Consider a problem where a tank holds compressed natural gas, compressed to approx. 250 times atmospheric conditions.(adsbygoogle = window.adsbygoogle || []).push({});

Now release the tank valve letting some of the gas out.

Assuming a small timestep, I can approximate the energy lost as 1/2 mv^2,

where m is the mass released during the timestep, and v is the (assumed constant for small timestep) velocity of exiting gas.

Can I equate this to the change in stored energy in the tank during this timestep with reasonable accuracy?

If so, can I model the stored energy as E = PV

where P is pressure in the tank and V is the volume.

Thanks alot.

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# Stored Energy in a pressure vessel

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