Mechanical Engineering(8th Sem.)
Refrigeration & Air Conditioning material
__________________________________Note Guided by NTPC 11/04/2012
Shared by: N Rajput(GEC, Raipur)
Refrigeration & Air Conditioning__________________________________1. Unit-1
2. Unit-2
3. Unit-3
4. Unit-4
5. Unit-5
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Refrigeration & Air Conditioning SyllabusUNIT – 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. UNIT – 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. UNIT – 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. UNIT – 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. UNIT – 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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