Re: Ice depth, ice caps and icebergs

mirage wrote:
Yves Quemener wrote:
Are there places where the air at -30° Celsius and the liquid water at
0° are separated by only a few meters of ice ? Wouldn't it be possible
to extract energy for this temperature gradient, just as in the "Ocean
thermal energy conversion" ? why not ?

Perhaps if you think about a slightly different example you can answer
your own question. Imaging a ship floating in 0 degree water, with 30
degree air (plus/minus doesn't matter) all around. How would the ship
exploit the temperature difference to propel itself?

--mirage


I would fill a pipe circuit with a gas in the correct pressure condition so that its boiling point would be between 30°C and 0°C and use the gas circulation to move a propeller.

Maybe just any gas could be used, as they tend to dilate themselves when heated, so even without vaporization, a circulation could be generated.

In the case of a 0° water and 30° air, maybe I could also use a metallic weighted propeller, half in water and half in the air and use the simple fact that the metal dilates to generate a higher torque with emerged arms and thus would make the axis turn.

I don't have problem to see how the thing could work, I am trying to find a difficulty or an impossibility with it...

Yves
.

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