$C_P$	Specific heat at constant pressure ($\mathrm{kJ}/(\mathrm{kg}\cdot \mathrm{K})$)
$C_v$	Specific heat at constant volume ($\mathrm{kJ}/(\mathrm{kg}\cdot \mathrm{K})$)
$E$	Effectiveness of heat exchanger
$k$	Specific heat ratio (-)
$\dot{m}$	Mass flow rate of the working fluid ($\mathrm{kg}/\mathrm{s}$)
$N$	Number of heat transfer units
$P$	Cycle power ($\mathrm{W}$)
$\dot{Q}$	Quantity of heat transfer rate ($\mathrm{W}$)
$T$	Temperature ($\mathrm{K}$)
$U$	Heat conductance ($\mathrm{kW}/\mathrm{K}$)
$U_T$	Total heat conductance ($\mathrm{kW}/\mathrm{K}$)
$u$	Heat conductance distribution
Greek symbols
$\tau$	Temperature ratio
$\eta$	Cycle thermal efficiency
Subscripts
$H$	Hot-side
$L$	Cold-side
$\max$	Maximum value
$opt$	Optimal
$P$	Maximum power point
$\eta$	Maximum thermal efficiency point
$1-3,3S$	Cycle state points