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#1
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Flow rate / remaining pressure
Assume a 6.6CF tank that receives an additional 59.4CF of air every one-second cycle. Within eight cycles the pressure would reach 1022psi and within sixteen cycles 2033psi. The tank is equipped with a safety valve set for 3,000psi. If I begin releasing air after the 16th cycle, how can I calculate the flow rate given that 1) I don't want the pressure to go above that 3,000psi threshold and 2) the tank is constantly being refreshed at that rate of 59.4CF/sec.?
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#2
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Re: Flow rate / remaining pressure
If you don't want to keep increasing the tank pressure indefinitely, the outgoing flow rate obviously has to be the same as or greater than the incoming flow rate.
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#3
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Re: Flow rate / remaining pressure
Do you want a constantly increasing outgoing flow rate to equalize with maximum pressure or a constant one that in a certain number of cycles won't let the pressure breach 3,000 psi?
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#4
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Re: Flow rate / remaining pressure
Quote:
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#5
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Re: Flow rate / remaining pressure
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#6
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Re: Flow rate / remaining pressure
Quote:
At any rate, you want the mass flow at the inlet and exit to be the same. Mass flow is a function of density, velocity and the area at the inlet / exit. Continuity equation: rho1V1A1 = rho2V2A2 rho1 = density at inlet V1 = velocity at inlet A1 = area at inlet rho2 = pressure at exit V2 = velocity at exit A2 = area at exit Also, you probably want the ideal gas law to convert for density: PV = NRT P = pressure V = volume N = moles R = gas constant - 8.314 (kpa*m^3)/(kmol*K) T = temperature There are a few websites that can explain the theory. Try www.engineeringtoolbox.com. If I were you I would worry more about the mechanical energy needed to maintain your assumed constant flow at high pressure. -Jake Last edited by Zotas : 11-02-2004 at 14:44. |
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