JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisites

Thermodynamics

Course Objectives:

• To apply the principles of thermodynamics to analyze different types of refrigeration and air conditioning systems and to understand the functionality of the major components.

Course Outcomes:

• Differentiate between different types of refrigeration systems with respect to application as well as conventional & unconventional refrigeration systems.
• Thermodynamically analyze refrigeration and air conditioning systems and evaluate performance parameters.
• Apply the principles of psychometrics to design the air conditioning loads for industrial applications.

UNIT - I

Vapour Compression Refrigeration: Performance of Complete vapor compression system. Actual Vs Ideal cycle - Effect of operating parameters on COP, Components of Vapor Compression System: The condensing unit – Evaporators – Expansion valve – Refrigerants – Properties – ODP & GWP - Load balancing of vapor compression Unit. Compound Compression: Flash inter-cooling – flash chamber – Multi-evaporator & Multistage systems.

UNIT - II

Production of Low Temperature: Liquefaction system, Liquefaction of gases, Hydrogen and Helium, Cascade System – Applications– Dry ice system. Vapor absorption system – Simple and modified aqua – ammonia system – Representation on Enthalpy –Concentration diagram. Lithium – Bromide system Three fluid system – HCOP.

UNIT - III

Air Refrigeration: Applications – Air Craft Refrigeration -Simple, Bootstrap, Regenerative and Reduced ambient systems – Problems based on different systems. Steam Jet refrigeration system: Representation on T-s and h-s diagrams – limitations and applications. Unconventional Refrigeration system – Thermo-electric – Vortex tube & Pulse tube – working principles.

UNIT - IV

Air Conditioning: Psychometric properties and processes – Construction of Psychometric chart. Requirements of Comfort Air –conditioning – Thermodynamics of human body – Effective temperature and Comfort chart – Parameters influencing the Effective Temperature. Summer, winter and year- round air – conditioning systems. Cooling load Estimation: Occupants, equipments, infiltration, duet heat gain fan load, Fresh air load.

UNIT - V

Air Conditioning Systems: All Fresh air, Re-circulated air with and without bypass, with reheat systems – Calculation of Bypass Factor, ADP, RSHF, ESHF and GSHF for different systems.

R19 M.Tech. Thermal Engineering

Components: Humidification and dehumidification equipment – Systems of Air cleaning – Grills and diffusers – Fans and blowers – Measurement and control of Temperature and Humidity.

TEXT BOOKS:

• 1. Refrigeration & Air Conditioning by C.P. Arora, TMH
• 2. Refrigeration & Air Conditioning by Arora & Domkundwar, Dhanpat Rai
• 3. Refrigeration and Air Conditioning by Manohar Prasad
• 4. Refrigeration and Air Conditioning by Stoecker, Mc Graw Hill

REFERENCE BOOKS:

• 1. Basic Refrigeration & Air Conditioning by P.N. Ananthanarayanan, McGraw Hill
• 2. Refrigeration and Air Conditioning by Dr. S.S. Thipse, Jaico
• 3. Principles of Refrigeration by Dossat, Pearson
• 4. Refrigeration and Air Conditioning by Jordan& Preister, Prentice Hall
• 5. Refrigeration and Air Conditioning by Dossat, Mc Graw Hill R19 M.Tech. Thermal Engineering M. TECH. II Year I Sem. (THERMAL ENGINEERING)