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Total fuel input (LHV) per kWh output

= 11,045 Btu (LHV)

Total energy recovered per kWh output

= 6,380 Btu (52%)

Efficiency of displaced boiler

= 82%

O&M cost for total system per kWh output

= $0.008/kWh

Fuel cost (natural gas) for the gas turbine

= $3.50/Mcf

Fuel cost (natural gas) for the displaced boiler

= $2.70/Mcf

Total fuel input (LHV) per kWh gas turbine output

Steam turbine kW output per kW gas turbine output

Energy recovered per kWh combined cycle output

Efficiency of displaced boiler

O&M cost for total system per kWh output

Fuel cost (natural gas)

Example 4

Combined-Cycle Cogeneration System Applied to Electric Power Generation (Gas Turbine System with Back-Pressure Steam Turbine)

Full-load Performance Values

Total fuel input (LHV) per kWh gas turbine output

Steam turbine kW output per kW gas turbine output

Energy recovered per kWh combined cycle output

Efficiency of displaced boiler

O&M cost for total system per kWh output

Fuel cost (natural gas)

= 11,300 Btu (LHV) = 0.175 kW (597 Btu/kWh) = 4,540 Btu = 83%

Fuel input (HHVBasis) _ 11,045 Btu/hp-h x 1.11 _ 12,279 Btu/hp-h

The thermal efficiency (HHV Basis) for simple-cycle operation, based on Equation 2-9, is:

The fuel rate, on an HHV basis, for simple-cycle operation, based on Equation 2-12, is:

12270 Btu/kWh _ 12.029 cf/kWh 1,020 Btu/cf

The ECP (HHV Basis), based on Equation 2-19, is:

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