Alt-BEAM Archive
Message #01659
To: zulu35@singnet.com.sg, beam@corp.sgi.com
From: Gadagada@aol.com
Date: Sun, 21 Mar 1999 13:16:05 EST
Subject: [alt-beam] Re: Heat to electricity device
In a message dated 99-03-21 12:13:12 EST, zulu35@singnet.com.sg writes:
<< just visited Beam-Online and i came across the link for a heat to
electricity device.. i wonder... does that meant.. take a photopopper for
example..
if we were to replace the photodiodes with thermistors and the solar cell
with these devices, would we get a bot that searches for the warmest heat
source ??
perhaps it could b similar to some bot i saw somewhere.. one thatgoes
towards candle flame and turns on a fan to blow it out.. could this b done
if we are to use the photopopper circuit? >>
Discussion pops up about these once in a while. They're called Peltier
devices and when electricity is applied to them, they pump heat from one of
their surfaces to the opposite surface. Conversly, they produce electricity
when their is a temp difference between the two surfaces. Sounds great right?
A heat eating robot. Unfortuneatly, the power to weight ratio of Peltier
devices is horrific. You'll never find one with enough power to drive a motor
which will move it anywhere.
Gary
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