| ADIGT | Aero-derivative industrial gas turbines | |
| ADIGT-CHP | Aero-derivative industrial gas turbines combined-heat-and-power | |
| CHP | Combined-heat-and-power | |
| DP | Design-point | |
| GT | Gas turbine | |
| IC | Intercooled cycle | |
| ICR | Intercooled-recuperated cycle | |
| ISA | International standard atmosphere | |
| ISA Dev | International standard atmosphere deviation | |
| OD | Off-design point | |
| RC | Recuperated | |
| SS | Small-scale | |
| SS-ADIGT | Small-scale aero-derivative industrial gas turbines | |
| SS-ADIGT-CHP | Small-scale aero-derivative industrial gas turbines combined-heat-and-power | |
| TET | Turbine entry temperature | |
| TURBOMATCH | Gas turbine engine performance simulation code | |
| C | Specific heat | kJ/kg |
| cp | Specific heat at constant pressure | kJ/kg |
| cpa | specific heat at constant pressure of air | kJ/kg |
| FF | Fuel flow in combustor | Kg/s |
| H | Specific enthalpy | kJ/kg |
| ha | Water specific enthalpy at economiser inlet | kJ/kg |
| hc | Saturated water specific enthalpy at evaporator inlet | kJ/kg |
| hd | Saturated steam specific enthalpy at evaporator exit | kJ/kg |
| he | Superheated steam specific enthalpy | kJ/kg |
| LHV | Low heating value of fuel | kJ/kg |
|
| Fuel mass flow in combustor | Kg/s |
| PE | Electrical power | kWe |
| PT | Gas turbine power | kW |
| Q | Heat flow | kW |
| qin | Heat flow in | kW |
| qout | Heat flow out | kW |
| Q4x | Total heat transfer in superheater and evaporator | kW |
| Qcomb | Combustor heat input | kW |
| Qecon | Economiser duty | kW |
| Qevap | Evaporator duty | kW |
| Qsuper | Superheater duty | kW |
| QHRSG | HRSG duty | kW |
| T | Temperature | K |
| Ta | Water temperature at HRSG economiser inlet | K |