Thermodynamics
Boiler Efficiency Simulator
Examine steam boiler thermal efficiency using the input-output method. Adjust generation rates, fuel flow, water and steam enthalpy, or swap fuel calorific presets.
Method
Direct Method
ASME PTC 4.1
Fuel Type
Fuel Oil
GCV = 42000 kJ/kg
Output
CSV
Export ready
Parameters
Fuel Presets
Animate steam sweep
Boiler Performance Model
Heat Output (Steam absorbed)
Q_out = ms × (hs - hw) kJ/h
Heat Input (Fuel combusted)
Q_in = mf × GCV kJ/h
Direct Efficiency
η = (Q_out / Q_in) × 100 %
At current flow rates, heat output is 3292 kW out of 4667 kW fuel energy input.
ASME PTC 4.1 direct calculation assumes negligible radiation/convection losses.
Boiler Flow Diagram
Thermal Efficiency
70.5%
Direct Calculation
Heat Input (Fuel)
4667kW
Heat Output (Steam)
3292kW
Steam-Fuel Ratio
12.50kg/kg
kg steam produced per kg fuel
Efficiency & Heat Output vs Steam Rate
Performance Sweep Nodes
| Steam Flow (kg/h) | Efficiency (%) | Heat Output (kW) | Steam/Fuel Ratio |
|---|---|---|---|
| 1000 kg/h | 14.1% | 658 kW | 2.50 |
| 2000 kg/h | 28.2% | 1317 kW | 5.00 |
| 3000 kg/h | 42.3% | 1975 kW | 7.50 |
| 4000 kg/h | 56.4% | 2633 kW | 10.00 |
| 5000 kg/h | 70.5% | 3292 kW | 12.50 |
| 6000 kg/h | 84.6% | 3950 kW | 15.00 |
| 7000 kg/h | 98.8% | 4608 kW | 17.50 |
| 8000 kg/h | 112.9% | 5267 kW | 20.00 |
| 9000 kg/h | 127.0% | 5925 kW | 22.50 |
| 10000 kg/h | 141.1% | 6583 kW | 25.00 |
| 11000 kg/h | 155.2% | 7242 kW | 27.50 |
| 12000 kg/h | 169.3% | 7900 kW | 30.00 |
| 13000 kg/h | 183.4% | 8558 kW | 32.50 |
| 14000 kg/h | 197.5% | 9217 kW | 35.00 |
| 15000 kg/h | 211.6% | 9875 kW | 37.50 |
| 16000 kg/h | 225.7% | 10533 kW | 40.00 |
| 17000 kg/h | 239.8% | 11192 kW | 42.50 |
| 18000 kg/h | 253.9% | 11850 kW | 45.00 |
| 19000 kg/h | 268.0% | 12508 kW | 47.50 |
| 20000 kg/h | 282.1% | 13167 kW | 50.00 |