CO2	carbon dioxide	${\dot{\mathrm{Q}}}_{\mathrm{heater}}$	heat input to Heater (kW)
LNG	liquefied natural gas	${\dot{\mathrm{Q}}}_{\mathrm{reheater}}$	heat input to Reheater (kW)
$s$	specific entropy (kJ/kg K)	ER	Expansion ratio
$T_{ref}$	reference temperature (°C, K)	Subscripts
$T_{source}$	source temperature (°C, K)	j	state point
p	pressure (kPa)	in	inlet
LTR	low temperature recuperator	out	outlet
MTR	medium temperature recuperator	T1	turbine 1
HTR	high temperature recuperator	T2	turbine 2
TIP	turbine inlet pressure (kPa)	C1	compressor 1
SR	split ratio	C2	compressor 2
PR	pressure ratio	C3	compressor 3
T	temperature (°C, K)	HI	inlet of hot stream to heat exchanger
TIT	turbine inlet temperature (°C, K)	HO	outlet of hot stream to heat exchanger
$\dot{\mathrm{W}}$	power (kW)	CI	inlet of cold stream to heat exchanger
$I$	Irreversibility	CO	outlet of cold stream to heat exchanger
$\dot{\psi }$	exergy (kJ/kg)	input	input
${\mathsf{\eta }}_{\mathrm{th}}$	thermal efficiency	source	source
${\eta }_{exergy}$	exergy efficiency	$loss,{CO}_2$	loss by CO2
${\dot{\mathrm{W}}}_{\mathrm{net},\mathrm{turbine}}$	net power output from turbines (kW)	$gain,air$	gain by air
${\dot{\mathrm{W}}}_{\mathrm{net},\mathrm{compressor}}$	net input power to compressors (kW)	t	total
$ϵ$	heat exchanger effectiveness
h	enthalpy (kJ/kg)
$\dot{m}$	mass flow rate (kg/s)