
> peltier, its just a 4 quadrant heat pump - in-out/up-down,
> it's all the same. This device is very environmentally
> friendly, as it runs off of a stove that would be burning
> just as much fuel anyways, but it really makes a big
> difference if you rely on wood heat and don't have ac
> power. So Ecofan is an appropriate name.
>
> The only problem is that peltiers are soldered together
> with fairly low temp solder, so it's very easy to damage
> them with excessive heat. The Ecofan has a bimetallic strip
> in the base that lifts the device off of the stovetop a bit
> when it gets too hot, but even then, it's not very hard to
> damage them if you are not careful. There are manufacturers
> who make higher temperature peltiers specifically for
> thermal power generation, but they are very expensive.
>
> *****DISCLAIMER*****
> I don't sell Ecofans or have anything to do with them, I
> have just used the product myself and think that it's a
> great idea. I also spend significant amounts of time in
> wood heated dwellings without mains power in a cold climate
> and have experimented with heat to power conversion and
> other alternative energy sources. YMMV.
> *****DISCLAIMER*****
>
> Take care,
> Doug
> ______________________
> The Electronic Peasant
>
> www.electronicpeasant.com