A steam plant is operating at 100% power when the atmospheric drain tank runs dry allowing a large air leakage into the main condenser. Which of the following will occur as a result of this air leakage?
⢠Effect of air leakage on condenser vacuum in a steam plant ⢠Relationship between condenser pressure, condensate temperature, and pump suction pressure ⢠How nonâcondensable gases (like air) change heat transfer and temperatures in the condenser
⢠When a lot of air enters the condenser, what happens to the condenser vacuum (pressure) and why? ⢠If the condenser vacuum gets worse, how does that affect the suction conditions at the condensate pump located at the hotwell (think about Net Positive Suction Head)? ⢠Would more air in the condenser tend to make the condensate and cooling water warmer, cooler, or unchanged, considering how it affects heat transfer efficiency?
⢠Identify whether increased air in the condenser makes the absolute pressure inside go up or down. ⢠Decide whether a loss of vacuum makes it easier or harder for the condensate pump to take suction from the hotwell. ⢠Compare each option to what would logically happen if condenser pressure rises and heat transfer becomes less efficient.
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