Nomenclature r_c	Fluid density.
μ_c	Average fluid viscosity.
DP_b_,i	Pressure loss in a cross-flow section.
DP_c	Total pressure loss on the side of the shell.
DP_w_,i	Pressure loss in a window section.
μ_wc	Fluid Viscosity wall temperature.
A	Heat transfer area.
Cp_c	Specific heat.
e_t	Tube thickness.
F_c	Total fraction of tubes in cross flow.
F	Correction factor heat exchanger configuration.
f_i	Correction factor due to friction.
F_sbp	Fraction cross flow area available for recirculation flow.
g	Acceleration of gravity.
h_cc	Fluid convection coefficient outside the tubes.
h_io	Convection coefficient of the fluid by the tube side.
	Basic correction factor for adverse effect of the temperature gradient.
J_b	Correction factor recirculation effect.
J_c	Effect correction factor baffle configuration.
J_i	Correction factor due to friction.
J_l	Correction factor for leakage effect.
J_r	Correction factor adverse effect of the temperature gradient.
J_s	Correction factor for baffle uneven spacing effect on entry and exit.
k	Thermal conductivity of the tube material.
k_c	Thermal conductivity of the fluid.

l_s	Spacing between baffles.
l_s_,I, l_s_,o	Spacing of baffles at the entrance and exit.
N_b	Number of baffles.
N_c	Number of rows in cross flow section.
N_cw	Number of rows in section window.
N_ss	Numbers Stamp/sides sealed.
N_t	Number of tubes.
Q	Heat flux exchanged.
R_b	Correction factor recirculation effect.
R_d	Total coefficient of fouling.
Re_c	Reynolds number.
R_l	Correction factor for leakage effect.
R_s	Correction factor adverse effect of the temperature gradient.
S_sb	Correction factor for baffle uneven spacing effect on entry and exit.
S_tb	Thermal conductivity of the tube material.
T_mlc	Thermal conductivity of the fluid.
U_dc	Spacing between baffles.
W_c	Spacing of baffles at the entrance and exit.