I just ripped it off the net. It is just the limiting Carnott efficiency
1-t/T like.
Yes there are small Stirlings that can convert down in the sub 100C range
fairly efficiently,
but with them you would have to go heat>mechanical >electrical> control you
cell. Peltiers give you direct heat > electrical but you are lucky to get 5%
in the real world on those and that would mean a COP of 20 for a self
sustaining thing.
You also can get heat mechanical via things like NITINOL wire systems and Minto
wheels at fairly low temps.
[my target for NI is 2 to 3:1 but not self sustaining, I doubt it will be
convincing to outsiders- just a start. I do have one sample though that I
might can get self heating enough to do mechanical work with a toy Stirling.
But, as usual, not at levels to be free from fraud attacks]
Jed- do you know who/what is the demo listed for ICCF Monday evening?
D2
Date: Tue, 4 Jun 2013 10:51:00 -0400
Subject: Re: [Vo]:A Couple Hundred Bucks Maybe...
From: jedrothw...@gmail.com
To: vortex-l@eskimo.com
DJ Cravens <djcrav...@hotmail.com> wrote:
must be connected to the mains------bingo- if your process requires electrical
input you must have a high COP.
Where did that graph come from? Did you make it?
I have never heard of mechanical work from temperatures below 100 deg C.
By the way, I wrote: "These [low temperature] devices would reduce electric
power consumption by a large margin, and eliminate the use of natural gas for
everything but cooking." I meant in household (domestic) applications.
These would have to be driven with mains electricity. Or perhaps with a Hot Cat
power generator.
Energy applications are often divided into domestic, commercial, industrial and
transportation sectors.
- Jed
