Flue gas mixture volume flow calc
Flue gas mixture volume flow calc
(OP)
I think I am just having a mind blank here so apologies if this is simple!
I have two gas streams mixing (flue gas and air). I know the flow rate of the combined stream, I also know the temperature of all three streams and can calculate the combined Cp.
I need to know the flow rates of the flue gas and air streams. I am thinking that I need to go and measure one of them.
So far I have:
m3 = m1 + m2
Q3 = Q1 + Q2
Q3 = (m3-m2)(Cp1T1) + (m3-m1)(Cp2T2)
Unknowns are m1 and m2.
Can someone please put me out of my misery? Is my thinking right that I just need to go and measure one?
Cheers,
James
I have two gas streams mixing (flue gas and air). I know the flow rate of the combined stream, I also know the temperature of all three streams and can calculate the combined Cp.
I need to know the flow rates of the flue gas and air streams. I am thinking that I need to go and measure one of them.
So far I have:
m3 = m1 + m2
Q3 = Q1 + Q2
Q3 = (m3-m2)(Cp1T1) + (m3-m1)(Cp2T2)
Unknowns are m1 and m2.
Can someone please put me out of my misery? Is my thinking right that I just need to go and measure one?
Cheers,
James





RE: Flue gas mixture volume flow calc
You can start for example from
(tmix-t1)*cp1*w1-(tmix-t2)*cp2*w2 = 0
w2 = wtot-w1
etc.
RE: Flue gas mixture volume flow calc
If you know Q3, m3, T1, T2, Cp2 and Cp1, then, from your last equation:
put (m3-m1) = m2
and having just one unknown, m2, proceed to
m2 = (Q3-m3Cp1T1)÷(Cp2T2-Cp1T1)
RE: Flue gas mixture volume flow calc