JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Course Objectives:

• To understand the principles of refrigeration.
• To understand different vapor Absorption systems.
• To know Aircraft Air refrigeration systems.
• To gain knowledge about refrigerants.
• Ozone depletion potential and global warming potential.

Course Outcomes

On successful completion of the course, the student will be able to:

• Illustrate the basic concepts of refrigeration system.
• Analyze the vapour compression cycle and interpret the usage of refrigerants.
• Explain the components of vapour absorption system.
• Demonstrate the use of refrigerants.
• Discuss the theory Ozone depletion potential and global warming potential.

UNIT - I

Vapor Compression Refrigeration: Analysis of vapor compression refrigeration cycle - reversed Carnot cycle for vapour - effect of suction temperature and condensing temperature on cycle performance – Practical refrigeration cycle – sub-cooled liquid and super-heated vapor refrigeration cycles their effect on performance. Multi Pressure Systems- removal of flash gas- intercooling –compound compression (conversion)-multi vapor systems- cascade systems- dual compression- system practices.

UNIT - II

Simple vapor Absorption systems- actual vapor absorption cycle- representation of the cycle on H-C diagram- common refrigerant- (Absorbent)Adsorbent) systems. Practical single effect Water- Lithium Bromide Absorption system- double effect system Electrolux refrigerator- newer mixtures for absorption systems.

UNIT - III

Aircraft Air refrigeration – Functions – working conditions – types. Steam jet water vapor systems- thermoelectric refrigeration systems - vortex refrigeration system - pulse tube refrigeration.

UNIT - IV

Refrigerants: Desirable properties- thermo dynamic-chemical and transport properties - designation of refrigerants - inorganic, halo carbon refrigerants - secondary refrigerants - Properties of mixtures of refrigerants

UNIT - V

Ozone depletion potential and global warming potential – effect of refrigerants- alternative refrigerants- newer refrigerants.

TEXT BOOKS:

• 1. R & A/C by F. Stoecker & Jerold. W. Jones-MGH Intl., 1982.
• 2. R & A/C by C. P. Arora, TMGH -2000.

REFERENCE BOOKS:

• 1. R & A/C by Manohar Prasad.
• 2. Principles of Refrigeration by Roy. J. Dossat, 1997.
• 3. Refrigeration by Gosney- Oxford University Press-1980. M. TECH. II Year I Sem.