Acronyms
CC	Combined cycle
CCGT	Combined cycle gas turbine
CCGT-R-DRDE	CCGT with recuperative GT and DRDE cycle
CSP	Concentrating solar power
DRDE	Double recuperative double expansion
GT	Gas turbine
HP	High pressure
HRSG	Heat recovery steam generator
HRVG	Heat recovery vapor generator
HTF	Heat transfer fluid
ISCC	Integrated solar combined cycle
ISCC-R-DRDE	ISCC with recuperative GT and DRDE cycle
LP	Low pressure
O&M	Operation and maintenance
ORC	Organic Rankine cycle
PTC	Parabolic trough collectors
SSG	Solar steam generator
ST	Steam turbine
SVG	Solar vapor generator
TMY	Typical meteorological year
VT	Vapor turbine
Symbols
C	Cost of energy (€·J−1)
DNI	Direct normal irradiation (W·m−2)
E	Energy (J)
h	Hour (h)
Hc	Lower heating value (J·kg−1)
HR	Heat rate (-)
IAM	Incidence angle modifier (-)
LC	Levelized cost (€)
LCOE	Levelized cost of energy (€·J−1)
ṁ	Mass flow rate (kg·s−1)
n	Yearly frequency (-)
p	Pressure (Pa)
P	Power (W)
$\dot{Q}$	Thermal power (W)
t	Time (s)
T	Temperature (K)
U	Overall heat transfer coefficient (W·K−1·m−2)
UA	Thermal conductance (W·K−1)
Greek letters
Δ	Increment
ε	Effectiveness (-)
ξ	Pressure drop (-)
η	Efficiency (-)
Subscripts
amb	Ambient
exh	Exhaust gas
f	Fuel
gt	Gas turbine
inv	Investment
ise	Internal solar-to-electricity
l	Length coordinate
max	Maximum
R	Recuperator
sol	Solar
st	Steam turbine
tot	Total