Boiler Efficiency - Direct Method
Direct (input-output) efficiency: useful heat in steam vs. fuel energy. Fast and accurate when steam flow and fuel flow are metered.
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Formula, assumptions, and limits
| Symbol | Meaning | Unit |
|---|---|---|
| Steam produced | kg/h | |
| Steam enthalpy | kJ/kg | |
| Feedwater enthalpy | kJ/kg | |
| Fuel consumed | kg/h | |
| Lower calorific value | kJ/kg | |
| Direct efficiency |
Source: ASME PTC 4 - Fired Steam Generators
In short
Direct (input-output) efficiency: useful heat in steam vs.