Air forms non-condensable gas that occupies pipeline space, hinders steam condensation and reduces heat exchange efficiency, requiring higher energy consumption for heating compensation.

Negative pressure air intake disrupts the steady vacuum state and raises the boiling point, consuming more thermal energy for the same evaporation capacity.

Non-condensable gas increases the pumping load of the vacuum pump, boosting motor work and corresponding power consumption.

Oxygen triggers slight corrosion and scaling inside pipelines, raising thermal resistance of pipe walls and continuously increasing heat exchange loss.

Air intake disturbs gas-liquid balance and intensifies entrainment, bringing extra energy consumption for system treatment.