Refrigeration and Air Conditioning
ME 4507
Professor Dr. Mohammad Zoynal Abedin
abedin.mzoynal@duet.ac.bd
Department of Mechanical Engineering
Dhaka University of Engineering and Technology, Gazipur
www.duet.ac.bd
Course Content
ME 4507 Refrigeration & Air Conditioning
3 hours/week Credits : 3.00
Refrigeration: Basic concepts and definitions of refrigeration and its
applications; Different refrigeration methods: Analysis of vapor compression
refrigeration system, vapor absorption refrigeration system, air-cycle
refrigeration systems, Steam jet refrigeration system, Vortex tube refrigeration
system. Refrigerants - Classification and properties of commonly used
refrigerants and modern development; Selection criteria based on global
effects; Refrigeration equipments:- Compressors, evaporators, condensers,
expansion devices, other control and safety devices. Multi-pressure system of
refrigeration; Low temperature refrigeration:- Linde, Claude, Cascade and
mixed refrigerant systems; Manufacturing of dry ice; Magnetic cooling;
Air Conditioning: Basic concepts and definitions of air conditioning and its
applications; Classification of air conditioning systems; Psychometric analysis;
Various psychometric process. Cooling and heating load calculations; Duct
design methods; Air conditioning systems; Air handling and distribution
systems; Air conditioning equipment: Chiller, Cooling tower, etc; Application
criteria; Control systems; Refrigerant charging; leak detection methods.
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Reference Books
a. Course notes:
b. Essential books (text books):
1. Refrigeration and Air Conditioning by Stocker and Jones, 2nd Edition.
2. Refrigeration and Air Conditioning by Ahmadul Ameen, Eastern Economy Edition.
3. Air Conditioning and Refrigeration by R Miller and M R Miller.
4. Refrigeration and Air Conditioning, by G Gundy, A Trott, T C Welch, 4th edition.
c. Recommended reference book:
1. Refrigeration and Air Conditioning by C P Arora, Tata McGraw Hill, 3rd Edition.
2. A textbook of refrigeration and air conditioning by R.A Rajput
d. Websites/journals: www.duet.ac.bd
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Low Temperature Refrigeration System
Cryogenics or Low temperature refrigeration system:
Types:
- Magnetic cooling or adiabatic demagnetization
- Air liquefaction system
- Linde system
- Claude system
- Cascade and mixed refrigerant systems
- Liquid Helium
- Liquid Nitrogen
- Liquid Hydrogen
- Manufacturing of dry ice or Solid Carbon-di-oxide manufacturing
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Low Temperature Refrigeration System
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Low Temperature Refrigeration System
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Low Temperature Refrigeration System
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Magnetic Cooling or Adiabatic Demagnetization
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Air Liquefaction System
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Air Liquefaction System
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Liquefaction of Neon, Hydrogen and Helium
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Liquefaction of CNG to LNG
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Low Temperature Refrigeration System
Cascade and mixed refrigerant systems:
➢ The cascade refrigeration system is a freezing system that uses two kinds of refrigerants
having different boiling points, which run through their own independent freezing cycle
and are joined by a heat exchanger.
➢ This system is employed to obtain temperatures of -40 to -80°C or ultra-low
temperatures lower than them.
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Cascade Refrigeration System Problems
A two-stage cascade refrigeration cycle with a flash chamber with refrigerant-134a as the
working fluid is considered. The mass flow rate of the refrigerant through the high-
pressure compressor, the rate of refrigeration, the COP are to be determined. Also, the
rate of refrigeration and the COP are to be determined if this refrigerator operated on a
single-stage vapor-compression cycle under similar conditions.
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Cascade Refrigeration System Problems
The mass flow rate of the refrigerant through the high pressure compressor is determined
from a mass balance on the flash chamber
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Cascade Refrigeration System Problems
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Manufacturing of Dry Ice or Solid Carbon-di-oxide manufacturing
➢ Dry ice, sometimes referred to as
"cardice", is the solid form of carbon
dioxide.
➢ It is used primarily as a cooling agent.
➢ Its advantages include lower temperature
than that of water ice and not leaving any
residue (other than incidental frost from
moisture in the atmosphere).
➢ It is useful for preserving frozen foods
where mechanical cooling is unavailable.
➢ Dry ice sublimates at 194.65 K (−78.5 °C;
−109.3 °F), at Earth atmospheric
pressures.
➢ This extreme cold makes the solid
dangerous to handle without protection
due to burns caused by freezing
(frostbite).
➢ While generally not very toxic, the
outgassing from it can cause hypercapnia
(abnormally elevated carbon dioxide levels
in the blood) due to buildup in confined
locations.
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Manufacturing of Dry Ice or Solid Carbon-di-oxide manufacturing
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Manufacturing of Dry Ice or Solid Carbon-di-oxide manufacturing
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Cold Storage Design
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Cold Storage Design
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Cold Storage Design
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Cold Storage Design
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Cold Storage Design
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Cold Storage Design
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Cold Storage Design
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
Thank You
For
Cooperation
Prof. Dr. Mohammad Zoynal Abedin Refrigeration and Air Conditioning
Dept. of ME, DUET, Gazipur ME-4507
