1
Q
Density of Air
A
P/RT
2
Q
Density of Flue Gas
A
P/RT
3
Q
Draft Head, Pw
A
(density of air-density of gas)gH
H = height of chimney
4
Q
Volume Flow Rate of Flue Gas, Vg
A
mRT/P
5
Q
Theoretical Velocity of Flue Gas, Vt
A
√2ghw
6
Q
Actual Velocity of Flue Gas, Va
A
(0.3 to 0.5)Vt
7
Q
Chimney Diameter, D
A
D=√(4Vg/πVa)
8
Q
Gas Constants,R
A
8.3143/MW
1545/MW
9
Q
Draft head, hw
A
hw=hv=hs
hv= v^2/2g
hs= P/ρg
