The operation of the lube oil cooler, shown in the illustration as item No.4, will be characterized by which of the following statements? Illustration MO-0111

Correct Answer: Option B — The temperature of the sea water entering the cooler will be higher when operating with the distiller on line.

When the distiller is online, it utilizes heat from the engine cooling system. This increased thermal load on the cooling water circuit reduces the cooling capacity available for the lube oil cooler. Consequently, the sea water temperature entering the lube oil cooler rises, as the system's overall heat rejection demand increases.