Elective - I RAC

Elective-I: Refrigeration and Air Conditioning
(BTMEC704E)
Prof. Birangane V. V.
Mechanical Engg. Dept.
N. K. Orchid College of Engineering and Technology, Solapur
Mark and Exam Scheme
Teaching Scheme: Examination Scheme:
Lecture: 2 hrs/week Continuous Assessment: 20 Marks
Tutorial: 1 hr/week Mid Semester Exam: 20 Marks
End Semester Exam: 60 Marks (Duration 03 hrs)
3 Credits
2
Course Contents
• Unit 1: Introduction
• Unit 2: Vapor Compression System
• Unit 3: Compound Vapor Compression System and Vapor
Absorption System
• Unit 4: Refrigerant for Vapor Compression System and Air
Conditioning
• Unit 5: Air Conditioning Process Calculation
• Unit 6: Distribution of Air
3
Unit 1: Introduction
History, Fundamentals of refrigeration, Unit, Applications,

Methods of producing cooling, Refrigeration systems,
Thermodynamics of refrigeration, Primary and secondary
refrigeration, Heat Pump
4
Unit 2: Vapor Compression System
Thermodynamics analysis, theoretical and actual cycle, Use of P-h
and T-s diagram for problem solving, COP, Effect of evaporator and
condenser temperature on cycle performance, Effects of suction
superheating Liquid sub-cooling, liquid-vapour heat exchanger,
estimation of compressor displacement,COP and power
requirement, waste heat recover opportunities
5
Unit 3: Compound Vapor Compression System and
Vapor Absorption System
• Compound Vapor Compression System: Multi-evaporator,
multi-compressor systems, cascade system (no mathematical
treatment)
• Vapor Absorption System: Aqua-ammonia system, lithium
bromide-water system, Electrolux refrigerator, comparison with
vapor compression cycle (descriptive treatment only), P-T-ξ chart,
thermodynamic analysis, and capacity control, solar refrigeration
system
6
Unit 4: Refrigerant for Vapor Compression System and
Air Conditioning
• Refrigerant for Vapour Compression System: Desirable
Properties, Selection, Zeotrops and Azeotropes, Necessity for
replacement of CFC refrigerants, natural refrigerants
• Air Conditioning: Psychrometry, properties of moist air,
psychrometric charts. Thermal comfort: Heat transfer from human
body by sensible and latent heat transfer, metabolic heat
generation, steady state model for heat transfer, effect of clothing
and definition of effective temperatures, comfort conditions,
human comfort, comfort chart.
7
Unit 5: Air Conditioning Process Calculation
Sensible and latent heat loads, SHF, GSHF, RSHF, outside
conditions, indoor conditions, estimation of coil capacity required,
bypass factor, evaporative cooling
8
Unit 6: Distribution of Air
Principle of air distribution, duct design methods, friction chart,

duct materials, methods of noise control
All air system, all water system, unitary systems; window air-
conditioner, split air-conditioners, refrigeration and air-conditioning
controls.
9
Syllabus from ATD II(TE Mech)
• Unit 3: Refrigeration
Fundamental of refrigeration, Unit, Applications, Methods of cooling, Refrigeration
systems, Thermodynamics of Refrigeration, Air refrigeration system
Vapour Compression System :Theoretical and actual cycle, use for P-h and T-s charts
for problem solving, various effects on system performance. Refrigerants
Vapour Absorption System: Introduction, comparison with vapour compression system

Aqua-ammonia system, lithium bromide-water system.
• Unit 4: Air Conditioning

Properties of moist air, psychometric chart, Sensible and latent heat loads SHF, GSHF,
RSHF, bypass factor, air conditioning processes. Refrigeration and air conditioning
controls.
10
Reference Books
Texts:
Arora, C.P., Refrigeration and Air Conditioning, Tata McGraw Hills, New Delhi,
Second Edition, 2000.
Stoeker, W.F. and Jones, J.P., Principles of Refrigeration and Air Conditioning,
McGraw Hill, New York, Second Edition, 1982.
11
Applications
• Food processing
• Chemical and process industries
• Comfort air-conditioning
• textiles, printing, manufacturing, photographic, computer rooms, power plants
12
Thank You
13

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Elective - I RAC

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Elective-I: Refrigeration and Air Conditioning

History, Fundamentals of refrigeration, Unit, Applications,

Principle of air distribution, duct design methods, friction chart,

Vapour Absorption System: Introduction, comparison with vapour compression system

• Unit 4: Air Conditioning

Second Edition, 2000.

McGraw Hill, New York, Second Edition, 1982.

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