Electrical Engineering Assignment Sample
Q1:
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Effects of heat, including changes in temperature, color, state and volume of substances Write your answer using 100 – 150 words. |
Heat transfer, including conduction, convection and radiation. Write your answer using 100 – 150 words. |
Air-cooled systems. Write your answer using 50 – 100 words. |
Liquid-cooled systems. Write your answer using 50 – 100 words. |
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Effects of heat Temperature Changes: With increase in heat the substances change their consistency and expand or become more liquid. It can also change the state of the substance if the heat is high.
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Heat transfer Conduction – with conduction the heat moves through direct contact from the hotter parts to the cooler parts of the metal. This is usually seen in the metal parts of the cooling system. |
Air cooled system uses airflow to reduce the heat. Natural air flow or fans are used to move the hot air from the engine to cooling fans which reduces the heat of the system and keeps the engine temperature to balance for proper working and safety of the system and machine. |
Liquid cooled system is when liquids like coolants are used to reduce the temperature of the engine. Here the heat is taken as coolant takes the heat from engine and then air blows on the coolant reducing its temperature, than the coolant returns to the engine marinating the temperature of the engine. |
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Q1: Describe the purpose and operation of the following components of cooling systems components, including:
Answer :| Engine coolant types and composition | Water pumps | Thermostats and bypass systems |
Mechanical, hydraulic, and electric fans |
Radiators | Pressure caps | Drive belts | Expansion tanks | Heat exchangers | Temperature sensors and gauges. | Hoses | |||||||||||
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Purpose –Coolant protects the engine from freezing or corrosion and they also help to maintain the optimal temperature of the engine. Operations – coolant is a mixture of water and antifreeze which takes the heat from the engine to cool it and release it with radiator. |
Purpose – to circulate coolant in engine and cooling system Operations – the pump pushes the coolant to engine and radiator and reduces the temperature of the parts. |
Purpose – To regulate temperature by controlling flow of coolant. Operations – When engine is cold the thermostat is closed and to allows the heat to increase. When engine is hot the Thermostats and bypass systems opens to keep the temperature to cool down with coolant. |
Purpose – to cool the heat from the radiator and cooling system Operations – mechanical fans are connected from engine and they increase the air flow directly when engine heats. |
Purpose – cools the coolant Operations – coolant when comes to radiator, air is blown on it which cools the liquid before giving it back to engine. |
Purpose – to maintain pressure of cooling system Operations – They allow the pressure to be released and trapped and prevents from increased temperature of the coolant to prevent any damage to the system. |
Purpose – provide power to engine components Operations – Drive belt connects engine crankshaft to all small parts of the engine like water pumps and fans and powers them to work when required by the engine. |
Purpose – allows coolant to expand Operations – expansion tanks is where the coolant expands after it has high temperature and till it cools down expansion tank contains it. |
Purpose – transfer heat between two materials Operations – when parts use high temperature it makes coolant to get warm and heat for working, then the coolant transfers the heat to other parts to keep the system working. |
Purpose – they monitor engine temperature Operations – A temperature sensor notes the increase and decrease of the engine temperature and then sends data to the gauges which shows it on the driver dashboard. |
Purpose – it transfers coolant between components Operations – hoses connect all engine parts and transfers coolants from one place to another. It helps to move the liquid in various parts for cooling the system. |