Lesson Notes By Weeks and Term - Senior Secondary 1

TERM – 2^ND TERM

WEEK TEN

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes of 5 periods each

Date:

Subject: AUTO MECHANICAL

Topic: COOLING SYSTEM II

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

I.) Identify the types of cooling system

II.) Identify the components of a liquid cooling system in a vehicle

III.) State the functions of the components

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures,

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

NOTE

COOLING SYSTEM II

Types of cooling systems

1. Liquid Cooling System: This is the most common type of cooling system in vehicles. It circulates a liquid coolant (usually a mixture of water and antifreeze) through the engine and radiator to dissipate heat.
2. Air Cooling System: Some vehicles, particularly motorcycles and older cars, use an air cooling system instead of a liquid cooling system. In an air cooling system, fins or cooling vanes on the engine's exterior surface increase the surface area, allowing air to pass over and carry away heat.

Components of a liquid cooling system in a vehicle

1. Radiator: The radiator is a heat exchanger that removes heat from the coolant circulating through it. It consists of tubes and fins that facilitate heat transfer to the surrounding air.
2. Water Pump: The water pump circulates coolant through the engine and radiator, ensuring proper coolant flow and heat dissipation.
3. Thermostat: The thermostat regulates the flow of coolant to the radiator based on engine temperature. It helps maintain the engine at an optimal operating temperature by opening and closing the coolant passages as needed.
4. Cooling Fan: The cooling fan helps to increase airflow through the radiator, especially during low-speed or stationary operation when natural airflow is insufficient.
5. Coolant Reservoir: Also known as the expansion tank or overflow tank, the coolant reservoir stores excess coolant and allows for expansion and contraction of the coolant as temperature changes occur.
6. Hoses: Hoses connect the various components of the cooling system, allowing coolant to flow between the engine, radiator, water pump, and coolant reservoir.

Functions of the components

Sure, here are the functions of the components of a liquid cooling system in a vehicle:

1. Radiator: The radiator is responsible for transferring heat from the coolant to the surrounding air. It consists of tubes and fins that increase the surface area for heat dissipation.
2. Water Pump: The water pump circulates coolant throughout the engine and radiator. It ensures that coolant flows consistently to absorb heat from the engine and then dissipate it in the radiator.
3. Thermostat: The thermostat regulates the flow of coolant between the engine and radiator based on engine temperature. It opens and closes to maintain the engine at its optimal operating temperature, ensuring efficient combustion and performance.
4. Cooling Fan: The cooling fan helps increase airflow through the radiator, especially during low-speed or stationary operation when natural airflow is insufficient. It helps dissipate heat from the coolant by forcing air over the radiator fins.
5. Coolant Reservoir: The coolant reservoir serves as a storage tank for excess coolant and allows for expansion and contraction of the coolant as temperature changes occur. It helps maintain the proper coolant level in the system.
6. Hoses: Hoses connect the various components of the cooling system, allowing coolant to flow between the engine, radiator, water pump, and coolant reservoir. They ensure proper circulation of coolant throughout the system.

EVALUATION: 1. Identify and discuss the 2 types of cooling system

2. State 4 components of cooling system
3. Discuss the functions of each components of the cooling system

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively