Steam Turbine Extraction and Backpressure Evaluation — online
Is your back-pressure or extraction turbine earning its keep, and what would a PRV or a condenser do instead?
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.
What this steam turbine extraction and backpressure evaluation calculator does
A steam turbine with up to two extraction points, expanded section by section, compared with a PRV letdown and a condensing last section for the same header steam.
- Up to two extractions. No, one or two extraction points; back-pressure or condensing; flow given at the inlet or at the exhaust.
- Section-by-section expansion. Enthalpy drop, power, outlet temperature and dryness of every section, with IAPWS-IF97 steam properties.
- Three-way comparison. Back-pressure, condensing last section and PRV letdown for the same header steam, with net energy cost per year.
- Power a PRV throws away. kW, MWh and money per year, with incremental heat rate and marginal cost of back-pressure and condensing power.
- Warnings. Wet exhaust and extraction steam, minimum flow, small pressure ratio, high condenser pressure, desuperheating spray water.
- What-if tables. Exhaust pressure, extraction pressure and extraction flow.
How it was checked
Every result and message cell of the online tool was compared with the Excel workbook recalculated independently, at the default inputs and at four sets of randomly changed inputs, with the displayed text identical. The method and sources are those of the Excel tool and its Guide.
Related
- Steam Turbine Extraction and Backpressure Evaluation Excel tool — USD 49, keep the workbook, its Guide and the report sheet.
- All online tools
Questions
Is the steam turbine extraction and backpressure evaluation 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 Steam Turbine Extraction and Backpressure Evaluation Excel workbook and was checked cell by cell against the Excel file.