EXPLANATION OF VAPOUR ABSORPTION SYSTEM - TYPES OF REFRIGERATION SYSTEM

VAPOUR ABSORPTION SYSTEM

The main components of ammonia vapour absorption refrigeration system are,

• Heating coil

• Generator

• Analyzer

• Rectifier

• Condenser

• Expansion valve

• Evaporator

• Absorber

• Heat exchanger

• Pump

• Pressure reducing valve

Construction

• Heating coil – It is used to make Strong solution of ammonia from storage.

• Generator – It creates ammonia vapour from strong solution.

• Analyzer – It is used to remove the water content in ammonia vapour. It sends dry ammonia to condenser.

• Condenser – The main function is to condensate the dry vapour ammonia into liquid ammonia partially.

• Expansion valve – It is used to control the flow rate. Also it makes evaporator pressure on liquid refrigerant, before the liquid ammonia sent to the evaporator.

• Evaporator – The partially evaporated ammonia absorbs heat from evaporator and it produces required cooling effect.

• Absorber – In absorber, week solution of ammonia will becomes strong solution of ammonia vapour.

• Pump – It is used to transfer strong solution of ammonia vapour to the generator by through the heat exchanger.

• Heat exchanger – it is used to preheat the strong solution of ammonia. Also it transfers weak solution of ammonia from generator to absorber.

Working

• A high pressure ammonia vapour is generated by the generator.

• This ammonia vapour contains some water molecules and it sent to analyzer.

• In analyzer water content is removed from the strong ammonia vapour. Dry ammonia is passed to the condenser.

• In condenser dry ammonia vapour is partially condensed to liquid ammonia.

• Expansion valve makes the evaporator pressure on partially liquid ammonia before it entering in evaporator

• In evaporator it absorbs heat from the place to be refrigerant. So that the phase of ammonia changes to liquid. Then it is passed into the absorber.

• In absorber weak solution of ammonia becomes strong solution of ammonia (partially).

• Then the strong solution of ammonia is pumped to heat exchanger.

• In heat exchanger heart is transfer to partially strong solution from the strong solution produced by the generator.

• Pressure reducing valve is used to control the pressure of the solution.

• Finally the solution is passed into the generator.

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