T_b

Temperature at HRSG economiser exit

K

T_c

HRSG steam saturation temperature

K

T_e

HRSG superheated steam temperature

K

T_x

Exhaust gas temperature at pinch point of HRSG

K

T_y

Exhaust gas temperature at HRSG evaporator exit

K

T₄

Gas turbine exhaust temperature to HRSG

K

ΔT_4y

Gas temperature drop in superheater

K

ΔT_x1

Gas temperature drop in the economiser

K

η_th

Thermal efficiency

%

η₁

First law CHP efficiency

%

η₂

Second law CHP efficiency

%

η_E

Electrical generator efficiency

%

w_g

Exhaust gas mass flow

Kg/s

w_s

Steam mass flow

Kg/s

Electrical energy rate

kW

Steam energy rate

kW

Entropy released by fuel combustion

kJ/kg∙K

Low heating value of fuel

kJ/kg