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Ac & Refrigeration
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Air Conditioning and Refrigeration  

Air conditioning is defined as the simultaneous control of temperature, humidity, cleanliness and air motion. Air conditioning can refer to any form of cooling, heating, ventilation or disinfection that modifies the condition of air, typically for thermal comfort. An air conditioner is a major home appliance system or mechanism designed to change the air temperature and humidity within an area. Depending upon the requirement, air conditioning is divided into the summer air conditioning and the winter air conditioning.


The structural impact of an air conditioning unit will depend on the type and size of the unit and in addition to buildings, air conditioning can be used for many types of transportation, including motor-cars, buses, trains, ships, aircraft, and spacecraft. The graduate in this field involves theoretical and hands-on courses in the installation, basic design, maintenance and repair of air conditioning, and heating equipment.

Types of Air Conditioning

1. Window and through-wall

2. Evaporative coolers

3. Portable units

4. Heat pumps

Refrigeration is defined as the science of providing and maintaining temperature below that of surrounding and it is equivalent to production of cooling. Refrigeration has many applications, including household refrigerators, industrial freezers, cryogenics, and air conditioning. Two principle types of refrigeration plants found in industry are Vapour Compression Refrigeration (VCR) and Vapour Absorption Refrigeration (VAR).VCR uses mechanical energy as the driving force for refrigeration, while VAR uses thermal energy as the driving force for refrigeration. Graduate in this field involves theoretical and hands-on courses in the installation, basic design, maintenance, and repair of refrigeration, and heating equipment.

Methods of Refrigeration

1. Non-cyclic refrigeration

2. Cyclic refrigeration

3. Vapor-compression cycle

4. Vapor absorption cycle

5. Gas cycle

6. Thermoelectric refrigeration

7. Magnetic refrigeration


Duties of AC and Refrigeration Technician are

1. Follow blueprints or other design specifications to install or repair HVACR systems.

2. Install electrical wiring and controls and test for proper operation.

3. Inspect and maintain customers HVACR systems.

4. Test individual components to determine necessary repairs.

5. Repair or replace defective parts.



AC and Refrigeration technicians are employed in manufacturing industries. Air conditioning, and refrigeration mechanics and installers work in residential homes, schools, hospitals, office buildings, and factories. Graduates are involved in repairing, installing and maintaining the system.

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