REFRIGERATION AND AIR CONDITIONING
- Course Code 18ME642
- CIE Marks 40
- Teaching Hours /Week (L:T:P) 3:0:0
- SEE Marks 60
- Credits 03
- Exam Hours 03
Course Learning Objectives:
Study the basic definition, ASHRAE Nomenclature for refrigerating systems. Understand the working principles and applications of different types of refrigeration systems.
Study the working of air conditioning systems and their applications.
Identify the performance parameters and their relations of an air conditioning system.
Module-1
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, MiscellaneousModule-2
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 Actual cycles with pressure drops, Complete Vapour Compression Refrigeration System, Multi-Pressure, Multi-evaporator systems or Compound Vapour Compression Refrigeration Systems – Methods like Flash Gas removal, Flash inter cooling and water Inter cooling.Module-3
Vapour Absorption Refrigeration Systems: Absorbent – Refrigerant combinations, Water-AmmoniaSystems,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, thermoacoustic refrigeration systems
Module-4
Refrigerants: Primary and secondary refrigerants, Designation of Refrigerants, Desirable properties ofrefrigerants 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 azeotropic mixtures Refrigeration systems Equipment: Compressors, Condensers, Expansion Devices and Evaporators, A brief look at other components of the system.
Module-5
Air-Conditioning: Introduction to Air-Conditioning, Basic Definition, Classification, power rating,Mathematical Analysis of Air-Conditioning Loads, Related Aspects, Different Air-Conditioning Systems-Central – Station Air-Conditioning System, Unitary Air-Conditioning System, Window Air-Conditioner and Packaged Air-Conditioner, Components related to Air-Conditioning Systems.
Transport air conditioning Systems:Air conditioning systems for automobiles (cars, buses etc.), Air
conditioning systems for trains, Air conditioning systems for ships
Course Outcomes: At the end of the course, the student will be able to:
CO1: Illustrate the principles, nomenclature and applications of refrigeration systems.CO2: Explain vapour compression refrigeration system and identify methods for performance improvement
CO3: Study the working principles of air, vapour absorption, thermoelectric and steam-jet and thermoacoustic
refrigeration systems.
CO4: Estimate the performance of air-conditioning systems using the principles of psychrometry.
CO5: Compute and Interpret cooling and heating loads in an air-conditioning system.
CO6: Identify suitable refrigerant for various refrigerating systems.
Question paper pattern:
The question paper will have ten full questions carrying equal marks. Each full question will be for 20 marks.
There will be two full questions (with a maximum of four sub- questions) from each module.
Each full question will have sub- question covering all the topics under a module.
The students will have to answer five full questions, selecting one full question from each module.
Textbook/s
1 Refrigeration and Airconditioning Arora C.P Tata Mc Graw –Hill, New Delhi 2ndEdition, 20012 Principles of Refrigeration Roy J. Dossat Wiley Limited
3 Refrigeration and Airconditioning Stoecker W.F., and Jones J.W., Mc Graw - Hill, New Delhi 2nd edition, 1982.
Reference Books
1 Heating, Ventilation and Air Conditioning McQuistion Wiley Students edition 5th edition2000.2 Air conditioning PITA Pearson 4th edition 2005
3 Refrigeration and Air- Conditioning S C Arora& S Domkundwar Dhanpat Rai Publication
4 Principles of Refrigeration Dossat Pearson 2006
5 Refrigeration and Air- Conditioning Manohar prasad
6 Handbook of Air Conditioning and Refrigeration Shan K. Wang McGraw-Hill Education 2/e,2001
Data Book:
1. Mathur M.L. & Mehta,Refrigerant and Psychrometric Properties (Tables & Charts) SI Units, F.S., Jain Brothers,2008
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