Boiler Efficiency Calculator

Inputs

Fuel GCV (kCal/kg)

Steam Generation (TPH)

Steam Pressure (bar)

Steam Temperature (°C)

Feed Water Temperature (°C)

Fuel Consumption (kg/hr)

No fuel meter? Enter known/assumed overall efficiency instead

Flue Gas O₂ (%)

Flue Gas Temperature (°C)

Ambient Temperature (°C)

Ash Content in Fuel (%)

Direct Method Efficiency - %

Indirect Method Efficiency - %

Enthalpy rise of steam over feed - kCal/kg

Estimated Saturation Temp @ Pressure - °C

Dry Flue Gas Loss - %

Loss due to H₂ in Fuel (assumed) 2.00 %

Moisture in Fuel Loss (assumed) 1.00 %

Unburnt Carbon (Ash) Loss - %

Radiation & Other Loss 2.00 %

Direct Method: Efficiency = (Steam mass × (h_steam − h_feed)) ÷ (Fuel mass × GCV).
Steam Enthalpy : If T_steam > T_sat, superheat is added with c_p,sh ≈ 0.48 kCal/kg·°C. h_feed ≈ 1.0×T_feed.
Indirect Method: Efficiency = 100 − Σlosses. Dry flue gas loss uses a practical O₂‑based shortcut (see code), H₂ loss assumed 2%, moisture 1%, ash loss = 0.2 × Ash%, radiation fixed 2%.
No fuel meter mode: Provide a known/assumed overall efficiency to back‑calculate fuel consumption: Fuel ≈ (Steam mass × (h_steam − h_feed)) ÷ (GCV × η).
Results are engineering estimates. For precision, use lab fuel analysis & detailed stoichiometry/steam tables.