This type of refrigerator was developed in 1925 by Munters and Battzervan when they

were  studying  at Royal  Institute of Technology At Stockholm  for their  undergraduate

course.  This  type  of  refrigerator  was  known  as  three  fluid  refrigeration  system. The

elimination  of  aqua  pump  from  the  absorption  system with  the  complete  absence  of

moving parts and work input. The main purpose of removing the pump was to make the

machine noiseless. It uses refrigerant as a solvent s and an inlet gas for inlet of the system.

The inert gas is continued to the lower side of system only by its system. It is possible to

maintain the uniform pressure throughout the system and after sometime permitting the

refrigerant to evaporator at low temperature corresponding to its partial pressure. In the

high pressure side system (generator and condenser), there exists only the refrigerant

which is subjected to total pressure of the system so that it is condensed by using normal

cooling water as air as it is done in other system.

The strong aqua ammonia solution is heated in generator by the application of external

heat source. The water vapor carried with ammonia vapor is removed in separate form as

shown  in figure. Then  the dry ammonia  vapor  is passed into the condenser  and it is

condensed by using external cooling source. The liquid ammonia flows under gravity in the

evaporator and it evaporates. The mixture of hydrogen and ammonia vapor is passed into

the absorber and the weak solution from aqua ammonia from the separator is allowed to

follow into the absorber, through tray this weak aqua ammonia solution comes into contact

with hydrogen separated. This strong solution is further passed to the generator and it

completes the cycle.