The document summarizes vapor absorption refrigeration systems, which use heat rather than mechanical work to power the refrigeration cycle. It describes the basic components and process, including how ammonia vapor is absorbed by water in the absorber, generated by heat in the generator, condensed in the condenser, and evaporated in the evaporator to absorb heat. It also discusses advantages over vapor compression systems, such as having no moving parts besides the pump and being able to operate using only thermal energy.

1. Vapor Absorption
Refrigeration System
Submitted To :
 Sir. Rizwan Minhas
Presented By :
 Muhammad Zeeshan Ali
 Saad Naseer Awan
 Zaid Amjad
 Muhammad Kashif Latif
 Naeem Akhter

2. It is a heat operated system.
It is quite similar to Vapor Compression systems.
Condensation and evaporation takes place at two
different pressure levels to achieve refrigeration.
The main motive is to raise the temperature of the
refrigerant from evaporator pressure to condenser
pressure.
Introduction

3. Simple Vapor Absorption
System
Ammonia vapour from evaporator is absorbed
by water in absorber. Condensation heat
released is absorbed by cooling water.
After being pumped to generator, heat is
supplied which gives ammonia vapour. Weak
sol. sent back to absorber.
High pressure vapour is condensed to high
pressure liquid ammonia in condenser.
Liquid ammonia is throttled by expansion
valve, and then it evaporates absorbing heat
from evaporator.

4. Practical Vapour Absorption System
Water vapours if reach condenser may block the
expansion valve. Therefore, analyser-rectifier is
used practically.
Analyser : Strong solution flows down the trays.
Due to high saturation temperature water
condenses down and 𝑵𝑯 𝟑 vapours escape
through.
Rectifier : A water cooled heat exchanger which
further condenses water vapour. (If any left)
Heat Exchanger : Used to cool weak solution from
generator. It also heats the strong solution coming
from pump, thereby reducing heat to be supplied
at generator, increasing economy.

5. Advantages of absorption system over
compression system
No moving part except pump-motor, which is
comparatively smaller than compressor system.
Quiet in operation, low maintenance cost.
Can work only with thermal energy as an input.
Can be built for huge working capacities.

6. Ammonia Hydrogen (Electrolux)
Refrigeration system

7. Electrolux Refrigeration system
This type of refrigerator is also called three fluid absorption
system
The three fluids used are ammonia, water and hydrogen.
The ammonia act as the refrigerant.
The hydrogen being the lightest gas is used to increase the rate
of evaporation of the liquid ammonia passing through the
evaporator.
Water acts as the solvent.

8. Coefficient Of Absorption System

9. Environmental Effects of
Refrigerants
Ozone layer Depletion.
Global warming.

10. THANK
YOU!