Design Considerations of Bare Tube Low Pressure Boiler EconomizerPressure and Temperature ConstraintsLower Pressure: Operates with feedwater pressures typically <2.5 MPa (vs. high-pressure economizers at 10–15 MPa), matching the low-pressure feedwater circuit (e.g., preheating condensate or deaerato

Advantages of Bare Tube Low Pressure Boiler EconomizerHeat Transfer PerformanceModerate Efficiency: Bare tubes have lower heat transfer coefficients (typically 30–60 W/(m²·K) for flue gas-side) compared to finned tubes (80–150 W/(m²·K)), but this is acceptable in low-temperature, low-heat-flux zones

Economizer Lower Pressure Tube Bundle with Bare Tube