A	area, m2
cp	specific heat, J kg−1 K−1
D	diffusivity, m2 s−1
d	diameter, m
dp	mean pore diameter, m
Dvm	effective moisture diffusivity, m2 s−1
Hol	overall heat transfer, W m−2 K−1
h	heat transfer coefficient, W m−2 K−1
habs	absorption heat, J kg−1
hmix	enthalpy of mixing, J kg−1
hv	heat of evaporation of water, J kg−1
Kol	overall mass transfer, m s−1
Kp	partition coefficient of a solution
k	mass transfer coefficient, m s−1
L	length of hollow fiber, m
$\dot{\mathrm{m}}$	mass flow rate, kg s−1
m*	ratio of air mass flow to solution mass flow
NTU	number of transfer units
Nu	Nusselt number
$\dot{\mathrm{P}}$	electric power demand, W
p	pressure, Pa
Pr	Prandtl number
R	resistance
$\dot{\mathrm{Q}}$	heating capacity, cooling capacity, W
Re	Reynolds number
Sc	Schmidt number
Sh	Sherwood number
t	temperature, °C
W	width of membrane module, m
x, y	axial coordinates, m
Greek Letters
ε	effectiveness
εp	porosity
φ	packing fraction
ϕ	concentration of water
ρ	density, kg m−3
τ	tortuosity
η	device efficiency
λ	heat conductivity, W m−1 K−1
ω	humidity ratio, kg kg−1
μ	dynamic viscosity, Pa s
δ	membrane thickness, m
Subscripts
1	inlet
2	outlet
3	mixed
a	air
EC	evaporative cooling
exp	experimental
D	dehumidification
f	fluid
F	fan
h	hydraulic
i	inner
l	liquid
ln	logarithmic
m	membrane
mod	model
o	outer
P	pump
reg	regeneration
s	solution
so	solid
sup	supply
tot	total
w	water
W	wall