c	unit exergoeconomic cost; (USD GJ${}^{-1}$),
$c_P$	specific heat capacity at constant pressure; (kJ (kgK)${}^{-1}$),
$\mathcal{D}$	set of dissipative component,
$\dot{E}$	exergy flow rate; (kW or MW),
$E^{*}$	exergetic cost; (kW),
$EOC$	exergoeconomic cost; (USD h${}^{-1}$),
$\dot{F}$	resource exergy flow rate; (kW or MW),
$F^{*}$	exergetic cost of the resource; (kW or MW),
$far$	fuel to air ratio; (kg${}_{\mathrm{f}}$ kg${}_{air}^{-1}$),
$\dot{H}$	enthalpy flow rate; (kW or MW),
h	specific enthalpy; (kJ kg${}^{-1}$),
$\dot{I}$	irreversibility flow rate; (kW),
$IP$	intermediate pressure; (bar),
$k^{*}$	unit exergy cost; (-),
$LHV$	lower heat value; (kJ kg${}_f^{-1}$),
m	mass fraction; (-),
$\dot{m}$	mass flow rate; (kg s${}^{-1}$),
$\mathcal{P}$	set of productive components.
P	pressure; (bar),
$\dot{P}$	product exergy flow; (kW),
$P^{*}$	exergetic cost of the product; (KW)
$\dot{Q}$	heat flow rate; (kW),
q	specific heat; (kJ kg${}^{-1}$),
R	gas constant; (kJ (kg K)${}^{-1}$),
$\dot{R}$	residue exergy flow rate; (kW),
$R^{*}$	exergetic cost of the residue; (KW)
$RH$	relative humidity; (%),
$SFC$	specific fuel comsumption; (kg${}_{\mathrm{f}}$ (kWh)${}^{-1}$),
$SSC$	specific steam comsumption; (kg${}_{\mathrm{s}}$ (kWh)${}^{-1}$),
$\dot{S}$	entropy generation; (kW),
s	specific entropy; (kJ (kgK)${}^{-1}$),
T	temperature; (${}^{\circ }$C, K),
$TIT$	turbine inlet temperature; (K),
t	time; (s),
v	steam specific volume; (m${}^3$ kg${}^{-1}$)
$\dot{W}$	power; (MW),
w	work per unit of mass; (kJ kg${}^{-1}$),
X	stoichiometric coefficient; (%),
x	ratio of the particular gas constant to heat capacity of constant pressure, $x=R{c}_p^{-1}$; (-),
y	ratio of $T_{g3}$ to $T_{g1}$; (-),
Z	capital and operation costs; (USD h${}^{-1}$).
Greek symbols
$\alpha$	stoichiometric coefficient; (%),
$\beta$	cost allocation ratio for the waste heat dissipated in the condenser; (-),
$\epsilon$	exergy per unit mass; (kJ (kg)${}^{-1}$),
$\eta$	efficiency; (%),
$\pi$	Relative humidity; (%),
$\lambda$	excess of air; (%),
$\mu$	cost ratio for the exhaust gases dissipated in the stack; (-),
${\Omega }_g$	set of productive components of the gas turbine and the HRSG on the gas-side,
$\Pi$	exergoeconomic cost; (USD (h)${}^{-1}$),
$\pi$	compression pressure ratio; (-),
$\psi$	cost distribution ratio; (-),
$\rho$	residue cost allocation ratio; (-).
Subscripts
0	dead state,
a	ambient,
$af$	adiabatic flame,
$air$	air,
$CV$	control volumen,
$cg$	combustion gas,
$cw$	cooling water,
D	destruction.
$DA$	dry air,
e	exit,
$ex$	exergetic,
F	resource,
f	fuel,
$gen$	generation,
g	gas
$g_1,\dots ,g_4$	thermodynamic state of the gas turbine,
$g_5,\dots ,g_{13}$	thermodynamic state of the heat recovery steam generator,
H	supplied
$HA$	humid air,
$mGT$	output of gas turbine,
$mSC$	output of steam turbine,
$op$	optimum (maximum),
$pp$	pinch-point,
$prod$	productive,
r or R	residue,
s	steam,
$st$	stoichiometric,
$surr$	surroundings,
t	turbine,
$th$	thermal,
$tot$	total,
$v_1,\dots ,v_{17}$	thermodynamic state of the steam cycle.
Superscripts
0	dead state,
$air$	air,
$cg$	combustion gas,
g	gas,
$\dot{I}$	irreversibility flow,
$prod$	productive,
$\dot{S}$	entropy generation,
v	steam.