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Vapor Release- Basic Energy Needed ??

Vapor Release- Basic Energy Needed ??

Vapor Release- Basic Energy Needed ??

(OP)
Looking for the BASIC equations for the fresh water from ocean water. This being the EXTRA energy, if any, needed to boil off a given quantity of water from salt water as compared to a fresh water system.

The standard steam tables do not reflect the extra energy to release the first 10% of the water. Is there any extra energy as the OCEAN water boils and pure water vapor is generated?

What is the extra barrier to hold back vapor generation?

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