Discussion
Condensate returned to the boiler house saves energy chiefly because it is
Answer: C
Correct answer: hot and almost free of dissolved solids
Condensate returns at close to boiling, so far less fuel is needed to bring it back to steam, and it is essentially distilled water, so it dilutes the drum and lets the blowdown rate fall. Those two effects compound: the returned condensate saves sensible heat directly and saves more by displacing blowdown.
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