$a_w$	Water activity in NaCl solution
c	Concentration of water, mol/m3
$C_{fm}$	Feed-membrane concentration, mol/m3
$C_{mp}$	Membrane-permeate concentration, mol/m3
$C_p$	Heat capacity, J/[kg·K]
$d_p$	Membrane pore size, m
$D_k$	Knudsen diffusion coefficient, m2/s
$D_p$	Poiseuille flow coefficient, m2/s
E D	Energy destruction, kW/m2
E feed	Exergy destruction on the feed side, kW/m2
E membrane	Exergy destruction in the membrane, kW/m2
E permeate	Exergy destruction on the permeate side, kW/m2
F	Volume force vector
I	Unit tensor
$k_m$	Thermal conductivity coefficients of membrane, W/[m·K]
$k_g$	Thermal conductivity coefficients of vapor, W/[m·K]
$k_s$	Thermal conductivity coefficients of solid, W/[m·K]
M	Water(vapor) molecular weight, g/mol
$p$	Dynamic pressure, Pa
P	Mean pressure, Pa
$\mathrm{q}$	Heat flux, W/m2
Q	Heat source, W/m3
Q T	Total heat transferred by the membrane, kW
R	Gas constant, J/[mol·K]
T	Temperature, K
T 0	Temperature of the environment, °C
$T_m$	Mean temperature, K
$T_{fm}$	Feed temperature on the membrane surface, °C
$T_{pm}$	Permeate temperature on the membrane surface, °C
$T_{fb}$	Feed temperature in bulk fluid, °C
$T_{pb}$	Permeated temperature in bulk fluid, °C
$\mathrm{u}$	Velocity vector, m/s
$x_w$	Liquid mole fraction of water
$x_{NaCl}$	Liquid mole fraction of NaCl solution
$\mathsf{\rho }$	Density, kg/m3
$\mathsf{\mu }$	Viscosity, N·s/m2
$\mathsf{\epsilon }$	Porosity of the membrane
$\mathsf{\tau }$	Tortuosity of the membrane
$\nabla$	Dell operator