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Combined Cycle Plant Performance — online

Is your combined-cycle plant delivering its design net output and heat rate, and how much of the gap is just the weather?

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Sheet

Yellow cells are inputs; orange cells are choices; blue cells choose the unit. Select or hover over an input to see its help in the box below the toolbar. The sheet is the same as the Excel tool (USD 49) — the Guide, method and references are in the Excel file.

Input help: select an input to see what it means and which units it takes.

What this combined cycle plant performance calculator does

Net output, net efficiency and heat rate of a gas turbine, HRSG and steam turbine plant: design, actual and proposed cases, ISO correction, loss breakdown and ambient what-if.

  • Net output and heat rate. Gross and net output, net efficiency and heat rate on an LHV or HHV basis, with the steam cycle share and the auxiliary load.
  • Design, actual and proposed. Three cases side by side with the differences: where the plant stands against its guarantee and what a planned change is worth.
  • Corrected to ISO conditions. Output, heat rate and efficiency at 15 °C, 101.325 kPa and 60 % RH, with generic coefficients or your own.
  • Steam turbine from the HRSG data. Measured output, or an estimate from HRSG steam flow, pressure and temperature, checked against the measurement.
  • Loss breakdown. Where the fuel heat goes: net output, auxiliaries, generators, stack, condenser and other, with an HRSG heat balance check.
  • Ambient what-if. Net output, heat rate and efficiency at other ambient temperatures, with ranked findings and three charts.

How it was checked

All 32 combinations of the five method selectors, 18 unit-system variants and 69 edge cases against an independent Python model (IAPWS-IF97 steam, species polynomials for the exhaust gas): net output, heat rate, efficiencies and corrected values within 0.005 %.

Related

Questions

Is the combined cycle plant performance calculator free?

You can enter and check all your data free. The full results, findings and printable sheet are unlocked with a 3-run pack (USD 9), a monthly subscription to all online tools (USD 15) or a yearly one (USD 99).

Are the results the same as the Excel tool?

Yes. The online tool runs the formulas of the Combined Cycle Plant Performance Excel workbook and was checked cell by cell against the Excel file.