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Kv calculation for depressurization valve

Kv calculation for depressurization valve

Kv calculation for depressurization valve


I'm having some trouble with this problem. Does anybody can help me, please?

Calculate Kv (range) of a valve that has to be used to have a constant depressurization of a vessel with supercritical Co2 inside. The vent is in atmosphere.

Initial Pressure: 120 bar

Temperature: 40 °C constant (heater)

Volume vessel: 10 liters = 0.01 m^3

- What Kv formula should I use for supercritical fluid?

- If I would obtain a constant depressurization (e.g. 4 bar/min), is volumetric flow constant in all the process, right?

depressurization time = 120 bar/(4bar/min) = 30 min = 0.5 h

volumetric flow = volume (constant)/time = 0.01/0.5 = 0.02 m^3/h

- Does mass flow change because pressure change so density change, isn't it?

RE: Kv calculation for depressurization valve

assuming pout << 0.5 * Pin the formula is that for critical flow,
yes, mass flow depends from density with (probably) a initial high value.

RE: Kv calculation for depressurization valve

sounds like school work

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