Stove Fan

[Steven P]

Good morning,

I think I have burnt out my stove fan, too hot and it breaks the "TEG" (electrical thing), it looks a simple fix, unscrew it all, bung in a new one and put it all back together. 

 

Has anyone done this before and any recommendations as to power output and so on?

 

Looking at the online things, there is all sorts out there, different volts and power outputs, I think I know which one to get but just in case I had missed something

 

As a side comment, while I was looking there was a 100W module, water cooled, which you could fasten to the side of the stove, 2 of them and I think in the winter that would nearly do the hot water without any plumbing (12 hours heating, 2.4kwh, I think I use 3 for hot water), just a couple of wires and a new heater in the water tank. Going to think where to put a cold water sump now.

[openspaceman]

1 hour ago, Steven P said:

Looking at the online things, there is all sorts out there, different volts and power outputs, I think I know which one to get but just in case I had missed something

You'll need to check the voltage of the motor, also there should be some numbers on the little Peltier device, the little square thing clamped between two plates. If not see how the fan spins with just a single AAA cell on the two wires attached to the motor.

1 hour ago, Steven P said:

 

As a side comment, while I was looking there was a 100W module, water cooled, which you could fasten to the side of the stove, 2 of them and I think in the winter that would nearly do the hot water without any plumbing (12 hours heating, 2.4kwh, I think I use 3 for hot water), just a couple of wires and a new heater in the water tank. Going to think where to put a cold water sump now.

Have you a link? I think you are being very over optimistic. Come over to the off grid thread and discuss. TEGs produce up to 4% electricity of all the heat that passes through them from one side to the other. That's with the hot side at 300C (if the solder will stand it else only 300C) and the cool side at about 25C. as the cool side warms up the output goes down. So you would need to poke about 2000W through a module to get 100W electricity out but all the heat would have to be removed at 25C so not hot enough for DHW if you maximise electricity out.

[peatff]

You could buy a new fan from Aldi for about £12, they had some in ours last week.

[Steven P]

Bit slow to reply here....

 

Yes, the high power system , a US website, and that's what they claim. Practicality for me would be to put a sump under the floor which rarely gets above 8 deg C in the winter, however another practicality is I need to save £1k to buy the thing and justify 6 months of hot water of the stove when like everything there could be better things to do with the cash.... another layer of insulation might save the hot water electricity by buying less fuel. Anyway, here it is

 

The Aldi fan, I am sure our Lidl had one over Christmas but not at the weekend - they do have chainsaws, and hedge trimmers to distract me at the moment though.

 

Noticing this week how much difference not having the fan makes to the living room, tempted to put the other fire on to draw some air about the house and some heat away from right in front of the fire

 

 

WWW.TEGMART.COM

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[Steven P]

On 10/01/2022 at 12:04, peatff said:

You could buy a new fan from Aldi for about £12, they had some in ours last week.

Cheer's £17 from Aldi - the last one in the shop and cheaper than buying the TEG generator from somewhere like RS (though Chinesium from ebay is cheaper.. but unsure of the quality, some is great.... some not so great).

 

Now I have a spare fan assembly to experiment with as I want to later in the year (thinking to add a PC heat sink above the TEG, then the cooling fins and an uprated TEG (5V-ish, lots of Watts), see what it can do (thinking to the water cooling idea..... see if I can drive a small water pump with that first)