Water-air composite pressure system

AI Thread Summary
The discussion revolves around calculating energy in a water-air composite pressure system with three different setups: an air tank at 10 bar, a water tank with a height of 1 meter, and a combined system of water and air. The poster calculates energy values for each system, concluding that the total energy in the composite system is 50,900 KJ, considering both water and air contributions. The main question raised is whether these calculations are correct, particularly regarding the significant difference in energy values between the systems. The poster seeks clarification from those knowledgeable in hydraulics to address potential errors in their reasoning. The inquiry highlights the complexities in energy calculations within composite pressure systems.
apurvmj
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Hi all,
This is my first post since I'm unable to find the answer myself & on the net too.
My query is let's consider we have 3 types of system

1. Air tank at 10 bar pressure.
It will have105*10*1= 1000 KJ energy.

2. Water tank of volume 1 cum and height of 1 m.
It will have 5.04*h2 = 5.04 KJ (h= water head pressure)

3. Now let's say we have 2 cum of volume containing water of 1 cum and 1 cum air at 10 bar.
can I say we have energy in water= 5.01*1002 = 50400 KJ (10 bar=100 m of water)
plus when water is out of tank volume of air will be 2 cum at 5 bar.
then energy stored in air (considering isothermal expansion)= 500 KJ
so total 50900 KJ.

Am I doing wrong some where/ everywhere then where is it wrong?
If not why there is so diffrence in energy?
 
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Pls help.
Don't anyone here study hydraulics.
 

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