AIR CONDITIONING & REFRIGERATION

Class XII / Subject Code - 827
After successfully completing these two years of Senior Secondary skill course, the student would have acquired relevant appropriate and adequate technical knowledge together with the professional skills and competencies in the field of Air conditioning and Refrigeration Technology so that they will be able to properly equipped to take up gainful employment in this sector.
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Course Objective

The knowledge of testing, faults, identification, and repair procedures with respect to refrigeration and air conditioning equipment.
The knowledge to prepare estimates for the cost of repair/ installation/ maintenance/ overhauling jobs.
=> Testing, fault location, and repairing of refrigeration and air-conditioning equipment. => Installing and commissioning refrigeration and air-conditioning equipment.
Carrying out preventive maintenance of refrigeration and air-conditioning equipment.
Dismantling, overhauling, and reassembling of refrigeration and air conditioning equipment.
Instructor
The relevant basic concepts and principles in basic science subjects (Physics, Chemistry and Mathematics) so that he/she is able to understand the different vocational subjects.
  • E-learning & Onsite classes
  • A 'Workshop' class
  • Industrial Visit
  • Certificate of Completion

Course Content

Psychrometric Processes – Sensible Cooling, Sensible Heating, Cooling with dehumidification, Cooling with adiabatic Humidification, Chemical-dehumidification, heating and humidification, Mixing of air- streams, Air Washers.
1. Principles of heat transfer, Conduction, Convection and Radiation. Properties of insulating materials..
2. Air Distribution, Systems of air distribution, Duct systems, cooling load and airquantities pressure inducts, (To be assessed through practical only) duct layout & construction..

1. Condensers, Air-cooled and water-cooled, Evaporative Condensers, Heat
Rejected in condensers, construction of condensers, Driers, receivers, Purging,
Cleaning of Condensers..
2. Refrigerant Controls, Types of expansion devices and sensible heat factor,
construction and operation of Automatic expansion valve, thermostatic expansion
valve, and capillary tube, low side float valve, High Side float valve. Solenoid
valves, testing and adjusting thermostatic expansion valves..
3. Evaporators, types of evaporators- Dry and flooded, Heat absorbed in
evaporators, water chillers, brine coolers, and Methods of defrosting..
4. Refrigerants, their properties and nomenclature- R11, R12, R22, R502, R113,
R114, R134A, ammonia, and carbon dioxide..

1. Refrigeration Controls, H.P. and L.P. cutouts, Oil Pressure failure safety switch..
2. Motor Starters, capacitors (To be assessed through practical only), Relays, overload protectors and servicing of motors..
1. Ice-Manufacture, cold-storage, Ice-Cream manufacture, Dairy refrigeration etc..
1. Air-Conditioning systems and equipment, classification of air-conditioning systems-all air systems, all water system types, Fans, Blowers, grills, resistors, filters, compressors, cooling coils, condensers Air-Handling Units, Fan coil Units, Central Air Conditioning plants. Ventilation Systems. .
2. Leak Detection, Pressure testing and charging. (To be assessed through practical only)..