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air flow from multiple outlets

air flow from multiple outlets

air flow from multiple outlets

(OP)
Hi

I have air coming in from a tank (one inlet) and going out from two outlets.

The inlet has flowmeter metering Sm3/hr with actual P,T also defined. I also have another flow meter metering at one of the outlets giving me actual flowrate (also  P,T) but i dont have any meter on the second outlet neither know the P, T. How can I calculate the flowrate from the this second outlet. I am confused i did some calculations but i am nt confident.

Any suggestions/help will be appreciated.

Aly

RE: air flow from multiple outlets

Convert the inlet (I) and outlet (O1) flow you know to a molar flow rate.  PV = nRT  Then, if there is no reaction, O2 = I - O1.

Good luck,
Latexman

RE: air flow from multiple outlets

Instead of the difference in molar flow rates, you can calculate the difference in mass flow rates.

RE: air flow from multiple outlets

(OP)
Thanks Latexman & Chicopee

I have calculated the all mass flow rates ........ now i want to calculate the volume flowrate of O2.

the P,T values are known at inlet and at one of the 2 outlets i.e O1.without P,T at O2 how to find volume flowrate at O2.

any idea or rough estimation?

Aly

RE: air flow from multiple outlets

Ali768,

Without T and P at O2, you cannot find the volumetric flow rate at O2.

Any idea?  Measure T and P at O2, or if you know how much heat is transfered and what the pressure drop is for the air on the way to O2, estimate T and P.

Good luck,
Latexman

RE: air flow from multiple outlets

Since you know the chemical formula of air,calculate the %molar values of the components and multiply each % value to the air pressure to calculate the partial pressures of the components including oxygen (O2).

RE: air flow from multiple outlets

(OP)
sorry did not understand your recent post........

(I) is the inlet, O1 is the first outlet and O2 is the second outlet. With massflowrates, O2 = I - O1.

P,T  at inlet and at O1 is known, the two (I and O1) are at about 12 meters from each other where as O2 is at about 38m from (I).

RE: air flow from multiple outlets

whose last post?

Good luck,
Latexman

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