JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisites

Thermodynamics

Course Objectives:

• 1. Apply the principles of thermodynamics to analyze different types of refrigeration and HAV
• 2. To understand the functionality of the major components of the refrigeration and HAV
• 3. To apply the knowledge in effective refrigeration and HAV systems for better performances in real context
• 4. Discuss the heating procedure by Air-conditioning process
• 5. Explain the requirement of ventilation devices/processes

Course Outcomes:

• 1. Differentiate between different types of refrigeration systems with respect to application as well as conventional & unconventional refrigeration systems.
• 2. Analyse thermodynamically low temperature refrigeration and Vapour absorption refrigeration for evaluation of performance parameters.
• 3. Apply the air refrigeration principles for different types of Air craft refrigeration systems
• 4. Elaborate the principles of psychometrics to design the air conditioning heating /cooling loads for industrial applications.
• 5. explain the requirement of ventilation air, various sources of infiltration air, ventilation and infiltration as a part of cooling load

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. Heating Load Calculations: Summer/ Winter heating load calculation-heat losses through structure-heat losses due to infiltration. Effects of solar radiation and internal heat sources on heating loads. Air Heating

System: Classification - gravity warm heating system, forced warm air heating system balancing a warm air heating system, warm air furnaces, air cleaners, humidifiers & De-humidifiers

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. Ventilation: Ventilation and Infiltration: Requirement of ventilation air, various sources of infiltration air, ventilation and infiltration as a part of cooling load. Fans and Blowers: Types, performance characteristics, series and parallel arrangement, selection procedure. Equipments and Controls: Chillers, Condensing units, Cooling coils, bypass factors, humidifiers, dehumidifiers

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

REFERENCE BOOKS:

• 1. Basic Refrigeration & Air Conditioning by P.N. Ananthanarayanan, McGraw Hill
• 2. Refrigeration and Air Conditioning by Stoecker, Mc Graw Hill
• 3. Refrigeration and Air Conditioning by Dr. S.S. Thipse, Jaico
• 4. Refrigeration and Air Conditioning by Jordan& Preister, Prentice Hall
• 5. Refrigeration and Air Conditioning by Dossat, Mc Graw Hill M.Tech, II Year, I Sem