7 ME 2-REFRIGERATION AND AIR CONDITIONING |
Units: I |
Introduction
Refrigeration and second law of Thermodynamics, Refrigeration effect and unit of
Refrigeration, Heat pump, reversed Carnot cycle.
Vapour Compression Refrigeration System
Analysis of simple vapour compression Refrigeration cycle by p-h and T-S diagram.
Effect of operating conditions, liquid vapour heat exchangers, actual refrigeration cycle.
Multiple Evaporator and compressor system.
Application, air compressor system, Individual compressor, compound compression, cascade
system. Application, air compressor systems, individual compressor, compound compression,
cascade system.
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Units: II |
Gas cycle Refrigeration
Limitation of Carnot cycle with gas, reversed Brayton cycle, Brayton cycle with regenerative
H.E.
Air cycle for air craft
Necessity of cooling of air craft, Basic cycle, boot strap, regenerative type air craft
refrigeration cycle. |
Units: III |
Vapour Absorption System
Simple Vapour absorption system, Electrolux Refrigerator, Analysis of Ammonia
absorption refrigeration system, Lithium Bromide Absorption Refrigeration System.
Refrigerants
Classification, Nomenclature, selection of Refrigerants, global warming potential of CFC
Refrigerants.
Refrigeration Equipments
Compressor, condenser, evaporator, expansion devices – types & working.
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Units: IV |
Psychrometry
Psychrometric properties, psychometric relations, pyschrormetric charts,
psychrometric processes, cooling coils, By-pass factor and air washers.
Human Comfort
Mechanism of body heat losses, factors affecting human comfort, effective temperature,
comfort chart.
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Units: V |
Cooling load calculations
Internal heat gain, system heat gain, RSHF, ERSHF, GSHF, cooling load estimation, heating
load estimation, psychrometric calculation for cooling, selection of air conditioning,
apparatus for cooling and dehumidification, Air conditioning system
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