The feed water heater shown in the...

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Question 1 of 205eccef9cbacbc34ba4d457a3

The feed water heater shown in the illustration was designed to maintain the required feed water outlet temperature with an approximate 10" Hg shell vacuum. If the shell vacuum is decreased to approximately 8" Hg vacuum, the __________. See illustration SG-0025.

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🔍 Key Concepts

• Feedwater heater shell vacuum and its relation to steam saturation temperature • How a change in saturation temperature affects heat transfer to the feedwater tubes • Impact of shell-side pressure/vacuum changes on overall plant efficiency and condenser operation

💭 Think About

• If the vacuum becomes weaker (from 10" Hg to 8" Hg), does the shell pressure go up or down, and what does that do to the saturation temperature of the steam in the heater? • If the shell-side steam temperature changes, how will that influence the final temperature of the feedwater leaving the heater, assuming flow rates stay about the same? • Which of the answer choices would logically follow from a small change in heater shell vacuum, and which ones are more related to the main condenser rather than this specific feedwater heater?

✅ Before You Answer

• Confirm how vacuum readings are defined: does a lower "inches of Hg vacuum" mean higher or lower absolute pressure? • Use a steam table to verify how saturation temperature changes with pressure in the range near condenser/feedwater heater pressures. • Check which options incorrectly link the feedwater heater shell vacuum to main condenser vacuum or condensate flow rate rather than to outlet temperature.

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