What is removed via air ejectors or vacuum pumps from condensers operating under vacuum?

What is removed via air ejectors or vacuum pumps from condensers operating under vacuum?

• A. Noncondensable gases
• B. Condensate
• C. Steam
• D. Air

Answer: (A)

Maintaining a vacuum in a condenser relies on removing noncondensable gases that accumulate in the system. These gases hinder heat transfer by forming a thin layer at the heat‑transfer surface, which slows condensation. Air ejectors or vacuum pumps continuously draw off these noncondensables, lowering the pressure and allowing steam to condense more efficiently. Condensate is the liquid formed from the vapor and is handled separately, while steam is the vapor being condensed. Air is a noncondensable gas, but the removal target is noncondensable gases in general, not just a single gas.

Maintaining a vacuum in a condenser relies on removing noncondensable gases that accumulate in the system. These gases hinder heat transfer by forming a thin layer at the heat‑transfer surface, which slows condensation. Air ejectors or vacuum pumps continuously draw off these noncondensables, lowering the pressure and allowing steam to condense more efficiently. Condensate is the liquid formed from the vapor and is handled separately, while steam is the vapor being condensed. Air is a noncondensable gas, but the removal target is noncondensable gases in general, not just a single gas.