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Note for IC Engine - ICE by SANTOSH KUMAR NAYAK

  • IC Engine - ICE
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ENGINE COOLING SYSTEM SKNAYAK

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ENGINE COOLING SYSTEM • What the cooling system does for an engine. 1. Although gasoline engines have improved a lot, they are still not very efficient at turning chemical energy into mechanical power. 2. Most of the energy in the gasoline (perhaps 70%) is converted into heat, and it is the job of the cooling system to take care of that heat. In fact, the cooling system on a car driving down the freeway dissipates enough heat to heat two average-sized houses! 3. The primary job of the cooling system is to keep the engine from overheating by transferring this heat to the air, but the cooling system also has several other important jobs. 4. The engine in your car runs best at a fairly high temperature. 5. When the engine is cold, components wear out faster, and the engine is less efficient and emits more pollution. 6. So another important job of the cooling system is to allow the engine to heat up as quickly as possible, and then to keep the engine at a constant temperature. SKNAYAK

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ENGINE COOLING SYSTEM • Characteristics of an efficient cooling system. • (i) It should be capable of removing about 30% of heat generated in the combustion chamber while maintaining the optimum temperature of the engine under all operating conditions of the engine. • (ii) It should removed heat at a faster rate when engine is hot. However, during starting of the engine the cooling should be minimum, so tat the working parts of the engine reach their operating temperatures in a short time. • Types of cooling systems. • 1.Liquid or indirect cooling system. • 2. Air or direct cooling system. SKNAYAK

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ENGINE COOLING SYSTEM • Liquid cooled system.(Water cooled) • In a liquid cooled system, heat is carried away by the use of a heat absorbing coolant that circulates through the engine, especially around the combustion chamber in the cylinder head area of the engine block. • The coolant is pumped through the engine, then after absorbing the heat of combustion is circulated to the radiator where the heat is transferred to the atmosphere. The cooled liquid is then transferred back into the engine to repeat the process. • Types of liquid cooled system • • • • • (i) Direct or non-return system (ii) Thermosyphon system (iii) Forced circulation cooling system (iv) Evaporative cooling system (v) Pressure cooling system SKNAYAK

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