![liquid cooling system in ic engines liquid cooling system in ic engines](https://d3i71xaburhd42.cloudfront.net/998c9d43ae10dd292b428d15f4e2a6f1027c9137/49-Figure13-1.png)
The cooling water system is dosed with anti-freeze in order to prevent the water freezing in sub-zero temperatures ( <0☌). When the cooling water is too hot, the thermostat directs it towards the radiator where the heat is dissipated in order that the engine does not overheat.Ĭlick here to learn how a thermostat works. When the cooling water (jacket water) is cold, the thermostat by-passes the radiator and the temperature of the cooling water gradually increases until it reaches the optimum temperature. Cooling water enters at the base of the sleeve and is discharged at the top.Ĭylinder Sleeve How do Engine Cooling Water Systems work? Combustion occurs within the cylinder liner ( combustion space), consequently, this space is the hottest part of the engine and must be correctly cooled. The cylinder sleeve ensures that cooling water is distributed evenly throughout the cylinder liner. In an automobile, the cooling medium is air, but larger engines often use a liquid as the cooling medium e.g. Its primary purpose is to ensure the engine does not overheat.Ī radiator dissipates heat and prevents the engine overheating.
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The thermostat can warm the engine quickly by by-passing the radiator, or, cool the engine by distributing cooling water to the radiator. Most pumps are coupled to the engine using a belt, gearor chain, but this depends upon the size of the engine very large engines use centrifugal pumps that are driven by electric motors.Ī thermostat regulates the cooling water temperature and thus the engine temperature. The pump is directly coupled to the engine crankshaftand thus its speed and output pressure is directly proportional to the engine’s speed. Cooling Water System ComponentsĪn engine cooling water system consists of a thermostat, cylinder sleeve, cooling water pump and a heat exchanger( radiator).Ī cooling water pump is required to circulate the cooling water throughout the engine. This makes the cooling water system design more flexible.Ī cooling water temperature of approximately 80☌ (176☏) and cooling water pressure of 3 bar ( 44 psi) is standard for most engines operating under load.Ĭooling water is sometimes referred to as ' jacket water' due to the 'jacket' of water surrounding the combustion space.
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Water can remove more heat than air and thus has a larger cooling capacity.Water is plentiful and can be easily acquired in most locations.Larger engines are water cooled for several reasons: Some engines are air cooled whilst others are water cooled.Īs a general rule, small engines (motorbike, lawnmower etc.) can be air cooled whilst all other types of engine must be water cooled. All internal combustion (IC) engines ( four stroke and two stroke) require some form of temperature control in order that they do not overheat and seize.