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Thread: fire thermo fans ... do they work ?

  1. #16
    Member gadgetman's Avatar
    Join Date
    Jan 2012
    Quote Originally Posted by timattalon View Post
    Not quite. The fan would go on or near the mantle piece. The heat thingy would be attached to the big steel van thing that is part of the fire It is like the one in the link Woodsman Totara Insert Wood Burner | Woodsman Fires but has a big vane at 45degrees out the front to direct heat outwards. It gets too hot to touch so I would probably look to attach the thingy to that....
    You want the fan blowing over the heatsink on the cold side to help create the temperature difference to generate the power.
    specweapon likes this.
    There are only three types of people in this world. Those that can count, and those that can't!

  2. #17
    Member specweapon's Avatar
    Join Date
    Apr 2013
    I've made one, you need the fan blowing over the cold side heatsink so can't be remote mounted because the TEC works on temperature differential between sides. I used a 3v/5000rpm motor called a Mini 130 with a 12715 Pelitier and a 120mm plastic blade from a RC helicopter. I bought all the parts from Ebay for $8, apart from 2x old pc coolers.
    There are better Peltiers out there that could drive a stronger motor but I just went with the cheapest.
    It worked perfectly with starting up when the fire got warm and wasn't too fast at top speed. Took a bit of trial and error to get the configuration of the heatsinks correct, You want more of a solid block in the hot side but not so much that you cook the Thermocouple, I had too big a heat sink in early trials and the fan was cooling it
    Just don't expect it to work like a heat transfer system between rooms, more suited to mixing the air in a single room.

  3. #18
    Join Date
    Jul 2016
    We have one in our Duck Hunting Camp - An old woolshed - draughty as hell despite lining - It does move the heat around and even it up - Costs nothing but your purchase price - would certainly get another - personally reckon they are best in a square or rectangular room doesn't seem to push heat around corners so well - Hope this helps



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