Posted by: VTUBOSS

(Professional Elective-I)

Subject Code - 15ME551
IA Marks - 20  
Number of Lecture Hours/Week - 03 
Exam Hours - 03
Tutorial - 00
Exam Marks 80  
Credits – 03   

Pre-requisites: Basic and Applied Thermodynamics 

Course objectives  
1.Study the basic definition, ASHRAE Nomenclature for refrigerating systems  
2.Understand the working principles and applications of different types of refrigeration systems  
3.Study the working of air conditioning systems and their applications  
4.Identify the performance parameters and their relations of an air conditioning system
Course Outcomes  
At the end of the course, the student will be able to:  
1. Illustrate the principles, nomenclature and applications of refrigeration systems.   
2. Explain vapour compression refrigeration system and identify methods for performance              improvement  
3.Study the working principles of air, vapour absorption, thermoelectric and steam-jet and               thermoacoustic refrigeration systems   
4.Estimate the performance of air-conditioning systems using the principles of psychometry.   
5.Compute and Interpret cooling and heating loads in an air-conditioning system
6.Identify suitable refrigerant for various refrigerating systems  

Module – I 
Introduction to Refrigeration –Basic Definitions, ASHRAE Nomenclature, Air Refrigeration Cycles-reversed Carnot cycle, Bell-Coleman cycle analysis, Air Refrigeration systems-merits and demerits and applications: Aircraft refrigeration cycles, Joule Thompson coefficient and Inversion Temperature, Linde, Claude and Stirling cycles for liquefaction of air.   
Industrial Refrigeration- Chemical and process industries,   Dairy plants, Petroleum refineries,  Food processing and food chain, Miscellaneous   8 Hours    

Module – II 
Vapour Compression Refrigeration System(VCRS): Comparison of Vapour Compression Cycle and Gas cycle, Vapour Compression Refrigeration system  Working and analysis, Limitations, Superheat horn and throttling loss for various refrigerants, efficiency, Modifications to standard cycle – liquid-suction heat exchangers, Grindlay cycle and Lorenz cycle, Optimum suction condition for optimum COP – Ewing’s construction and  Gosney’s method. Actual cycles with pressure drops, Complete Vapour Compression Refrigeration System, MultiPressure, Multi-evaporator systems or Compound Vapour Compression Refrigeration Systems – Methods like Flash Gas removal, Flash inter cooling and water Inter cooli. 10 Hours  

Module – III  
Vapour Absorption Refrigeration Systems: Absorbent – Refrigerant combinations, WaterAmmonia Systems, Practical problems, Lithium- Bromide System, Contrast between the two systems, Modified Version of Aqua-Ammonia System with Rectifier and Analyzer Assembly. Practical problems – crystallization and air leakage, Commercial systems      
Other types of Refrigeration systems: Brief Discussion on (i) Steam-Jet refrigeration system and (ii) Thermoelectric refrigeration, pulse tube refrigeration, thermo acoustic refrigeration systems   8 Hours  

Module – IV 
Refrigerants: Primary and secondary refrigerants, Designation of Refrigerants, Desirable properties of refrigerants including solubility in water and   lubricating oil, material compatibility, toxicity, flammability, leak detection,   cost, environment and performance issues Thermodynamic properties of refrigerants, Synthetic and natural refrigerants, Comparison between different refrigerants vis a vis applications, Special issues and practical implications Refrigerant mixtures – zeotropic and azeotropicmixtures  
Refrigeration systems Equipment: Compressors, Condensers, Expansion Devices and Evaporators, A brief look at other components of the system.  8 Hours  

Module – V 
Air-Conditioning: Introduction to Air-Conditioning, Basic Definition, Classification, power rating, ASHRAE Nomenclature pertaining to Air-Conditioning, Applications of AirConditioning, Mathematical Analysis of Air-Conditioning Loads, Related Aspects, Different Air-Conditioning Systems-Central – Station Air-Conditioning System, Unitary Air-Conditioning System, Window AirConditioner and Packaged Air-Conditioner, Components related to AirConditioning Systems.  
Transport air conditioning Systems: Air conditioning systems for automobiles (cars, buses etc.), Air conditioning systems for trains,    Air conditioning systems for ships.   8 Hours      

1. Roy J. Dossat, Principles of Refrigeration, Wiley Limited   
2. Arora C.P., Refrigeration and Air-conditioning, Tata Mc Graw –Hill, New Delhi, 2nd Edition, 2001. 
3. Stoecker W.F., and Jones J.W., Refrigeration and Air-conditioning, Mc Graw - Hill, New Delhi 2nd edition, 1982.    

1. Dossat, Principles of Refrigeration Pearson-2006.  
2. McQuistion, Heating, Ventilation and Air Conditioning, Wiley Students edition, 5th edition                        2000.  
3. PITA, Air conditioning 4rth edition, pearson-2005  
4. Refrigeration and Air-Conditioning' by Manohar prasad  
5. S C Arora& S Domkundwar, Refrigeration and Air-Conditioning Dhanpat Rai     Publication  

Data Book:   
1. Shan K. Wang, Handbook of Air Conditioning and Refrigeration, 2/e, 2001 McGrawHill Education  
2. Mathur M.L. & Mehta ,Refrigerant and Psychrometric Properties (Tables & Charts) SI Units, F.S., Jain Brothers,2008 



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