Sizing - Pietro Fiorentini
Sizing - Pietro Fiorentini
Sizing - Pietro Fiorentini
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<strong>Sizing</strong> the Control Valve<br />
A. Subcritical conditions<br />
(when ΔP < 0.5F 2 P1)<br />
Volume flow rate (gas and vapor)<br />
Q = 290 Cv<br />
P Δ (P1+P2)<br />
G T<br />
Weight flow rate (gas and vapor)<br />
Q = 355 Cv<br />
GΔP (P1+P2)<br />
T<br />
Weight flow rate (saturated steam)<br />
W = 13,55 Cv ΔP (P1+P2)<br />
Weight flow rate (overheated steam)<br />
Cv ΔP (P1+P2)<br />
W = 13,55<br />
(1+0,00126Δt)<br />
B. Critical conditions<br />
(when ΔP 0.5F2 P1)<br />
Volume flow rate (gas and vapor)<br />
262 F Cv P1<br />
Q =<br />
G T<br />
Weight flow rate (gas and vapor)<br />
W = 321 F Cv P1<br />
G<br />
T<br />
Weight flow rate (saturated steam)<br />
W = 11,73 F Cv P1<br />
Weight flow rate (overheated steam)<br />
F Cv P1<br />
W = 11,73<br />
(1+0,00126 Δ t)<br />
Deltaflux<br />
GAS, VAPOR AND STEAM BIPHASE FLUIDS<br />
A. Subcritical conditions<br />
(when ΔP < 0.5F 2 P1)<br />
Constant liquid/gas mixture ratio (liquid containing<br />
non condensable gas or liquid containing high title<br />
vapor)<br />
W = 19,1 Cv ΔP (w1+w2)<br />
Variable liquid/vapor mixture ratio (liquid containing<br />
low title vapor, less then 0.5)<br />
W = 27,1 Cv ΔP w1<br />
B. Critical conditions<br />
(when ΔP ≥ 0.5F 2 P1)<br />
Constant liquid/gas mixture ratio (liquid containing<br />
non condensable gas or liquid containing high title<br />
vapor)<br />
W = 13,5 F Cv P1 (w1+w2)<br />
Variable liquid/vapor mixture ratio (liquid containing<br />
low title vapor, less then 0.5)<br />
W = 19,1 F Cv P1 w1<br />
100<br />
w1 =<br />
Xg (Vg1-Vf) + 100 Vf<br />
100<br />
w2 =<br />
Xg (Vg2-Vf) + 100 Vf
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