Acronyms
ATC	Annual Total Cost
CELF	Constant-escalation levelization factor
CFD	Computational Fluid Dynamics
CHHE	Compact Honeycomb Heat Exchanger
CHX	Compact Heat Exchanger
CRF	Capital-recovery factor
DOE	U.S Department of Energy
HX	Heat Exchanger
MS	Molten salt
PCHE	Printed Circuit Heat Exchanger
SHX	Source Heat Exchanger
STHX	Shell and Tube Heat Exchanger
STPP	Solar Thermal Power Plant
TES	Thermal Energy Storage
Latin letters
A	Area (m2)
c	Specific heat (J/kg/°C)
C	Cost ($)
CC	Capital Cost ($)
CE	Cost per unit of exergy ($/Wh)
CB	Base cost ($)
Dh	Hydraulic diameter (m)
d	Diameter (m)
dP	Pressure Drop (Pa)
$\dot{E}x$	Exergy (W)
f	Darcy pressure friction loss factor
FP	Pressure factor
FM	Material of construction factor
FL	Tube length correction factor,
hconv	Convection heat transfer coefficient (W/m2/°C)
ieff	Weighted average capital cost
k	Thermal conductivity (W/m/°C)
L	Length (m)
$\dot{m}$	Mass flow rate (kg/s)
N	Number of heat exchanger elements
n	Number of years
Nu	Nusselt number
p	Pressure (Pa)
Pr	Prandtl number
$\dot{Q}$	Thermal power (W)
rn	Nominal escalation rate
Re	Reynolds number
T	Temperature (°C)
TA	Temperature Approach (°C)
U	Overall heat transfer coefficient (W/m2/°C)
u	Velocity (m/s)
V	Volume (m3)
Y	Yearly operation time
Greek Letters
ρ	Density (kg/m3)
$\mu$	Dynamic viscosity (Pa·s)
Subscripts
ave	Average
net	Net
p	Pressure
th	Thermal