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Paul Alciatore
12-12-2016, 08:33 PM
Interesting idea:

http://machinedesign.com/materials/thermoelectric-paint-could-convert-more-waste-heat-electricity?NL=MACD-001&Issue=MACD-001_20161212_MACD-001_599&sfvc4enews=42&cl=article_2_b&utm_rid=CPG05000002086619&utm_campaign=8895&utm_medium=email&elq2=3f7eef928d5b4970a52cc70ed80aadc6

They are painting on alternate P type and N type coatings on a surface that sees temperature gradients and getting electric power out. About 4 mW per sq cm or 1/40 Watt per sq in.

It's in the lab stage but I wonder what it costs.

A.K. Boomer
12-12-2016, 09:02 PM
perfect solution for certain cooling fan operations where there is not already a rotating motor involved, connected to a high efficiency fan motor, components start to warm up - fan comes on in various stages according to heat generated... sounds good on paper anyways...

like in PC's we just talked about - one of the bennies would be less dust collection --- when the machine is not putting out the fan is either off or barely moving...

kendall
12-12-2016, 09:58 PM
Be interesting to see what kind of heat range it would handle.Can think of a few good uses for it even if it does have a narrow working range.

Lew Hartswick
12-13-2016, 07:22 AM
The problem with all these "Heat" power generating schemes is, It's not just heat but the Temperature DIFFERENCE between the hot and cold junctions
that "do the trick". SO how do you get the cold junction to not just heat up by the conduction through the junction?
...lew...

A.K. Boomer
12-13-2016, 08:08 AM
The problem with all these "Heat" power generating schemes is, It's not just heat but the Temperature DIFFERENCE between the hot and cold junctions
that "do the trick". SO how do you get the cold junction to not just heat up by the conduction through the junction?
...lew...

They are the Sterling engine of the electrical paint world,,, so maybe part of the plan is to power a fan with it that's directed more at the cold junction, same with what you do for the cold side of the sterling engine...

6PTsocket
12-13-2016, 09:01 AM
These seem to be related to those solid state refrigeration panels that are seen in coolers. You run current through the panel and one side gets hot and the other side gets cold. The cold side faces into the box. To get any efficency the hot side has to be air cooled with a fan or water cooled. In boat refrigerators, a small pump just circulates sea water. I know this is not exactly the same thing. Tbermocouples used for temperature measurement are exactly the same thing. Two different metal wires are spot welded together and a voltage appears across the wires that is proportional to the temperature

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Lew Hartswick
12-13-2016, 03:04 PM
They are the Sterling engine of the electrical paint world,,, so maybe part of the plan is to power a fan with it that's directed more at the cold junction, same with what you do for the cold side of the sterling engine...
Boomer, maybe this is an attempt to do the perpetual motion deal. :-) Use part of the electricity to run a fan to cool the "cold" jct. and some of it to heat the "hot" jct. and as the Brits say. Bobs Your Uncle. :-)
...lew...

A.K. Boomer
12-13-2016, 03:19 PM
For a second i thought we were both gonna be rich! :p

but no such luck heat variance engines or electrical producing paint don't fall into the perpetual motion deal, unless they can produce enough heat variance within themselves to keep going - which they can't - so looks like were both going to get a lump of coal for X-mas again Lew :-( look on the bright side - least we get to keep warm, back to the drawing board.