Operating a steam turbine propulsion unit at...

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Question 1 of 2066636ef128f7522a1c521737

Operating a steam turbine propulsion unit at medium-speed, in an area with extremely cold sea water and the main circulating pump providing full cooling water flow to the condenser will result in __________.

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Question 1 of 20

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🔍 Key Concepts

• How condenser vacuum is actually limited in a steam plant (steam temperature vs. air leakage/air partial pressure) • The meaning of condensate depression and what happens if condensate is cooled well below saturation temperature • How very cold seawater and maximum circulating flow affect plant efficiency and gas (air) behavior in the condenser

💭 Think About

• Ask yourself whether making the condensate much colder than its saturation temperature really improves Rankine cycle efficiency, or whether it creates extra, useless cooling that must be undone later in the feed system • Think about what mostly controls the effectiveness of the air ejectors: is it having a higher vacuum, or the amount and location of non‑condensable gases in the condenser? • Consider whether very efficient cooling (cold seawater, full flow) tends to reduce or increase the amount of dissolved air and aeration problems in the condensate

✅ Before You Answer

• Be clear on the definition of condensate depression (difference between saturation temperature at condenser pressure and actual condensate temperature) and whether more depression is beneficial or wasteful • Check whether higher attainable vacuum in practice is mainly limited by cooling water temperature or by air in‑leakage/air removal capacity • Verify whether cold condensate holds more or less dissolved air compared to warmer condensate, and how that would influence aeration and the air ejector load

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