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Combined Cycle (CCGT) Power Plant Efficiency Calculator mechanical
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Combined Cycle (CCGT) Power Plant Efficiency Calculator

Calculate overall combined cycle gross and net electrical efficiency, net heat rate (BTU/kWh & kJ/kWh), steam turbine bottoming cycle MW, and auxiliary house load.

Gas Turbine Topping Cycle Ratings

Standard F-class ~ 38-40%, H-class ~ 42-44%

Steam Turbine & Auxiliary House Load

Typically 45% - 53%
Pumps, fans, cooling towers

Plant Overall Performance

Net Combined Cycle Efficiency (LHV)
--%
Net Heat Rate: -- BTU/kWh
Total Net Plant Output
-- MW
Gross: -- MW
Steam Turbine Output
-- MW
Bottoming cycle generation
Total Gas Turbine Power: -- MW
Efficiency Boost over Simple Cycle: +--% percentage points
Parasitic In-House Power: -- MW
CO2 Emissions Intensity: -- lb CO2 / MWh
--

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Frequently Asked Questions

Why do Combined Cycle Gas Turbine (CCGT) plants achieve 60%+ efficiency?

A simple-cycle gas turbine exhausts massive thermal energy at 950°F to 1100°F into the sky, limiting efficiency to 35-40%. By capturing this exhaust in a Heat Recovery Steam Generator (HRSG) to power a steam turbine bottoming cycle, an additional 50% electrical power is generated from the exact same fuel, pushing total efficiency past 60%.

What is the purpose of supplementary duct firing?

Supplementary duct burners inject and burn additional natural gas directly in the oxygen-rich gas turbine exhaust duct before entering the HRSG tube bundles. While it slightly degrades overall cycle efficiency, it rapidly increases steam production to boost steam turbine capacity during peak summer power demand.

What is the difference between a 1x1, 2x1, and 3x1 configuration?

The notation represents the ratio of gas turbines to steam turbines. A "2x1" configuration combines the exhaust from two identical gas turbines into two individual HRSGs (or one common boiler) that supply steam to a single large, highly efficient steam turbine generator.