Dear Dingus Mungus,

If you are impatient, please look at slides 21 to 30 in
http://www.energyfromair.com/DraftEPlan5a.files/frame.htm
first.

The diagrams show how simple the experiment was.

We did the following:
(1) With no water tank, no one-way valves, check whether air comes out at the higher level using a piece of tissue paper to see air movement.  Inother words, we just pump air via a long tube (300 meters). The result was obvious.  Air came out no matter the height.
(2) In (1) use a thermometer to check the temperature at ground level and at the greater height.  There were no significant differences.
(3) With the Beach Pump acting as a water pump, we could only pump water up to about 3 meters.  The water column pressure would be too strong for the human hand.
See the above website diagrams.
(4) With the Beach Pump acting as air pump and the use of one way valves, the water was delivered to 5 floors - over 15 meters.
(5) Similar experiments were repeated in multiple sites in China.  You are encouraged to replicate it worldwide.

Two beach pumps were used to smooth out the delivery.  If we use a single beach pump and pause between pumping, the air+water fluid column will separate into very distinct two sections within the one-way valves.  One is air and one is water.  The pressure required to move such a two section fluid is much higher than the air+water column. (This drawback makes it impractical to implement the above as the commercial device.)

I hope the slides will help you to purchase similar beach pumps, one-way valves (We bought extra beach pumps and took out their one-way valves), Plastic box acting as water tank, T-junction tubes, plastic tubes etc.  The beach pumps costed USD2 each.

The entire set up to pump to 5 floors should be less than USD100.  You and some other forum members should be able to replicate this experiment.

Mr. Cheung Pat Lung who helped us to set up the demonstration in December 2004 spent USD40 to buy a one-tenth HP pump so that a smooth operation can be shown in front of the News Media.  (in addition to the hand pumping as illustrated.)  

If I remember correctly, the tank of water could be delivered to 4 floors in approximately 7 minutes.  You should do the actual experiments to check.

Hello ltseung:
   I am really stepping out on a thin limb here but I would like to pass on this idea. I have read and watched the experiments concerning airiated water. If you have a bouyant device sitting in the water and then mix air bubbles with it the device will sink, and very rapidly I might add.
   Now you take that same water in a dish and fill it right to the top and just a bit more, you guessed it, surface tension tries to hold it. All thoes bubbles have surface tension to them. They will want to rise due to the pressure but by doing so it will also try to carry the water with it. Result is the water will weigh in a lot less. Nature fighting nature so to speak. That is sort of my guess at what is going on here. I am very impress with your ideas. I would be interested in playing with this.
   
   May I have your permission to make a small replica here and see what transpires? 

Sugra.   Many thanks for your time.

Am i missing something here?

we've been using nitrogen for refrigeration since your grandparents generation.

For the sake of discussion, lets keep Temperature and Pressure seperate. Though the two are proportional, they hold 2 seperate energy values in this set-up.

The energy you put into the pump to compress the nitrogen (Pressure) is exactly what you get out.
 -- minus heat/friction loss, ect.

The drop in Temperature (Energy Potential) when expanding nitrogen is MUCH greater than the heat loss. This is a well known, and well exploited phenomenon. 

converting this difference in temperature into useful work is done in every nitrogen-refrigerant system on earth.