If a heat exchanger is designed to evaporate sea water using diesel engine jacket water as an evaporating medium, what statement is true?

Correct Answer: Option D — The sea water gains latent heat, and the diesel engine jacket water loses sensible heat.

In a freshwater distiller, the sea water gains latent heat to undergo a phase change from liquid to vapor. This energy is supplied by the diesel engine jacket water, which loses sensible heat as its temperature decreases, providing the necessary thermal energy to drive the evaporation process within the distiller.