Fan Driven by Heat: I bought one of these years ago for my wood stove. I don't understand how heat makes it spin. The hotter the stove gets, the faster it spins. How does it work?

jerryc41 Loc: Catskill Mts of NY

I bought one of these years ago for my wood stove. I don't understand how heat makes it spin. The hotter the stove gets, the faster it spins. How does it work?

Amazon doesn't offer an explanation.

Jimmy T Loc: Virginia

jerryc41 wrote:

I bought one of these years ago for my wood stove. I don't understand how heat makes it spin. The hotter the stove gets, the faster it spins. How does it work?

Amazon doesn't offer an explanation.

Free energy!?!

jerryc41 Loc: Catskill Mts of NY

Jimmy T wrote:

Free energy!?!

Well, I did have to buy the wood.

BebuLamar

It has a thermal electric generator. It generates electricity by heat.
https://en.wikipedia.org/wiki/Thermoelectric_generator

jerryc41 Loc: Catskill Mts of NY

BebuLamar wrote:

It has a thermal electric generator. It generates electricity by heat.
https://en.wikipedia.org/wiki/Thermoelectric_generator

Thanks.

sippyjug104 Loc: Missouri

It is driven by the pressure differential created by the difference in density between the air warmed by the radiating flue vs the cooler air of the room. Nature abhors a vacuum so pressure moves from the greater to the lesser passing through the fan causing it to turn...and turn...and turn.

marine73 Loc: Modesto California

sippyjug104 wrote:

It is driven by the pressure differential created by the difference in density between the air warmed by the radiating flue vs the cooler air of the room. Nature abhors a vacuum so pressure moves from the greater to the lesser passing through the fan causing it to turn...and turn...and turn.

And the more heat the faster it turns

jerryc41 Loc: Catskill Mts of NY

sippyjug104 wrote:

It is driven by the pressure differential created by the difference in density between the air warmed by the radiating flue vs the cooler air of the room. Nature abhors a vacuum so pressure moves from the greater to the lesser passing through the fan causing it to turn...and turn...and turn.

It's not at all like the one below.

srg

jerryc41 wrote:

I bought one of these years ago for my wood stove. I don't understand how heat makes it spin. The hotter the stove gets, the faster it spins. How does it work?

Amazon doesn't offer an explanation.

Hot air rises.

Harry02 Loc: Gardena, CA

jerryc41 wrote:

I bought one of these years ago for my wood stove. I don't understand how heat makes it spin. The hotter the stove gets, the faster it spins. How does it work?

Amazon doesn't offer an explanation.

Look up Sterling engines, Quite interesting.
My grandmother had a fan that worked off a candle.

Harry02 Loc: Gardena, CA

jerryc41 wrote:

It's not at all like the one below.

I had a collection of them for the holidays. Sis "borrowed" them- then "lent" them

alawry Loc: Timaru New Zealand

It's not a "hot air rises" thing nor a stirling cycle. They use a thermo power cell which generates electricity from two sides of the cell having different temperature. so the fan unit has a base to contact the stove top, and a finned component to disperse the heat from it's top. It's still very hot but cooler than the base. this generates electricity which drives the fan.

https://www.aliexpress.com/item/1005006085189362.html?spm=a2g0o.productlist.main.89.464b20aeihKJxy&algo_pvid=17a34b32-4e07-40e6-a964-d22a029d7d4d&aem_p4p_detail=202312140257171173015198104650000036144&algo_exp_id=17a34b32-4e07-40e6-a964-d22a029d7d4d-44&pdp_npi=4%40dis%21NZD%2123.94%2113.13%21%21%2114.59%21%21%402103246617025514376472087eef6b%2112000035660799416%21sea%21NZ%210%21AB&curPageLogUid=QHHXsURjoPBx&search_p4p_id=202312140257171173015198104650000036144_9

tcthome Loc: NJ

jerryc41 wrote:

I bought one of these years ago for my wood stove. I don't understand how heat makes it spin. The hotter the stove gets, the faster it spins. How does it work?

Amazon doesn't offer an explanation.

Like different air & water temps creates wind. They have roof fans (here in the US too) that are shaped like the cones (think ice cream cone shaped above the waffle shape) like many of the pointy type (?spires) in the middle east that spin from temp differences that pull the hot air out of buildings without electric.

alawry Loc: Timaru New Zealand

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alawry Loc: Timaru New Zealand

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