AIR CONDITIONING & REFRIGERATION

Class XI / 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

Thermodynamics and Its laws, meaning of Air Conditioning and Refrigeration, Brief history of Air Conditioning and Refrigeration, general safety, Application of Refrigeration, Concept of System, its boundary, and surroundings, Unit of Refrigeration, specification and uses of Refrigeration tools, Equipment, Instruments. Basic knowledge of heat energy. Comparison of heat engine, heat pump and refrigeration machine. Rating of Refrigeration Machines & Co-efficient of performance (C.O.P).
(i) Vapour Compression Cycle, Representation of Vapour Compression Cycle on temperature– entropy and pressure– enthalpy diagram, Effect of sub-cooling, Super heating, change in suction pressure and discharge pressure on coefficient of performance, Deviation of actual cycle from the theoretical cycle.
(ii) Working of a Domestic Refrigerator, water cooler & Deep Freezer, Refrigeration tools and materials, tubing, cutting, bending, flaring, joining, swaging, instruments and gauges.
(i) Meaning of Compressors, Types of compressor-reciprocating (semi-hermetic, hermetic and open types), rotary, centrifugal, and screwed types, working of compressor.
(ii) Compressor construction, valves, piston, connecting rods, crakshafts, seals, oil circulation, hermetic and semi-hermetic units, cooling of windings, Mufflers.
(i) Meaning of Alternating current, D.C. Current and difference between them, Voltage, phase difference. Knowledge of Ohm’s law and its representation on VI graph, Resistance and its unit, measurement of current, voltage and power.
(ii) Wiring circuit diagrams of Refrigerators and Air-Conditioners.
(i) Psychrometry, the composition of air, moist air, vapors and gases, specific humidity, absolute humidity, degree of saturation, relative humidity, Dry Bulb Temperature, Wet bulb Temperature, wet-bulb depression, Dew point temperature, dew point depression.
(ii) Human comfort, the concept of effective temperature, comfort zone.
(i) Applications of Air Conditioning, comfort, industrial and process Air Conditioning, the study of window type air conditioners, package units, and Central Air conditioning plants.
(ii) Measurement of air velocity and flow.