How does a car radiator work?

by:DEFUS     2020-05-26
In order to avoid overheating of the engine, it is necessary to disperse the relevant parts around the engine combustion chamber, such as the engine cylinder head, cylinder liner, valve and the whole body. At present, the car's heat dissipation system mainly relies on the engine oil circulation to transfer the internal heat to the fuselage in time, and then dissipates heat through the wind, and the water circulation mainly dissipates heat through the radiator. That is to say, there are three ways to dissipate heat from the engine, namely water cooling, oil cooling and air cooling. The water cooling system is generally composed of radiators, thermostats, water pumps, cylinder water channels, cylinder head water channels, fans and other components. Air-cooled car radiator is an important heat dissipation assembly in the car cooling system. Generally, it can be divided into two types: longitudinal flow type and cross flow type according to the flow direction of the coolant. According to the structure of heat dissipation core, it can be divided into three types: tube heat dissipation core, tube belt type heat dissipation core and plate type heat dissipation core. According to the material, there are aluminum radiator (mostly used for passenger cars) and copper radiator (mostly used for large commercial vehicles). The working principle of the radiator: The cooling system of the water cooling system is composed of the water pump, radiator, cooling fan, thermostat, compensation water tank, engine body, water jacket and other components in the cylinder head. The water pipes and fins of the radiator are mostly made of aluminum. The aluminum water pipes are generally flat, and there are corrugated fins between the cooling pipes. Flat cooling tubes (similar to the louver layout) and corrugated fins increase the area through which air flows and are perpendicular to the air, which improves cooling efficiency and reduces wind resistance. When the cooling fluid flows and circulates in the radiator core, the air flows through the radiating core and the cooling pipe, which constantly takes away the heat of the circulating coolant of the engine heat, and the cooling fluid becomes cold. The cold air heats up because it absorbs the heat from the coolant. If the engine temperature rises enough to open the thermostat, the coolant will circulate, dissipating more heat from the coolant to the radiator ’s cooling duct, and the fan will also turn on to increase and help the air flow Continuous heat dissipation through the radiator. As far as the radiator is concerned, it is equivalent to a heat exchanger.
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