Diploma Refrigeration and Air conditioning Question papers and answer key
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Diploma Refrigeration and Air Conditioning Syllabus
Unit 1 REFRIGERATION SYSTEM AND REFRIGERATION EQUIPMENTS
Thermodynamic state of a pure substance, modes of heat transfer –laws of heat transfer – mechanisms of production of cold – unit of refrigeration –types of refrigeration reversed Carnot cycle – C.O.P of heat engine-heat pumprefrigerating machine – principle of working of open and closed air system of refrigeration – advantages and disadvantages – and its application of air cycleproblems Compressor – principle of working and constructional details of reciprocating and rotary compressors, hermetically and semi hermetically sealed compressors- condensers-principle of working and constructional details of air cooled and water cooled condensers, evaporative condensers- advantages and disadvantages – natural and forced draught cooling towers.
Evaporators- natural circulation and forced circulation type – principle of working constructional details.
Unit 2 VAPOUR COMPRESSION REFRIGERATION SYSTEM ,VAPOUR ABSORPTION REFRIGERATION SYSTEM AND CRYOGENIC REFRIGERATION SYSTEMS
Principle of working of vapour compression system – analysis of vapour compression cycle using T-s diagram and p-H diagram- refrigerating effectcompression work – C.O.P – effect of superheating and under cooling – effect of evaporative pressure and condenser pressure-problems – liquid vapour refrigeration heat exchangers – advantages and disadvantages of superheating and under cooling –use of flash chamber and accumulator. Simple absorption system – Electrolux system – solar absorption refrigeration system- absorption system comparison with mechanical refrigeration system. Refrigerators for above 2 K- Philips Refrigerator–Giffered McMohan
refrigerator- refrigerators for below 2 K – Magnetic refrigeration system
Unit 3 REFRIGERATION FLOW CONTROLS, REFRIGERANTS AND LUBRICANTS AND APPLICATIONS OF REFRIGERATION
Capillary tube-automatic expansion valve-thermostatic expansion valve electronic expansion valve-solenoid valve-evaporator pressure regulator – suction pressure regulator-classification of refrigerants-selection of a refrigerant-properties and applications of following refrigerants SO2 , CH4,F22,and NH3–CFCs refrigerants- equivalent of CFCs refrigerants (R-123a,R143a,R-69S)- blends of refrigerants(R400 and R500 Series) – lubricants used in refrigeration and their applications. Slow freezing –quick freezing- cold storage-frozen storage-freeze drying –dairy refrigeration –ice cream cabinets-ice making – water cooler, milk cooler, bottle cooler-frost free refrigeration.
Unit 4 PSYCHOMETRICS AND COMFORT AIR CONDITIONING SYSTEMS
Psychrometry properties – adiabatic saturation of air by evaporation of water psychometric chart and its uses – psychometric processes – sensible heating and cooling – humidifying and heating – dehumidifying and cooling – adiabatic cooling with humidification – total heating or cooling processes -sensible heat factor – by pass factor – adiabatic mixing – evaporative cooling – problems – governing optimum effective temperature – comfort chart-design consideration. Equipment for air conditioning and insulation factors – air purification – temperature control – humidity control – dry and wet filters- centrifugal dust collector – air washer humidifier – dehumidifier – fans and blowers – grills and registers – summer and winter air conditioning, window and split air conditioners –– properties of ideal insulator, types of insulating materials
Unit – 5 COOLING LOAD CALCULATIONS AND DUCT DESIGN , ENERGY CONSERVATION TECHNIQUES
Different heat sources – conduction heat load – radiation load of sun – occupants load – equipment load – infiltration air load – miscellaneous heat sources –fresh air load – problems. Classification of duct systems – Duct design – equal friction method – velocity reduction method – problems. Chilled water Systems -Air handling Units.
Energy conservation and design decisions – heat reclaim – thermal storage – ice builder – ice harvester – variable refrigerant flow (VRF) – variable primary flow (VPF).
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