GTU Study
KHUDKIBOOK
REFRIGERATION AND AIR
FREE PDF
2161908
Code: 2161908
Credits: 5
Semester 6
Auto
Refrigeration and Air Conditioning
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GTU Previous Year Papers
Refrigeration and Air Conditioning Syllabus — Unit-wise Content
The official GTU curriculum for Refrigeration and Air Conditioning (subject code 2161908) as prescribed for Auto · Semester 6 divides the course into 11 units, covering 76 listed topics. The unit-wise breakdown below is read from the GTU syllabus document for this subject code, so you can check what the course actually covers before deciding which papers to attempt.
Download the official syllabus PDF (2161908)Unit 1 Introduction
- Brief history and need of refrigeration and air conditioning
- methods of producing cooling
- ton of refrigeration
- coefficient of performance
- types and application of refrigeration and air condensing systems
Unit 2 Refrigerants
- desirable properties
- secondary refrigerants
- future industrial refrigerants
Unit 3 Air refrigeration
- Reversed Carnot cycle and its limitation
- Bell-Coleman cycle
- aircraft refrigeration
- working and analysis of Simple
- Reduced ambient and Regenerative air refrigeration systems
Unit 4 Vapour Compression system
- Simple system on P-h and T-s diagrams
- analysis of the simple cycle
- factors affecting the performance of the cycle
- actual cycle Compound Compression System: Compound compression with intercooler
- flash gas removal and flash intercooler
- multiple evaporators with back pressure valves and with multiple expansion valves without flash inter cooling
- analysis of two evaporators with flash intercooler and individual expansion valve and multiple expansion valve
- cascade refrigeration system
Unit 5 Absorption refrigeration system
- Desirable characteristics of refrigerant
- selection of pair
- practical H2O -NH3 cycle
- LiBr – H2O system and its working
- h-x diagram and simple calculation of various process like adiabatic mixing and mixing with heat transfer
- Electrolux refrigeration system*
Unit 6 Refrigeration system components
- comparison and selection of compressors*
- expansion devices
- and evaporators
- refrigeration piping accessories*
- evacuation and charging of refrigerant*
- properties and classification of thermal insulation
Unit 7 Psychrometry
- Dalton’s law of partial pressure
- Properties of moist air, temperature and humidity measuring instruments
- psychrometric chart
- psychrometric processes such as sensible heating and cooling
- heating and humidification cooling and dehumidification
- chemical dehumidification
- adiabatic saturation
Unit 8 Human comfort
- Selection of inside design conditions
- thermal comfort
- heat balance equation for a human being
- factors affecting thermal comfort
- Effective temperature
- comfort chart and factors governing effective temperature
- selection of outside design conditions
Unit 9 Load analysis
- Site survey
- outdoor and indoor design conditions
- classification of loads
- flywheel effect of building material and its use in design
- effect of wall construction on cooling load
- instantaneous heat gain (IHG) and instantaneous cooling load (ICL) heat transmission through sunlit and shaded glass using tables
- method of reduction of solar heat gain through glass
- calculations of cooling load TETD due to sunlit and shaded roof and walls using tables
- ventilation and air infiltration
- load due to outside air, heat gain from occupants
- electric lights
- electric motor and appliances
- load calculations for automobiles
- use of load estimation sheet*
- introduction of CLTD method
Unit 10 Duct design and air distribution
- classification and economic factors influencing duct layout
- equal friction method of duct design
- use of friction chart
- dynamic losses and its determination
- Requirements of air distribution system
- air distribution
Unit 11 Air-conditioning systems
- system components
- all air
- all water
- and air-water systems
- room air conditioners
- packaged air conditioning plant
- central air conditioning systems
- split air conditioning systems * To be covered in practical sessions only
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