Refrigeration and Air Conditioning
UNIT I: INTRODUCTION TO REFRIGERATION
Basic concepts of refrigeration and air conditioning, applications, Unit of refrigeration.
Gas (Air) Cycle Refrigeration: Reversed Carnot cycle Bell Coleman cycle Open and
Dense airsystems Actual air refrigeration system Refrigeration needs of Aircraft Air
refrigeration systems Simple Air Refrigeration system, Bootstrap Air Refrigeration
system, Regenerative Air Refrigeration system.
UNIT II: VAPOUR COMPRESSION REFRIGERATION CYCLES
Simple Vapour compression refrigeration cycle Working principle, essential
components, COP, representation of cycle on T–S and ph charts Effect of sub
cooling and superheating– Cycle analysis, Actual cycle Influence of various
parameters on system performance Numerical Problems
UNIT III: REFRIGERATION SYSTEM COMPONENTS
Compressors: Classification –single stage reciprocating compressors Working
Principle, workdone with and without clearance volume, capacity control.
Condensers: Classification–Working of evaporative condensers
Evaporators: Classification–Working of flooded and dry expansion evaporators.
Expansion Devices: Types–capillary tube, automatic expansion valve, thermostatic
expansionvalve.
Refrigerants: Desirable properties–classification refrigerants.
UNIT IV: VAPOR ABSORPTION REFRIGERATION SYSTEM
Calculation of Maximum COP Description and working of NH3–Water system and Li Br–
Water System Principle of operation of Electrolux refrigeration system, salient features.
Nonconventional Refrigeration Methods: Working Principle and Basic Components Steam jet
refrigeration system, thermoelectric refrigerator, Vortex tube.
UNIT V: INTRODUCTION TO AIR CONDITIONING
Psychrometric Properties & Processes–Characterization of Sensible and latent heat loads. Need
for Ventilation, Consideration of Infiltration, Load concepts of RSHF, GSHF, ESHF and ADP.
Human Comfort: Concept of human comfort and effective temperature, Comfort Air
conditioning –Requirements of Industrial air conditioning.
UNIT VI: AIR CONDITIONING SYSTEMS
Winter, summer, Central air-conditioning systems Air-conditioning load calculations
Classification of equipment: Cooling, Heating, Humidification, Dehumidification, Filters,
Grills, Fans and Blowers.
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