Hi Bill,
As Lonner said, the price will be the killer, we used these in some applications when I worked in a wafer fab. I have not checked prices after 2000 but they were high back then.
Ron
--- In electricboats@yahoogroups.com, William Grace <jwsys@...> wrote:
>
> Hi Ron
>
> Your concept of using the wasted heat from anywhere has got me thinking.
>
> If I remember my physics correctly, pairs of thermocouples can provide
> this result. Solid state chiller boxes use this principle in reverse
> (refrigerators without compressors). These thermocouples consist of
> dis-similar metals connected electrically, and are used in pairs. In
> the chiller set up, one of the thermocouple joints is inside the box
> whilst the other is outside. The thermocouples are connected in
> series and are then connected to a battery of suitable voltage. The
> current flowing through the series system causes the joint temperature
> to change, one becoming hotter, the other colder. Most of the simple
> chiller boxes have a 'heat' option which is derived by reversing the
> connections. Theoretically, it is possible to reverse the process
> so that a current is produced when the thermocouples are held at
> different temperatures. One could be under a solar panel whilst the
> other half of the pair could be attached to a skin fitting which would
> hold it at water temperature. The parts could be obtained by
> disassembling a chiller box. Usually the thermocouples are attached
> to heat sinks, one being placed inside the box with the other outside.
>
> I have not tried this but expect it would work although the current
> generated would be of a similar order to that used to run the chiller.
>
> Bill Grace
> NZ
>
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