Posted by hoopy on April 21, 2006, 1:28 pm
I remember watching a tv show on extreme homes awhile ago. The house
in question was off the grid and the homeowner had rigged his own
refrigerator with some sort of solid state chip that when
powered...cooled on one side and heated on the other.
I'm fairly electronic deficient so could someone explain to me in
laymans terms what kind of "chip" is was and how it works?
Posted by Kent Hoult on April 21, 2006, 1:48 pm
That would be a Peltier chip.
Here is a decent writeup on how it works:
You find quite a few these days used in mini-coolers for cars that run off 12
Their main feature is that they let you make a small cooler. But their
efficiency is much
worse than a typical compressor based cooler.
Posted by Ecnerwal on April 21, 2006, 3:07 pm
Pelter Thermoelectric cooler. Said homeowner would be in the "not too
swift" category, as they are not very efficient, and thus a waste of
power in an off-grid house. But smart people make bad TV, I guess.
Cats, coffee, chocolate...vices to live by
Posted by danny burstein on April 21, 2006, 4:30 pm
[ snip ]
While they're less efficient, they do have some advantages
that might make up for it.
First, they're _silent_.
Second, they're pretty tolerant of voltage shifts
third, there's no startup surge demand
and finally.... if you design a refrigerator from
scratch, you can make it a well insulated _top load_,
"chest type" unit. This is much, much, more efficient
than a front door type, and significantly reduces
the amount of cooling you need to keep tings stable.
Building the cooling system for a homebrew is much
easier with a Peltier than with Freon tubes and compressors.
Note that you _won't_ have any "reserve cooling" capacity,
so if you put something warm in it, it's going to take
quite awhile to cool off.
Knowledge may be power, but communications is the key
[to foil spammers, my address has been double rot-13 encoded]
Posted by Benedict White on April 21, 2006, 4:45 pm
If you were going to use a mechanical system why use freon? (And
presumably a rankin cycle) when you can use air and a stirling cycle
driven by all sorts of means.
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