Re: Stove fans

Nick Alexander wrote:

"The Peltier effect...
In physics, a change in temperature at the junction of two different metals is produced when an electric current flows through them. The extent of the change depends on what the conducting metals are, and the nature of change (rise or fall in temperature) depends on the direction of current flow. It is the reverse of the Seebeck effect. It is named after the French physicist Jean Charles Peltier (1785-1845) who discovered it in 1834."

FASCINATING, but does it work better than a small 12v fan ...ie more efficiently....God bless academia...time will tell...


The Seebeck pile consists of about 120 little pieces of doped silicon, soldered together in a stack. The motor on the smaller Ecofan is rated at 1.5-4.5V so I suspect that's what's being produced at full whack, though when I measured the motor's characteristsics with the fan on, it was drawing about 350mA at 4V, so it may never get up to full speed.

I know all this because Burland's Ecofan died recently after about 4 years' use. I hoped it was the motor, but it seems to be the Seebeck stack, probably one of those 240-odd soldered joints cracked, as it works intermittently. I don't know where to get a new one- Peltier coolers are easily available, but they won't be made using high- temperature solder, as they assume the hot end is kept to about 50 degrees.

Paul Burke
.

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