JNTUA B.Tech. R20 Regulations

########## JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY ANANTAPUR B.Tech (ME) - IV-I Sem L T P C 3 0 0 3 (20A03702c) REFRIGERATION AND AIR CONDITIONING (Professional Elective-IV) Course Objectives:

- • Provides insights in how thermodynamic principles are applied within the refrigeration and air conditioning industry.
- • Introduce the students how real systems used in commercial, industrial refrigeration and air conditioning industries are built-up.
- • Expose the students on various refrigeration methods like VCR, VARand latest developments.
- • Know the various air conditioning methods like summer, winter and year round air conditioning and to make the student to understand the practical applications of refrigeration and air conditioning systems.

########## Course Outcomes:

At the end the student will be able to

- • Appraise the importance of humidifiers and dehumidifiers
- • Select the requirements of temperature and humidity for human comfort
- • Demonstrate the heat pump working and its components
- • List the various air conditioning equipments

########## UNIT I Introduction to Refrigeration

Necessity and Applications, Carnot Refrigerator, First and Second Law Applied to Refrigerating Machines, Unit of Refrigeration, COP, EER, Different Refrigeration Methods. Bell-Coleman Cycle, Ideal and Actual Cycles, Open and Dense Air Systems - Air Refrigeration: Refrigeration: Numerical Problems - Refrigeration Needs of Air Crafts.

########## UNIT IIVapour Compression Refrigeration ( VCR) System

Vapour Compression Refrigeration ( VCR ) System - Basic Cycle - Working Principle and Essential Components of the Plant - COP - Representation of Cycle On T-S and P-h Charts - Expander Vs. Throttling, Effect of Sub Cooling and Super Heating - Cycle Analysis - Actual Cycle- Influence of Various Parameters on System Performance - Construction and Use of P-h Charts - Numerical Problems. Refrigerants - Desirable Properties - Classification of Refrigerants Used - Nomenclature- Secondary Refrigerants- Lubricants - Ozone Depletion - Global Warming- Newer Refrigerants.

UNIT IIIVapor Absorption Refrigeration ( VAR) System -Description and Working of NH3 - Water System Vapor Absorption Refrigeration ( VAR ) System -Description and Working of NH3 - Water System Vapor Absorption Refrigeration ( VAR ) System and Li Br -Water ( Two Shell & Four Shell) System -Calculation of Max COP, Principle of Operation of Three Fluid Absorption System Working Principle and Basic Components-Estimation STEAM JET REFRIGERATION SYSTEM: JET REFRIGERATION SYSTEM: of Motive Steam Required Principle and Operation of: (I) Thermo-Electric Refrigerator (ii) Vortex Tube or Hilsch Tube.

########## UNIT IVIntroduction to Air Conditioning:

Psychrometric Properties &Processes - Characterization of Sensible and Latent Heat Loads - Need For Ventilation, Consideration of Infiltrated Air - Heat Load Concepts. Air Cooler (Evaporative Cooling) ,Window, Split, Summer , Winter, Year Round, Central Air Conditioning Systems.

########## UNIT VAir Conditioning Equipment

Air Conditioning Equipment - Humidifiers - Dehumidifiers - Air Filters, Fans and Blowers. Human Comfort Requirements of Temperature, Humidity And Concept of Effective Temperature, : Comfort Chart. Heat Pump - Heat Sources - Different Heat Pump Circuits.

########## Textbooks:

- 1. Refrigeration and Air Conditioning, CPArora, TMH, 15/e, 2013.
- 2. S. CArora &Domkundwar, A Course in Refrigeration and Air conditioning, Dhanpat rai &Co, 2018.

########## Reference Books: