vapour absorption system_lect_5
TRANSCRIPT
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Refrigeration
and
Air-Conditioning
Lecture-5
Mechanical Engg. Department
Geeta Engineering College
Naultha Panipat
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Simple vapour absorption system
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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.
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Practical vapour absorption system
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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
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Ammonia Hydrogen (Electrolux)
Refrigeration system
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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.
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Lithium Bromide Absorption system
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