Lesson Notes By Weeks and Term - Senior Secondary 3

Additives and types of cooling system II

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TERM – 2ND TERM

WEEK SIX

Class: Senior Secondary School 3

Age: 17 years

Duration: 40 minutes of 5 periods each

Date:

Subject: AUTO MECHANICAL

Topic: ADDITIVES AND TYPES OF COOLING SYSTEM II

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

I.) Define cooling system

II.) Identify the types of cooling system

III.) Differentiate between air cooling and liquid cooling

IV.) Mention the importance of cooling system

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

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

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

PRESENTATION

TEACHER’S ACTIVITY

STUDENT’S

ACTIVITY

STEP 1

INTRODUCTION

The teacher explains the meaning of cooling system and identify the types of cooling system

Students listens attentively to the teacher                                                                          

STEP 2

EXPLANATION

Teacher discusses the differences between air cooling and liquid cooling.

Teacher explains the importance of the cooling system.

Students exhibit attentiveness and active engagement

STEP 3

NOTE TAKING

The teacher writes a summarized

note on the board

The students

copy the note in

their books

 

NOTE

ADDITIVES AND TYPES OF COOLING SYSTEM II

Cooling System

The cooling system is a vital component of a vehicle's engine that helps regulate engine temperature by dissipating heat generated during combustion. It prevents the engine from overheating and ensures optimal operating conditions for efficient performance and longevity.

Types of Cooling Systems

  1. Liquid Cooling System: Uses a liquid coolant (usually a mixture of water and antifreeze) to absorb heat from the engine. The coolant circulates through channels or passages in the engine block and cylinder head, absorbing heat from the combustion process.

The heated coolant is then pumped to the radiator, where it releases heat to the surrounding air before returning to the engine. 

  1. Air Cooling System: Relies on airflow over fins or cooling fins attached to the engine's exterior to dissipate heat. No liquid coolant is used; instead, air is used to directly cool the engine components.

Commonly found in small engines, motorcycles, and older vehicles, especially those with air-cooled engines like the Volkswagen Beetle or older Porsche models.

Difference between Air Cooling and Liquid Cooling

Air Cooling

Liquid Cooling

No liquid coolant used

Uses a liquid coolant (e.g., water and antifreeze mixture)

Relies on airflow over fins or cooling fins attached to the engine's exterior.

Liquid coolant absorbs heat from the engine and releases it to the surrounding air through the radiator.

Less efficient in dissipating heat, especially at high engine loads or temperatures

More efficient in regulating engine temperature, even under heavy loads or extreme conditions.

Generally requires less maintenance due to fewer components and no coolant to change.

Requires regular maintenance, including coolant flushes and checks for leaks or corrosion.

 

Importance of Cooling System

  1. Prevents Overheating: The cooling system prevents the engine from overheating by dissipating heat generated during combustion, ensuring optimal operating temperatures.
  2. Maintains Engine Efficiency: By regulating engine temperature, the cooling system helps maintain optimal combustion conditions, improving fuel efficiency and engine performance.
  3. Prevents Engine Damage: Overheating can cause severe damage to engine components such as cylinders, pistons, and gaskets. The cooling system prevents such damage by keeping temperatures within safe limits.
  4. Increases Engine Longevity: Proper cooling helps extend the life of the engine by reducing wear on components and preventing premature failure due to heat-related issues.
  5. Ensures Passenger Comfort: A properly functioning cooling system helps maintain a comfortable interior temperature by preventing overheating and ensuring proper operation of the vehicle's heating and air conditioning systems.

EVALUATION: 1. What is cooling system

  1. Differentiate between air cooling and liquid cooling system
  2. Mention 4 importance of the cooling system.

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively