Handbook of Electrical Engineering

20 HANDBOOK OF ELECTRICAL ENGINEERING Aero-derivative generators are available in single unit form for power outputs from about ...

GAS TURBINE DRIVEN GENERATORS 21 Figure 2.1 Relative cost of gas turbo-generators versus power rating. Figure 2.2 Weight of gas ...

22 HANDBOOK OF ELECTRICAL ENGINEERING Figure 2.3 Single-shaft gas turbine. Figure 2.4 Two-shaft gas turbine. In a two-shaft gas ...

GAS TURBINE DRIVEN GENERATORS 23 removable coupling shaft between the two turbines. Some points to consider with regard to the t ...

24 HANDBOOK OF ELECTRICAL ENGINEERING Figure 2.5 Gas turbine thermodynamic cycle. Simple-cycle gas turbine. ‘simple-cycle’ versi ...

GAS TURBINE DRIVEN GENERATORS 25 Figure 2.6 Pressure versus volume in the thermodynamic cycle. Figure 2.7 Temperature versus ent ...

26 HANDBOOK OF ELECTRICAL ENGINEERING Where,Cp is the specific heat of the air at constant pressure, kcal/kg K
1. 005 Cv is the ...

GAS TURBINE DRIVEN GENERATORS 27 From here onwards the following substitutions will be used in order to keep the presentation of ...

28 HANDBOOK OF ELECTRICAL ENGINEERING Figure 2.8 Per-unit pressure ratio versus power rating. Figure 2.9 Exhaust temperature ver ...

GAS TURBINE DRIVEN GENERATORS 29 2.2.1 Effect of an inefficient compressor and turbine Frictional losses in the compressor raise ...

30 HANDBOOK OF ELECTRICAL ENGINEERING Therefore, ηp= 0. 32 = 1223 ( 1. 0 − 0. 51796 )ηc( 0. 86 )− 298 ( 1. 93063 − 1. 0 ) 1223 η ...

GAS TURBINE DRIVEN GENERATORS 31 Where d= 1 2 δ which when substituted in (2.26) gives the maximum work doneUoutemax. 2.2.2.1 Wo ...

32 HANDBOOK OF ELECTRICAL ENGINEERING The energy equations for the compressor and turbine become, Ucea=Cpc(T 2 −T 1 ) ( 1 ηc ) k ...

GAS TURBINE DRIVEN GENERATORS 33 The effects ofP 1 ,P 23 andP 4 can be found by modifying their corresponding pressure ratios ...

34 HANDBOOK OF ELECTRICAL ENGINEERING The turbine energy changes fromUteatoUtea+Utea. Substitute (2.40) into (2.29), Utea+Utea ...

GAS TURBINE DRIVEN GENERATORS 35 2.2.5 Heat rate and fuel consumption The heat rate is the ratio of heat given up by the fuel, i ...

36 HANDBOOK OF ELECTRICAL ENGINEERING Figure 2.11 Heat rate and efficiency versus power rating. The reduction in output power is ...

GAS TURBINE DRIVEN GENERATORS 37 Therefore it is a simple matter to predetermine the required output power and divide this by th ...

38 HANDBOOK OF ELECTRICAL ENGINEERING power versus ambient temperature characteristic. Therefore care must be exercised to be su ...

GAS TURBINE DRIVEN GENERATORS 39 this affects the maintenance staff and total noise level permitted by international or national ...