What Is The Principle Of The Engine Cooling System

The main work of the cooling system is to dissipate heat into the air to prevent the engine from overheating, but the cooling system has other important functions. The engine in the car runs best at an appropriate high temperature. If the engine gets cold, it will accelerate the wear of components, thus reducing the efficiency of the engine and emitting more pollutants. Therefore, another important role of the cooling system is to make the engine warm up as soon as possible and keep it constant temperature.
There are two types of automobile cooling systems: liquid cooling and air cooling. The cooling system of the liquid cooled vehicle circulates the liquid through the pipes and channels in the engine. When the liquid flows through the hot engine, it will absorb heat, thus reducing the temperature of the engine. After flowing through the engine, the liquid flows to the heat exchanger (or radiator), and the heat in the liquid is dissipated to the air through the heat exchanger. Air cooling Some early cars used air cooling technology, but modern cars almost do not use this method. This cooling method is not to circulate the liquid in the engine, but to dissipate heat from the cylinder through aluminum sheets attached to the surface of the engine block. A powerful fan blows air to these aluminum sheets to cool the engine. Because most cars use liquid cooling, there are a lot of pipes in the cooling system of cars.
The water pump circulates the liquid whenever the engine is running. It is similar to the centrifugal pump used in the automobile. When the pump is running, it transmits the liquid to the outside through centrifugal force and continuously pumps the liquid from the middle. The inlet of the pump is located near the center, so the liquid returned from the radiator can contact the pump blade. The pump blades deliver the liquid to the outside of the pump, where the liquid enters the engine. The liquid from the pump first flows through the engine block and cylinder head, then flows into the radiator, and finally returns to the pump. The engine block and cylinder head have many channels that are cast or machined to facilitate fluid flow.