‘From-and-at 100 °C’ evaporation - the canonical boiler capacity rating. m_eq = m·(h_g − h_fw)/2257.
Formula
$$ m_\text{eq} = m_\text{actual} \cdot \frac{h_g - h_{fw}}{2257} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $m_\text{actual}$ | Actual steam produced | kg/h | steam meter |
| $h_g$ | Enthalpy at outlet | kJ/kg | steam tables at P, superheat T |
| $h_{fw}$ | Feedwater enthalpy entering boiler | kJ/kg | feedwater tank T |
| $2257$ | h_fg at 100 °C | kJ/kg | IAPWS-IF97 constant |
Sources
- ASME PTC 4 - Fired Steam Generators.