REFRIGEREATION AND AIRCONDITIONING
Group A

Introduction to refrigeration and air-conditioning, methods of refrigeration-conventional and
non-conventional, unit of refrigeration, COP and refrigeration efficiency.
Air refrigeration. Carnot. Bell Coleman, Brayton cycles, simple and bootstrap aircraft
refrigeration systems.
Mechanical refrigeration. Carnot vapour refrigeration compression cycle, simple vapour
compression cycle. Effect of sub-cooling and superheating on cycle performance, actual
vapour compression cycle, multistage and cascade refrigeration, industrial refrigeration
systems.
Vapour absorption refrigeration: Working principle, COP comparison between vapour
absorption and vapour compression refrigeration systems, actual ammonia
vapour refrigeration systems. Lithium bromide water absorption system, electrolux
refrigeration system.


Group B

 

Steam jet refrigeration system: Principle and applications, performance, actual steam jet
refrigeration. Vortex and pulse tube refrigeration, theory and operation.
Thermoelectric refrigeration: Thermoelectric elements, working principle and COP
refrigerants, desirable properties of refrigerants, primary and secondary refrigerants, various
refrigerants and their properties, alternatives to the chloro fluorocarbons.
Air-conditioning: Psychrometry, psychrometry chart and various psychometric processes,
comfort and industrial airconditioning, effective temperature and comfort chart, unitary and
central airconditioning systems.
Cooling and heating load calculations, design conditions, sensible and latent heat loads,
sensible heat ratio, structural, electrical, infiltration and ventilation heat gains, occupancy
heat gains, apparatus dew point, bypass and contact factors.



 

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