$c$	Specific exergy cost $\left(\$/\mathrm{kJ}\right)$
$\dot{C}$	Cost rate associated with exergy transfer $\left(\$/\mathrm{s}\right)$
$CEPCI$	Chemical Engineering Plant Cost Index
$CRF$	Capital Recovery Factor
$ex$	Specific exergy $\left(\mathrm{kJ}/\mathrm{kg}\right)$
$\dot{Ex}$	Exergy rate $\left(\mathrm{kW}\right)$
$f$	Exergoeconomic factor
$f_{ei}$	Exergoenvironmental impact factor
$f_{es}$	Exergetic stability factor
$h$	Specific enthalpy $\left(\mathrm{kJ}/\mathrm{kg}\right)$
$i$	Rate of interest
$LCOE$	Levelized Cost of Electricity $\left(\$/\mathrm{kWh}\right)$
$\dot{m}$	Mass flow rate $\left(\mathrm{kg}/\mathrm{s}\right)$
$N$	Annual plant operation hours
$n$	Power plant lifetime
$ORC$	Organic Rankine cycle
$P$	Pressure $\left(\mathrm{kPa}\right)$
$PBP$	Pay-back period $\left(\mathrm{year}\right)$
$PEC$	Purchased Equipment Costs ($\$$)
$\dot{Q}$	Heat transfer rate $\left(\mathrm{kW}\right)$
$r$	Relative cost difference
$s$	Specific entropy $\left(\mathrm{kJ}/\mathrm{kgK}\right)$
$T$	Temperature $\left({}^{°}\mathrm{C}\right)$
$\dot{W}$	Power $\left(\mathrm{kW}\right)$
$x$	Quality
$y$	Exergy destruction ratio
$z$	Well depth
$Z$	Capital cost of components $\left(\$\right)$
$\dot{Z}$	Capital cost rate of components $\left(\$/\mathrm{s}\right)$
Greek Symbols
$\eta$	Efficiency $\left(\%\right)$
$\phi$	Maintenance factor
${\theta }_{ei}$	Exergoenvironmental impact index
${\theta }_{eii}$	Exergoenvironmental impact improvement factor
${\theta }_{est}$	Exergetic sustainability index
Subscripts
$Cond$	Condenser
$D$	Destruction
$EV$	Expansion valve
$Sep$	Separator
$FT$	Flash turbine
$ORCT$	ORC turbine
$P$	Pump
$Eva$	Evaporator
$F$	Fuel
$P$	Product
$Ph$	Physical
$q$	Specific heat rate
$w$	Specific work rate
$Tot$	Total
$i$	inlet
$e$	exit
$0$	Ambient