What type of cooling system is commonly used in diesel engines?

The commonly used cooling system in diesel engines is a closed-loop cooling system with a heat exchanger. This design efficiently manages the engine's operating temperature by circulating a coolant that absorbs heat from the engine and releases it through a heat exchanger, usually with water. The closed-loop system ensures that the coolant remains within the system, preventing contamination and allowing for better temperature control, as it can be easily monitored and serviced.

This design is particularly beneficial in maritime applications where diesel engines face varying loads and conditions. The heat exchanger allows for effective temperature regulation, ensuring that the engine operates within its optimal temperature range, thereby enhancing performance and longevity.

Other options, such as open-loop systems with radiators, may not provide the same level of efficiency and control, while air-cooled and liquid-cooled systems may be more suitable for specific applications but do not typically represent the standard for diesel engines in marine or automotive contexts.