Simple vapour compression refrigeration system: ideal and actual vapour compression cycles, T-s and p-h diagrams, effects of dry and wet compression, COP
Refrigerants: classification, ideal properties, chemical properties, environment friendly refrigerants
Expansion devices: types, construction and functions
Reciprocating Air Compressor (6 hours)
Air compressor terminology
Primary components of a reciprocating air compressor
Working principle of reciprocating air compressor
Work done by compressor
Volumetric and adiabatic efficiencies
Multi-stage compression
Intercoolers
Representation of p-V and T-s diagrams
Clearance volume effects
Condition for minimum work
Power required to drive a compressor
Other Compressors (6 hours)
Rotary compressors
Hermetic sealed compressors
Centrifugal compressors
Axial flow compressors
Application of compressors
Evaporators and Condensers (2 hours)
Evaporators: types, function, capacity, factors affecting heat transfer capacity
Psychometric processes: sensible heating and cooling, cooling and dehumidification, heating and humidification, humidification and dehumidification, mixing of two streams of air, evaporative cooling/adiabatic humidification
Psychrometric chart and its use
Cold Storage (8 hours)
Introduction
Functional requirements of cold storage
Condition of storage for perishable products
Calculation of cooling and heating load
Design of cold storage system and construction
Types of cooling plants for cold storage
Insulation properties and types of insulation material
Cold storage for milk, meat, fruits, vegetables, poultry and marine products
Refrigerated transport, handling and distribution, cold chain, refrigerated product handling, order picking, refrigerated vans, refrigerated display, air diffusion equipment, doors and openings
Prefabricated systems, walk-in-coolers, and refrigerated container trucks
Sensors for cold storage management
Freezer storages, freezer room temperatures, insulation of freezer rooms, pre-cooling and pre-freezing
Different Application of Heating and Cooling Processes (8 hours)
Air conditioning system: comfort conditions, equipment used
Classification: comfort and industrial air conditioning; winter, summer and year-round air conditioning; unitary and central air conditioning; applications of refrigeration and air conditioning; domestic refrigerator and freezer, ice manufacture
