The document discusses vapour absorption refrigeration systems. It describes a simple vapour absorption system using ammonia and water, and a practical system. It defines the coefficient of performance (COP) of an ideal absorption system and lists properties desired in ideal refrigerants and absorbents. The document also discusses the domestic Electrolux refrigerator, which uses ammonia, hydrogen and water, and operates entirely through gravity flow without pumps. Key advantages of absorption systems over compression include having no moving parts and ability to operate on thermal energy alone.
The ppt contains detailed study of Vapor Absorption Refrigeration System with neat sketches and description. It is well formed as per the syllabus of GTU
Air refrigeration systems, Carnot refrigeration cycle, Brayton refrigeration or the Bell-Coleman air refrigeration cycle, Aircraft refrigeration system, Simple air cooling system, Simple air evaporative cooling system, Bootstrap air cooling, Bootstrap air evaporative air cooling, Regenerative air cooling, Reduced ambient air cooling, Comparison of different systems
The ppt contains detailed study of Vapor Absorption Refrigeration System with neat sketches and description. It is well formed as per the syllabus of GTU
Air refrigeration systems, Carnot refrigeration cycle, Brayton refrigeration or the Bell-Coleman air refrigeration cycle, Aircraft refrigeration system, Simple air cooling system, Simple air evaporative cooling system, Bootstrap air cooling, Bootstrap air evaporative air cooling, Regenerative air cooling, Reduced ambient air cooling, Comparison of different systems
Need for cooling of an aircraft. types of air-refrigeration system, DART, Advantages of air refrigeration system, Open and closed cycle air refrigeration,
vapor absorption system,three fluid vapor absorption system,water and ammonia vapor absorption system water and lithium bromide vapor absorption system
Introduction to Refrigeration and Air Conditioning was explained in a detailed way. For more information, Visit https://mechanicalstudents.com/refrigeration-introduction-vapor-compression-refrigeration-system-vapor-absorption-refrigeration-system/
Need for cooling of an aircraft. types of air-refrigeration system, DART, Advantages of air refrigeration system, Open and closed cycle air refrigeration,
vapor absorption system,three fluid vapor absorption system,water and ammonia vapor absorption system water and lithium bromide vapor absorption system
Introduction to Refrigeration and Air Conditioning was explained in a detailed way. For more information, Visit https://mechanicalstudents.com/refrigeration-introduction-vapor-compression-refrigeration-system-vapor-absorption-refrigeration-system/
It is the Short Description of the Vapor Absorption Cooling/ Refrigeration System.Contains Intro, Comparison of VCCS 7 VACS, Diagram, Advantages & Disadvantages & Applications of the System
introduction of VARS,refrigrants properties,cop,practical VARS ,
Simple VARS,advantages of VARS,comparison of vars with vcrs,Refrences of VARS,Refrigration cycles,economical system,absorbent properties
What is first law of Thermodynamics?
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What is a Refrigeration System?
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2. CONTENTS
• Introduction
• Simple Vapour Absorption System
• Practical Vapour Absorption System
• C.O.P of Ideal Vapour Absorption System
• Properties of Ideal Refrigerant and Absorbent
• Properties of Ideal Refrigerant-Absorbent combination
• Advantages of Absorption system over Compression system
• Domestic Electrolux Refrigerator
• Principle & Working of Domestic Electrolux refrigerator
• Advantages & Disadvantages of Domestic Electrolux Refrigerator
• References
3. INTRODUCTION
• It is a heat operated system.
• It is quite similar to Vapour 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.
• Here refrigerant is dissolved in inert liquid in absorber and pumped to
condenser.
• After raising pressure of refrigerant it is separated from solution by heating.
• After condensation in condenser, refrigerant is throttled by expansion valve and
then it evaporates in evaporator providing the refrigeration effect.
4. SIMPLE VAPOUR 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.
Simple Vapour Absorption System
9. PROPERTIES OF IDEAL REFRIGERANT
& ABSORBENT
Properties of ideal refrigerant :
• It should boil b/w 2˚-10 ˚C and condense at 40
˚C or above. (pressure around atmospheric)
• Large latent heat of vaporization.
• High critical temperature.
• Low specific heat.
• Stability in complete cycle.
Properties of ideal absorbent :
• Greater affinity for refrigerant.
• Heat released during absorption of refrigerant
should be minimum.
• High boiling point.
• Low specific heat.
• Chemical stability.
10. PROPERTIES OF IDEAL REFRIGERANT-
ABSORBENT COMBINATION
• Refrigerant should have high affinity for absorber at low temperatures & less affinity
at high temperatures.
• Mixture should have low specific heat and viscosity.
• It should be non-corrosive.
• Large difference in normal boiling points of refrigerant and absorbent.
Commonly used combinations in air-
conditioning applications :
• Ammonia-water
• Lithium-bromide water
11. 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. (even for above 1000 TR)
• Can be operated at designed C.O.P’s or even at part loads by varying generator
temperature.
• Space and Auto. control requirements favour absorption system.
12. DOMESTIC ELECTROLUX
REFRIGERATOR
• Developed from an invention by “Carl
Munters” & “Baltzer Von Platen”.
• Also known as “Three-fluid absorption
system” and “Munter’s Platen System”.
• Three fluids used are ammonia, hydrogen
and water.
Domestic Electrolux Refrigerator
13. PRINCIPLE & WORKING OF
ELECTROLUX REFRIGERATOR
Working cycle of Electrolux Refrigerator
14. POINTS WORTH NOTING
(FOR ELECTROLUX REF.)
• Complete cycle is carried out entirely
by flow of gravity of refrigerant.
• With this type of machine, efficiency is
not important since the energy input is
very small.
• Due to low C.O.P, it cannot be used
for industrial purposes.
ROLE OF HYDROGEN
• Helps in maintaining uniform total pressure
throughout the system.
• Permits the refrigerant to evaporate at low
temperature in evaporator, corresponding to
its partial pressure.
15. ADVANTAGES
(ELECTROLUX REF.)
• No pump/compressor required.
• No mechanical troubles, low
maintenance.
• No lubrication required, no wear-tear.
• Completely leak proof.
• Noiseless.
• Easy control, only by heat input.
• More complicated in construction and
working.
• Low C.O.P.
• If spoiled once, cannot be repaired and
has to be replaced fully.
DISADVANTAGES
(ELECTROLUX REF.)
16. REFERENCES
• Er. R.K. Rajput.Vapour Absorption Refrigeration Systems. Feb 03, 2014, “A textbook of
Refrigeration & Air-conditioning-2013”.
• Prof. M. Ramgopal. Various energy transfers in VARS (image). Feb 02, 2014, from
http://nptel.ac.in/courses/Webcourse-contents/IIT%20Kharagpur/Ref
• Prof. R. C. Arora. Domestic Electrolux Refrigerator (image). Feb 02, 2014, from
http://nptel.ac.in/courses/Webcourse-
contents/IIT%20Kharagpur/Ref%20and%20Air%20Cond/pdf