Buoyancy device by phase change of water to ice

[Willy]

Buoyancy device by phase change of water to ice.

1.  A volume of water is frozen while at some great depth of water.
2. The water surrounding this ice is very near in temperature to the
freezing temperature of water.
3. The ice is contained within a highly temperature insulating vessel.
4. The insulating vessel has a neutral buoyancy in water.

What effect does water pressure have upon the freezing point of water ?
The freezing temperature of water remains nearly the same up to around
200 MPa or 29,007.5 PSI

1 foot of height of water in a column exerts 0.4335 psi

29,007.5 PSI divided by 0.4335 = 66914.6 feet or 20395.57 meters of depth
in water before there is a significant change in the freezing temperature of water.

The density of liquid water is 1 g/mL.
The density of ice is 0.92 g/mL
The ice is 8% less dense than the water.

Therefore, for every 1 Kilogram of water frozen at depth we get 8% of 1 Kilogram
of buoyancy in water.

1 kg = 9.80665 Newtons
9.80665 Newtons * 0.08 kilograms = 0.784532 newtons of buoyancy force for each
kilogram of ice.

0.7845 buoyancy joules per kilogram of ice at 1 meter of depth.

4.184 joules = 1 calorie.

It requires 4.184 joules to increase the temperature of 1 gram of water by 1 degree
centigrade.

It requires 4184 joules to raise 1 kilogram of water by 1 degree centigrade.

Below about 200 meters depth, ocean water has an average temperature of 4°C (39°F).

Given that we begin with water at a temperature of  1 degree centigrade.
Given that our refrigeration device is 100% efficient.

5333 meters is the break even point.

The average of the ocean's depth is 3,700 meters while the Challenger Deep is approximately 10.925 meters.

Not great, but possibly O.U.

[vineet_kiran]

I have done a similar experiment.  Fill a small steel jar with water upto 25%, close the lid and shake the jar up and down.  Nothing will happen.  But if you fill the jar (25%) with hot water giving out steam, close the lid and shake the jar up and down, the lid will fly off with high energy!   What would be the reason for it? 

[kolbacict]

Obviously pressure of steam.

The Air in the jar rapidly heats when the jar is shaken.  This is due to the
hot water mixing with the air.

Obviously,I was wrong.

[Willy]

Air expands when heated, it contracts when it is cooled down.

The Air in the jar rapidly heats when the jar is shaken.  This is due to the
hot water mixing with the air.

This is not the same thing as a phase change of water turning to ice @

https://overunity.com/19442/buoyancy-device-by-phase-change-of-water-to-ice/msg576521/#msg576521

[sm0ky2]

There is an associated change in volume of the insulated container,
What affect might this have on changes in temperature?
Begin freezing the water, and the effect causes an increase in temperature?
Theres also the weight of the refrigerator system, which will be much less buoyant than ice.
Causing a technical issue with the freezing.


It is an interesting concept, but i can see some issues that would first need to be addressed