Refrigeration and Airconditioning


REFRIGEREATION AND AIRCONDITIONING 

Group A
Introduction to refrigeration and air-conditioning , methods of refrigeration-conventional and
non-conventional, unit of refrigeratio n, COP and refrigeration efficiency.
Air refrigeration. Carnot. Bell Coleman, Bray ton 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 refr igeration systems, actual ammonia
vapour refrigeration systems. Lithium brom ide 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 refrigeran ts, primary and secondary  refrigerants, various
refrigerants and their properties, alte rnatives to the chloro fluorocarbons.
Air-conditioning: Psychrometry, psychrometry ch art and various psycho metric 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 vent ilation heat gains, occupancy
heat gains, apparatus dew point, bypass and contact factors.

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