Air Conditioning And Refrigeration – SS1, SS2 & SS3 Curriculum; Scheme of Work; Assessment Tests
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ASSURE Educational Services has put-together the scheme of work for Air Conditioning and Refrigeration – SS1, SS2 and SS3 based on the National Curriculum and the syllabus of WAEC and NECO. All the topics highlighted in the National Curriculum and the syllabus of WAEC and NECO have been accommodated in our Scheme of Work.
End of term Assessment Tests in SS1, SS2 and SS3 alongside Overall Assessment Tests are available. Schools may adopt our scheme of work because of its simplicity and ease of monitoring of academic activities.
The Scheme of Work stated below is inexhaustible. Schools are encouraged to input weeks and periods of completion of topics in accordance with the academic calendar, number of students and available classes.
SS1 Air Conditioning And Refrigeration (1st Term Scheme of Work)
|SS1||1st Term||Workshop Safety||Safety and first aid in the workshop.||(i) Workshop rules and regulations
(ii) Safety devices/equipment – helmet, goggles, safety boots, hand gloves, overall, apron sand bag, fire extinguishers, etc.
(iii). Accident: causes and prevention techniques.
(iv). First Aid – materials for First Aid, charts, posters and first aid box, etc.
(v). Application of first aid materials.
SS1 Air Conditioning And Refrigeration (2nd Term Scheme of Work)
|SS1||2nd Term||Energy, Matter and Power.||(a) Energy||(i). Definition of energy
(ii). The process of energy conversion electrical to mechanical, gas to vapour, mechanical to heat.
(iii). Meaning of internal energy.
(iv). Enthalpy of a fluid substance, its pressure, volume and temperature of internal energy.
(v). The ph diagram of refrigerant.
(vi). State of matter – solid, liquid, gas or vapour.
|(b) Nature of matter.||(i). Change of state of matter.
(ii). The meaning of power.
(iii) Calculation of power used by a compressor.
|(c) Power||Unit of power: watts and kilowatts
Unit of heat: joules and kilojoules.
SS1 Air Conditioning And Refrigeration (3rd Term Scheme of Work)
|SS1||3rd Term||Temperature and pressure.||(a) Temperature and its measurement||(i). Concept of temperature.
(ii). Different types of thermometer e.g. gas, resistance, liquid and thermocouple.3.3.
(iii). Temperature scale conversion
– centigrade to Fahrenheit
– Celsius to Kelvin
– Fahrenheit to rankine
(iv). International practical temperature
– The boiling point of oxygen 182.97ºC
– The triple point of water 0.01 ºC
– The boiling point of water 100 ºC
|(b) Pressure and its measurement||(i). Concept of pressure
(ii). Different types of pressure measuring devices e.g. barometer, manometer, bourdon tube gauge.
(iii). Pressure measurement
(iv). Uses of suction and high pressure gauges.
(v). Effects of temperature, pressure and volume in refrigeration and air conditioning systems.
(vi). Gas law, Boyles law, Charles law and Dalton’s law.
(vii). Calculations involving general gas law. Formulae:- P1V1 = P2V2,etc
(viii). Plotting various temperature scales
SS2 Air Conditioning And Refrigeration (1st Term Scheme of Work)
|SS2||1st Term||Refrigeration and air conditioning systems.||(a) Introduction to refrigeration.||(i). Refrigeration cycle – Evaporation, compression, condensation and expansion.
(ii). Layout diagram of refrigeration systems.
(iii). Types and applications of the various forms of refrigeration.
(iv). Principles of operation of forms of refrigeration system.
(v). Functions of the component and accessories e.g. relay, solenoid valves, capacitors and thermostat.
|(b) Refrigerants||(i). Definition and types of refrigerants
(ii). Chemical names and formulae.
(iii). Properties and uses of refrigerants.
(iv). Refrigerants flow controls e.g. TEV, AEV, capillary tube.
(v). Operations of refrigerant flow controls
|(c) Air-Conditioning processes||(i). Psychometric properties of air.
(ii). The processes of air conditioning: heating and cooling.
(iii). Latent and sensible heat, saturated and super-saturated vapour.
|Compressors, Condenses and Evaporators
||(a) Compressors||(i). Types of compressors
(ii). Construction of compressors.
(iii). Working principles of compressors.
|(b) Condensers||(i). Construction of condensers.
(ii). Calculation of heat load on condensers.
|(c) Evaporators||(i). Types and functions of liquid receiver and service valves.
(ii). Principle of operation of liquid receiver and service valves.
(iii). Types of evaporators.
(iv). Construction and services of evaporators.
(v). Working principles of evaporators.
(vi). Heat load estimates on evaporators.
SS2 Air Conditioning And Refrigeration (2nd Term Scheme of Work)
|SS2||2nd Term||Workshop practices.||(a) Basic tools used in refrigeration and air-conditioning workshops||(i). Basic tools – hacksaw, coil spring benders, reamers, tube cutters, etc.
(ii). Tools and procedures for servicing window unit air- conditioner.
|(b) Fault diagnosis and trouble shooting.||(i). Different methods of diagnosing faults systematic and observation.
(ii). Common faults in refrigeration systems and their symptoms – leakage, faulty units, faulty compressor, poor cooling and current leakage.
|(c) Maintenance and Testing||(i). Techniques of effective repairs in refrigeration and air- conditioning systems.
(ii). Techniques of trouble shooting in a given system.
(iii). Testing for leakages, polarity, insulation continuity, pressure and efficiency.
(iv). Maintenance of compressors, evaporators, motors, condensers, valves, accumulators and contractors.
|Installation processes||(a) Piping, Ducting and Trunking||(i). Concept of piping, ducting and trunking.
(ii). Piping a condenser and an evaporator.
(iii). Ducting, trunking and installation of air-conditioners.
(iv). Piping, ducting and trunking tools – mallet hammer, flaring tools, silver tape, dot-punch, bending spring, amaflex, hacksaw, PVC pipes.
|(b) Motors and generators||(i). Types, functions, operations and application of motors and generators.
(ii). Installation procedures for motors and generators.
(iii). Maintenance of motors and generators in a refrigeration system.
|(c) Cold room||(i). Working principles of cold room.
(ii). Cold room installation procedures.
(iii). Factors affecting cold room operations.
SS2 Air Conditioning And Refrigeration (3rd Term Scheme of Work)
|SS2||3rd Term||Insulation processes||Insulation of refrigeration and air-conditioning system.||(i). Importance of insulation of refrigeration and air-conditioning systems.
(ii). Types of insulating materials – glasswool, fibre glass, polysterene foam, wood, bitumen, ceramic, etc.
(iii). Functions and properties of insulation materials.
(iv). Procedure for insulating refrigeration and air- conditioning systems.
|Entrepreneurship||(a) Business concept.||(i). Concept of business enterprise and types of businesses – sole proprietorship, partnership, limited liability, etc.
(ii). Sources of finance – loan, mortgage, shares, overdrafts, savings, etc.
|(b) Marketing||(i). Types, functions of marketing styles.
(ii). Meaningful marketing at the least cost.
(iii). Marketing protocol and cost.
|(c) Accounting||(i). Principles of Accounting.
(ii). The concept of business as a separate entity.
(iii). Ledger, trial balance and balance sheet.
NB: SS3 Air Conditioning And Refrigeration Scheme of Work – Practical Class ONLY
|SS3||1 Identification and operation of various types of fire extinguishers
2. Demonstration of conversion of mechanical to heat energy e.g. rubbing of palms.
3. Demonstrate the conversion of ice block to water.
4. Demonstration of the use of a barometer.
5. Demonstrate how suction and high pressure gauges are used to determine the performance of a refrigerant.
6. Identification of refrigerant by cylinder colours.
7. Demonstration of air conditioning principle by sling psychometer.
8 Demonstration of the difference between latent and sensible heat by use of methylated spirit on human skin.
9. Demonstrate how to service a condenser.
10. Demonstrate how to service evaporators
11. Servicing of a window air-conditioner.
12. Demonstrate how to test for leakages, polarity continuity and efficiency.
13. Demonstrate how to repair faults in compressors, evaporators, motor and condensers.
14. Installation of a split air-conditioner.
15 Servicing of motors and generators.
16. Carry out a commercial marketing survey to set up refrigeration and air-conditioning business.
17. Preparation of ledger and balance sheet.
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