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It is very important notes for students, Lecture notes of Refrigeration and Air Conditioning

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2023/2024

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MECHANICALENGINEERING
Curriculum&EvaluationSchemeV&VIsemester Page35
SubjectCode:KME601Refrigeration&AirConditioningLTP:310Credits:4
Unit1 8Hours
Refrigeration:
Introductiontorefrigerationsystem,Methodsofrefrigeration,Unitofrefrigeration,Refrigerationeffect,
Carnotrefrigerationcycle,RefrigeratorandHeatPump,C.O.P.
AirRefrigerationcycle:
Openandclosedairrefrigerationcycles,ReversedairCarnotcycle,BellColemanorReversedJouleair
refrigerationcycle,NeedofAircraftrefrigeration,Classificationofaircraftrefrigerationsystem.Boot
straprefrigeration,Regenerative,Reducedambient,Dryairratedtemperature(DART).
Unit2 8Hours
VapourCompressionSystem:
ReversedvapourCarnotcycle,limitationofReversedvapourCarnotcycle,Simplevapourcompression
cycle,Analysisofvapourcompressioncycle,UseofTSandPHcharts,Effectofchangeinsuctionand
dischargepressuresonC.O.P,Effectofsubcoolingofcondensate&superheatingofrefrigerantvapour
onC.O.Pofthecycle,Actualvapourcompressionrefrigerationcycle,
MultistageSystem:
Multistagevapourcompressionsystemrequirement,Differentconfigurationofmultipressuresystem,
Removalofflashgas,Intercooling,Multievaporatorsystem,Cascadesystem.
Unit3 8Hours
VapourAbsorptionsystem;
WorkingPrincipalofvapourabsorptionrefrigerationsystem,Comparisonbetweenabsorption&
compressionsystems,Elementaryideaofrefrigerantabsorbentmixtures,Temperatureconcentration
diagram&Enthalpyconcentrationdiagram,Adiabaticmixingoftwostreams,AmmoniaWater
vapourabsorptionsystem,Lithium‐Bromidewatervapourabsorptionsystem,Comparison,Threefluid
system.
ThestudentswillbeabletoBlooms
Taxonomy
CO1UnderstandthebasicsconceptsofRefrigeration&AirConditioninganditsfuture
prospects.K2
CO2ExplaintheconstructionandworkingofvariouscomponentsinRefrigeration&
AirConditioningsystems.K2
CO3UnderstandthedifferenttypesofRACsystemswiththeirrespectiveapplications.K2
CO4Applythebasiclawstothethermodynamicanalysisofdifferentprocesses
involvedinRefrigerationandAirConditioning.K3
CO5ApplythebasicconceptstocalculatetheCOPandotherperformance
parametersfordifferentRACsystemsK3
CO6AnalyzetheeffectsofperformanceparametersonCOP.K4
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MECHANICAL ENGINEERING 

Curriculum & Evaluation Scheme V & VI semester Page 35 Subject Code: KME 601 Refrigeration & Air Conditioning L T P : 3 1 0 Credits: 4 Unit‐ 1 8 Hours Refrigeration: Introduction to refrigeration system, Methods of refrigeration, Unit of refrigeration, Refrigeration effect, Carnot refrigeration cycle, Refrigerator and Heat Pump, C.O.P. Air Refrigeration cycle: Open and closed air refrigeration cycles, Reversed air Carnot cycle, Bell Coleman or Reversed Joule air refrigeration cycle, Need of Aircraft refrigeration, Classification of aircraft refrigeration system. Boot strap refrigeration, Regenerative, Reduced ambient, Dry air rated temperature (DART). Unit‐ 2 8 Hours Vapour Compression System: Reversed vapour Carnot cycle, limitation of Reversed vapour Carnot cycle, Simple vapour compression cycle, Analysis of vapour compression cycle, Use of T‐S and P‐H charts, Effect of change in suction and discharge pressures on C.O.P, Effect of sub cooling of condensate & superheating of refrigerant vapour on C.O.P of the cycle, Actual vapour compression refrigeration cycle, Multistage System: Multistage vapour compression system requirement, Different configuration of multi pressure system, Removal of flash gas, Intercooling, Multi evaporator system, Cascade system. Unit‐ 3 8 Hours Vapour Absorption system; Working Principal of vapour absorption refrigeration system, Comparison between absorption & compression systems, Elementary idea of refrigerant absorbent mixtures, Temperature – concentration diagram & Enthalpy – concentration diagram , Adiabatic mixing of two streams, Ammonia – Water vapour absorption system, Lithium‐ Bromide water vapour absorption system, Comparison, Three fluid system. The students will be able to Blooms Taxonomy CO Understand the basics concepts of Refrigeration & Air‐Conditioning and its future prospects.

K

CO

Explain the construction and working of various components in Refrigeration & Air‐Conditioning systems.

K

CO3 Understand the different types of RAC systems with their respective applications. K CO Apply the basic laws to the thermodynamic analysis of different processes involved in Refrigeration and Air‐Conditioning.

K

CO

Apply the basic concepts to calculate the COP and other performance parameters for different RAC systems

K

CO6 Analyze the effects of performance parameters on COP. K

MECHANICAL ENGINEERING 

Curriculum & Evaluation Scheme V & VI semester Page 36 Refrigerants: Classification of refrigerants, Nomenclature, Desirable properties of refrigerants, Common refrigerants, Secondary refrigerants, and Environment friendly refrigerants, Anti‐freeze solution, Phase changing materials, Ozone layer depletion and global warming considerations of refrigerants, Selection of refrigerants, Future Refrigerants like Hydrofluoro‐Olefines Unit‐ 4 8 Hours Air Conditioning: Introduction to air conditioning, Psychrometric properties and their definitions, Psychrometric chart, Different Psychrometric processes, Air Washers, Cooling towers & humidifying efficiency, Thermal analysis of human body, Effective temperature and comfort chart, Cooling and heating load calculations, Selection of inside & outside design conditions, Heat transfer through walls & roofs, Infiltration & ventilation, Internal heat gain, Sensible heat factor ( SHF ), By pass factor, Grand Sensible heat factor (GSHF), Apparatus dew point (ADP). Window air Conditioner, Simple air conditioning system, Air conditioning system with ventilation. Unit‐ 5 8 Hours Refrigeration System Equipment : Compressors, Condensers, Expansion Devices and Evaporators, Elementary knowledge of transmission and distribution of air through ducts and fans, Application: Food preservation, Transport refrigeration, Cold storage, Refrigerates Freezers, Ice plant, Water coolers, Comfort and Industrial air conditioning Refrigeration. Other systems : Cryogenic liquefaction and refrigeration systems, Brief introduction of Thermo‐electric refrigeration system, Steam jet refrigeration system, Vortex tube refrigeration system, Magnetic refrigeration system. Reference Books:

  1. Refrigeration and Air conditioning by C.P Arora, McGraw‐Hill
  2. Refrigeration and Air conditioning, by Manohar Prasad, New Age International (P) Ltd. Pub.
    1. Refrigeration and Air conditioning by R.C. Arora, PHI
  3. Principles of Refrigeration by Roy J. Dossat. Pearson Education
  4. Refrigeration and Air conditioning by Stoecker& Jones. McGraw‐Hill
  5. Refrigeration and Air conditioning by Arora&Domkundwar. DhanpatRai
  6. Thermal Environment Engineering. By Kuhen, Ramsey &Thelked