History of refrigeration, Refrigeration cycles: vapour Compression Cycle and vapour absorption systems. Thermodynamic analysis of cycles.System components: Refrigerant Compressors-Reciprocating, Hermetic, Rotary, Centrifugal Scroll Compressors -Comparison, Construction and Operation characteristics. Evaporators – DX coil, flooded type Chillers, Condensing Units and Cooling Towers.
Refrigerants: Desirable properties, Classification, Designation, Alternate Refrigerants, Global Warming Potential & Ozone Depleting Potential aspects Expansion devices: Automatic Expansion Valves, Capillary Tube & Thermostatic Expansion Valves. Cycling controls and system balancing: Pressure and Temperature controls, Range and Differential settings. Selection and balancing of system components – Graphical method.
Psychrometry: Moist air behaviour – Psychrometric chart – Different Psychrometric process and their analysis. Air conditioning: Summer and Winter Air conditioning – Cooling Load Calculations – Air Distribution Patterns – Dynamic and Frictional Losses in Air Ducts – Equal Friction Method – Fan Characteristics in Duct Systems.