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Radiator (74)

Radiators are heat exchangers used to transfer thermal energy from one medium to another for the purpose of cooling and heating. The majority of radiators are constructed to function in automobiles, buildings, and electronics.

Radiator (engine cooling)
Radiators are used for cooling internal combustion engines, chiefly in automobiles

To cool down the engine, a coolant is passed through the engine block where it is heated, is fed into the inlet tank of the radiator, which distributes the coolant across the radiator core, then cools down as it circulates through the radiator tubes to the opposite tank, the cold coolant is fed back to the engine, and the cycle repeats.

This coolant is usually water-based, with addition of glycols to prevent freezing and other additives to limit corrosion, erosion and cavitation, but may also be an oil. The first engines used Thermosyphon to circulate the coolant, however nowadays all engines but the smallest ones use a pump..

Up to the 1980s, radiator cores were often made of a copper (for fins) and brass .Starting in the 1970s, use of aluminium has increased, to take over the vast majority of vehicular applications.

Since air has a lower heat capacity and density than liquid coolants, a fairly large volume flow rate (relative to the coolant's) must be blown through the radiator core to capture the heat from the coolant. Radiators often have one or more fans that blow air through the radiator. To save fan power consumption in vehicles, radiators are often behind the grille at the front end of a vehicle. Ram air can give a portion or all of the necessary cooling air flow, and the fan remains disengaged.

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