Boiler Blowdown Energy Scenario Calculator

How the boiler blowdown energy scenario calculator works

Thermal energy above the makeup state is blowdown kilograms × (blowdown enthalpy − makeup enthalpy) ÷ 3,600, giving kWh from kJ. Divide that heat by the entered efficiency fraction for a fuel-input equivalent. Extend fuel input at the entered rate for the cost equivalent.

Both enthalpies must be reviewed at the intended states and use the same datum; the blowdown value must be at least makeup value in this heat-loss scope. No blowdown quantity, pressure, chemistry target, safe operating setting or recovery equipment is recommended. This is a measured-stream scenario, not a control model.

Quantities use the stated units and finite bounded inputs. Whole purchases round up under the documented model; cost components round half-up to cents before totals are summed. Undefined ratios stay unavailable. π and logarithms use normal numeric precision. Display rounding does not alter the entered assumptions.

Worked example

1,000 kg with an entered 700 kJ/kg enthalpy rise contains about 194.444 kWh. At 80% efficiency this is 243.056 kWh fuel equivalent. An illustrative 0.08/kWh gives 19.44. Doubling mass gives 38.89 after extending the unrounded energy and rounding once.

Sources and assumptions

The source material explains the underlying calculation or pricing structure. Entered prices, costs, schedules and scenario choices are your assumptions; this tool does not obtain supplier quotes or predict actual results.

• DOE Improving Steam System Performance sourcebook