9
Refrigeration and Air-Conditioning Lecture-5 Mechanical Engg. Department Geeta Engineering College Naultha Panipat

Vapour absorption system_lect_5

Embed Size (px)

Citation preview

Page 1: Vapour absorption system_lect_5

Refrigeration

and

Air-Conditioning

Lecture-5

Mechanical Engg. Department

Geeta Engineering College

Naultha Panipat

Page 2: Vapour absorption system_lect_5

Simple vapour absorption system

Page 3: Vapour absorption system_lect_5

Simple vapour absorption system• In this system an absorber, a pump, a generator and a pressure

reducing valve replace the compressor.

• The low pressure ammonia vapour leaving the evaporator

enters the absorber where it is absorbed by the cold water in

the absorber.

• The water has the ability to absorb the large quantity of

ammmonia vapour.

• Heat is removed in the absorber to increase the absorption

capacity of water.

• The strong solution in the absorber is pumped to the genarator.

• The strong solution is heated in the generator during the

heating the ammonia vapours are driven off the solution and

the weak solution flows back to the absorber.

Page 4: Vapour absorption system_lect_5

Practical vapour absorption system

Page 5: Vapour absorption system_lect_5

Practical vapour absorption system

• The simple vapour absorption system discussed previously is

not very economical.

• To improve the effectiveness it is fitted with the accessories an

analyser, a rectifier and two heat exchangers

Page 6: Vapour absorption system_lect_5

Ammonia Hydrogen (Electrolux)

Refrigeration system

Page 7: Vapour absorption system_lect_5

Electrolux Refrigeration system• This type of refrigerator is also called three fluid absorption

system

• The main purpose of this system is to eliminate the pump so

that in the absence of moving part the machine becomes

noiseless.

• 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.

Page 8: Vapour absorption system_lect_5

Lithium Bromide Absorption system

Page 9: Vapour absorption system_lect_5

THANKS