Rabu, 24 November 2021
COOLING SYSTEM ON MOTORCYCLE
the engine also has a cooling system, friend, of course this system serves to cool your vehicle engine, this time we will discuss Cooling System.
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| sumber : pinterest.com |
1. Cooling System Function
The heat generated by the combustion process in the motor is converted into motion energy. But in reality only part of the heat is utilized effectively. The heat absorbed by the motor must be immediately discharged to the outside air, otherwise the motor will overheat and the motor components will wear out quickly. For this reason, the motor is equipped with a cooling system that functions to prevent excessive heat. In a gasoline engine, only about 23% of the heat energy from the combustion of fuel in the cylinder is used effectively as power. The rest is wasted in several forms as shown in the image on the following page.
In the picture above it appears that of the total energy produced by the combustion process, only 25% is used for effective work. The heat lost with the exhaust gases is approximately 34%, the heat lost due to the cooling process is 32%, due to pumping 3%, and due to friction 6%.
Broadly speaking, the function of the cooling system on the motor is as follows:
- To reduce motor heat. The heat generated by the combustion of a mixture of air and fuel can reach OPKR-0-012B
- around 2500° C. This high enough heat can melt metal or other components used in the motor, so that if the motor is not equipped with a cooling system it can damage the motor components.
- To maintain the motor temperature is always at the most efficient working temperature in various conditions. Generally, the working temperature of the motor is between 82 to 99° C. When the motor components reach that temperature, the motor components will expand so that the clearance on each component becomes correct. Besides, the work of the motor is maximized and the exhaust emissions generated are minimized.
- To accelerate the motor to reach its working temperature with the aim of preventing excessive wear, poor motor performance, excessive exhaust emissions. This can happen because when the motor is working at cold temperatures, the mixture of fuel and air that enters the cylinder does not match the mixture that can produce maximum motor work. The cold cylinder wall temperature results in incomplete combustion so that the exhaust gases contain a lot of emissions that are harmful to humans. Therefore, when the motor is running, the working temperature must be reached immediately. This will be fulfilled if the motor has a cooling system equipped with components that allow this to happen.
- To heat the space in the passenger compartment, especially in countries that experience winter.
2. Kinds of Cooling System
OPKR-0-012B 11
There are two types of cooling systems commonly used in motorcycles, namely air cooling systems and water cooling systems.
- Air Conditioning System, In this system, the heat generated from the combustion of fuel and air in the cylinder is partially propagated out through the cooling fins mounted on the outside of the cylinder and the combustion chamber. The heat is then absorbed by the outside air whose temperature is much lower than. cooling fin temperature. For the engine area with a high temperature, namely around the combustion chamber, cooling fins are given which is longer than in the area around the cylinder. Air that absorbs heat from cooling fins must be in the form of a stream or the air must flow so that the temperature around the fins remains low so that heat absorption continues perfectly. The speed of this air flow must be proportional to the rotational speed of the engine so that the ideal engine temperature can be achieved so that cooling can take place perfectly.
- Water Cooling System, In this system, the heat from the combustion process of fuel and air in the combustion chamber and cylinder is partially absorbed by the cooling water after passing through the cylinder wall and combustion chamber. Therefore, on the outside of the cylinder wall and combustion chamber, water jackets are made. The heat absorbed by the cooling water in the water jacket will then cause the temperature of the cooling water to rise. If the cooling water remains in the water mantle, the water will tend to boil and evaporate. This can be avoided by replacing the water with cold water while the hot water must be drained out of the coat, in other words, it must circulate. There are two kinds of water circulation, namely natural circulation or thermo siphon and pressure circulation.
The water cooling system is equipped with a water jacket, water pump, radiator, thermostat, fan, and rubber hose. Each component of the cooling system will be discussed in a separate description. When the engine is still cold, water only circulates around the engine because the thermostat is still closed. In this case the thermostat serves to open and close the water channel from the engine to the radiator. The water gets pressure from the water pump, but the pressure is not able to push the thermostat open. To prevent excessive pressure due to the pumping process, the cooling system is equipped with a by-pass channel, so that pressurized water will return through the by-pass channel.