ValveCoef_Comp_CL
The procedure ValveCoef_Comp_CL uses simple sizing equations to determine the valve coefficients (C_v and K_v) for a valve with compressible flow given the flow conditions, pressure drop and required flow rate. The method programmed in this procedure is a simplified method described here as well in other sources. A more complex method is programmed in the procedure ValveCoef_Comp_ISA75_CL.
ValveCoef_Comp_CL(F$,T_1,P_1,P_2,Q:K_v, C_v)
Inputs:
F$ fluid
T_1 inlet temperature (C, K, F, or R)
P_1,P_2 inlet and outlet pressures (kPa, Pa, bar, MPa, atm, or psi)
Q flow rate at standard conditions (m^3/s or ft^3/min)
Output:
K_v SI valve coefficient (-), returned as dimensionless but technically this is measured as m^3/hr of water passing through a valve with a pressure drop of 1 bar
C_v English valve coefficient (-), returned as dimensionless but technically this is measured as gpm of water passing through a valve with a pressure drop of 1 psi
Example:
$Load Component Library
$UnitSystem SI Mass J Pa K
F$ = 'Argon'
T_1 = 320 [K]
P_1 = 1500e3 [Pa]
P_2 = 300e3 [Pa]
Q = 0.01 [m^3/s]
CALL ValveCoef_Comp_CL(F$,T_1,P_1,P_2,Q:K_v, C_v)
{Solution:
K_v = 0.8203 [-]
C_v = 0.9483 [-]
}