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Strategies & Market Trends : Ride the Tiger with CD
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To: Gib Bogle who wrote (173641)8/30/2009 3:12:45 PM
From: E. Charters  Read Replies (1) of 313059
 
Well, the idea of heat refrigerators is nothing new. You can get propane fridge etc.. Evaporation of ammonia.

It is tricky what they use the heat for.

Once the ammonia liquid is added to a closed vessel containing hydrogen, it evaporates and its pressure drops since it is now a mixed gas, but since only a fraction of the gas in the vessel, ammonia's pressure is now equal to its fraction of the total molar weight of the two gases or partial pressure of the mixed gases, even though the total system pressure did not change. If it were ammonia alone, the pressure would be too high, as at that temperature more ammonia would evaporate to reach system pressure. It thus may evaporate at a lower temperature than freezing and draw heat from an area. It is then pumped into water where it dissolves. The water is heated and the ammonia is driven out of the water as a gas again, and condensed to start the cycle again.

You would think that with two mixed gases the pressure of each gas would equal the system pressure. But they don't. Each gas contributes a portion of the pressure according to its molar volume. Thus chemically, by state, the ammonia reacts as if it were by itself in a chamber of equal dimension. Dalton's law. The reason for the hydrogen is to take up space so the ammonia does not reach too high a pressure and heat.

EC<:-}
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