207. What occurs within the tubes of the device labeled «23» shown in the illustration

The feedwater flowing through the inside of the tubes is being heated by the jacket water on the outside of the tubes.
The heat from the jacket water passing within the tubes is being transferred to the feedwater on the outside of the tubes.
The heat of combustion from the engine is being transferred azeotropically, adding latent heat to the entering jacket water.
The heat being transferred is subliminal; therefore expansion is taking place within the tubes.

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