Gas Bladder Tank/Capacitance
Gas Bladder Tank/Capacitance
(OP)
Wanted to check a formula. I've got a gas bladder accumulator and I'm trying to verify how to determin the fluid capacitance of the tank. I've been using Po/(Vo*gamma), Po=Precharge Pressure, Vo=Volume at precharge, gamma = cp/cv (ratio of specific heats).
Could anybody tell me if this is correct?
Could anybody tell me if this is correct?
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RE: Gas Bladder Tank/Capacitance
Begin with Vo*Po=V*P for the air.
V = Po*Vo/P
dV/dt = Po*Vo * -1/P^2 * dP/dt = dVair/dt
Q = dVwater/dt = -dVair/dt
Q = Po*Vo/P^2 * dP/dt
So, C = Po*Vo/P^2.
If the predcess is not isothermal, you start with
PoVo^n = P*V^n and arrive at
C = Vo*Po^(1/n) / [n * P^((n+1)/n)]