Jim Riley

What?

The problem is, no one has given a satisfactory answer. Comparing the wattage of the fire, yes 4kw, has no relationship with the wattage needed to drive the fan. Other than the hotter the fire, of whatever kw, the faster the fan, until the bimetal strip lifts it and cools it down.

It' It's both. I think it travels through the peltier cell, this creating electrickery, sending the heat the other way cools the peltier cell , as in car cool boxes. Of course conservation of energy means that some becomes electrickery, some is dissipated by the fins. But not zero. Therefore correct. Pedantically speaking. IMHO.

Yes, but repeating something doesn't make it right. Heat travels up the mass of the fan by conduction, some of it radiates away, some of it conducts into the air, this is of course assisted by the fan causing a greater air flow over the fins.

Ooh, mr picky pedant. I put it simply for the hard of learning. I know the heat travels up the mass of the fan by conduction, it then leaves the fan body by radiation and conduction into the air. But we do put the fan on to the stove to remove heat from it that would otherwise be pushed up the chimney by the surrounding air pressure of roughly one atmosphere. This theory is demonstrated in this thread, I'm low down and grounded, being Cool, while others are way above me, being full of hot air. Did you post something earlier, I must have missed it. Try shouting in bold capital letters. ;-)

But that's not what he said is it. He didn't say nothing happens when it's going slowly, that's your surmise.

I do not need to experiment, I'm happy. And you really backed up what I was thinking, there is a formula for such things, not just "I think" and "probably".

Dear anyone know how to calculate how much fluid a propellor moves, at a given speed, size and pitch? This would tell us how much air an ecofan can shift. Any engineers got a book of tables?

The air above the stove is moving faster than by convection. It's moving horizontally. Away from the stove. Taking the heat with it. So cool air is constantly being drawn in to replace it. That is then warmed and blown away. Constantly but slowly. Cooling the stove. So the kettle doesn't boil. By your reckoning the effect of a static fan on the kettle would be the same as the moving fan. This is not the case. Kettle boils. Btw an insignificant force, applied continuously, can move mountains. A little drip in same place, wears a big hole. At least you now agree there is some effect, that there is a force.

I know all about the infidels, but thats no reason not to poke them with the stick of truth. Hopefully you will get a bigger stick, if not a battering ram. Even then, I suspect some are too far gone to admit even the tiniest of benefits.

OMG! My stove has gone molten. I've fed it too much Jet and other joules. they've built up in the metal.

Probably? Probably pigs can fly. Any fule kno that air moving across a surface increases the exchange of heat, into or from that surface, depending on the temperature difference between the two. And you've avoided the question, where have the joules gone?

No doubting engineer has answered my evidence, they've ignored the because it doesn't suit their world view. With ecofan on stove kettle won't boil, without ecofan it will. So the fan is taking heat from the stove that would otherwise go up the chimney or heat the kettle. Who has robbed the joules otherwise, where have they gone??Also a static thermometer wouldn't demonstrate that there is a more even distribution of heat around a room, test the effect in the cold spots.

Thanks lads. I'm curious that those who claim to be engineers can't see the obvious benefits. As for the aforementioned second greenie, yes, it's loaded, tongue rolled, ready to aim. I was good at spitting as a lad, one of the benefits of a bad chest, smoke from t'mills, tha'nows.

Mine cost me £90 10 years ago, still whizzing away from 9am to 10pm ish, November to March, so maybe less than 10p a day and dropping, for the capital outlay. No running cost, gain in spreading heat round the house instead of it warming the clouds. No brainer really. It's pulling way more than 10p worth of calories off the stove over a day, and chucking them slowly across the room. The gas and leccy boards keep coming to check or swap the meters, because our usage in winter is lower than summer. They think we are cheating. Water for leccy kettle is pre warmed with a large kettle on stove, if it's not boiling. Provides water for washing up and for us washing at night. No gas heating. In summer we will put it on for a little while if we are chilled. (Which I am of course, especially about the effectiveness of ecofans!)

Not necessary, the heat differential is enough to get plenty of revs. The blade is a blur. I tried a 1" X 6" bit of kitchen towel in front of the blade. Up close the strip rose to about 35/40 Deg. It dropped slowly and was still affected over 24" away. Of course some will claim the air currents just stop dead at that point, but an even temperature around the room shows this is not so. It keeps moving slowly.

I'll sneak up in stealth mode, ultra quiet, put stove on back deck, with small mast and sail, square rigged, point fan at sail. You won't know I've been till your socks go damp.

Oh no! I'll get banned by Teach! Then where will I go for intelligent boaty talk, where I can accuse someone of being a Trump with impunity?

Of course, but in your case the heat is stored within the mass of the 2kg weight, which, once up to temperature, stops absorbing any more. Where is the same heat going when absorbed by the .5kg mass of the ecofan? I await your alternative facts.

It's all posted with a big smile, I can assure you. The faux seriousness gets the usual suspects scurrying, squeaking twaddle! But still not had a genuine reply on my proposition. Can't cope with the truth, you friends of Trump!

Whenever I have posted a rational argument the doubters just waffle on. There's none so blind....... At last a constructive debate, mostly! So, with kettle on stove and ecofan on stove, the kettle just about simmers. Without ecofan, kettle boils. Has a burglar robbed the joules? Where has the heat gone if ecofan doesn't work.

One that carries plumbers?

Haha! Room for both. In a recent poll, in a place inhabited by more intelligent posters, 84% of voters thought that they worked.

I was wearing my pretty usherrette's outfit when I posted. However my stove won't boil a kettle with the ecofan on, take the ecofan off the water boils. Also, the room it's in has cold spots near the window,, in corners etc with no fan, even temperature with, and the heat spreads to other rooms with doors left open. Doubters explain the difference please, scientifically, non of your emotional twaddle you trot out every time, the questions I've posted have never been answered. Who has robbed the joules?

An ecofan is your friend.