Finned circular tubes DP
The procedure:
Procedure chx_dp_finned_circular_tube(TypeHX$, m_dot, A_fr, L, Fluid$, T_i, T_o, P: DELTAp)
provides the pressure drop associated with a finned circular tube compact heat exchanger surface. These data are from Kays and London (1994).
Inputs
TypeHX$: string identifying the geometry
CF-7.34 : 'fc_tubes_sCF-734'
CF-8.72 : 'fc_tubes_sCF-872'
CF-8.72(c) : 'fc_tubes_sCF-872c'
CF-7.0-5/8J : 'fc_tubes_sCF-70-58J'
CF-8.7-5/8J(a) : 'fc_tubes_sCF-87-58Ja'
CF-8.7-5/8J(b) : 'fc_tubes_sCF-87-58Jb'
CF-9.05-3/4J(a) : 'fc_tubes_sCF-905-34Ja'
CF-9.05-3/4J(b) : 'fc_tubes_sCF-905-34Jb'
CF-9.05-3/4J(c) : 'fc_tubes_sCF-905-34Jc'
CF-9.05-3/4J(d) : 'fc_tubes_sCF-905-34Jd'
CF-9.05-3/4J(e) : 'fc_tubes_sCF-905-34Je'
CF-8.8-1.0J(a) : 'fc_tubes_sCF-88-10Ja'
CF-8.8-1.0J(b) : 'fc_tubes_sCF-88-10Jb'
8.0-3/8T : 'fc_tubes_80_38T'
7.75-5/8T : 'fc_tubes_775-58T'
m_dot: mass flow rate (kg/s or lbm/hr)
A_fr: frontal area as viewed by the flow approaching the tube bank (m^2 or ft^2)
L: length of the heat exchanger (m or ft)
Fluid$: string indicating the fluid type
T_i: inlet temperature of the fluid (K, C, R, or F)
T_o: outlet temperature of the fluid (K, C, R, or F)
P: absolute pressure of the fluid (Pa, kPa, bar. MPa, atm, or psi)
Output
DP: heat transfer coefficient (Pa, kPa, bar. MPa, atm, or psi)
Note that the length is defined from the tip of the first row to the point where the next tube would be after the last row, as shown below.
Example
$UnitSystem SI Mass J K Pa
TypeHX$='fc_tubes_sCF-88-10Jb'
m_dot=0.7 [kg/s]
A_fr=0.1 [m^2]
L=1 [m]
Fluid$='Air'
T=300 [K]
T_i=300 [K]
T_o=300 [K]
P=101325 [Pa]
Call chx_dp_finned_circular_tube(TypeHX$, m_dot, A_fr, L, Fluid$, T_i, T_o, P: DELTAp)
{Solution is:
DELTAp = 558.3 [Pa]}
Related procedures include: