Chapter 6 Vapour Absorption System - RAC(Refrigeration and Air Conditioning), Mechanical Engineering Mechanical Engineering Notes | EduRev

Mechanical Engineering SSC JE (Technical)

Mechanical Engineering : Chapter 6 Vapour Absorption System - RAC(Refrigeration and Air Conditioning), Mechanical Engineering Mechanical Engineering Notes | EduRev

The document Chapter 6 Vapour Absorption System - RAC(Refrigeration and Air Conditioning), Mechanical Engineering Mechanical Engineering Notes | EduRev is a part of the Mechanical Engineering Course Mechanical Engineering SSC JE (Technical).
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Chapter 6 

VAPOUR ABSORPTION SYSTEM

In this system, absorber, pump and generator combindely replaces compressor of vapour compression system. The refrigerant flows as
absorber ® Pump® Generator® Condenser® Expander® Evaporator

  •  Absorber: Here lies a weak solution which after absorbing the refrigerant becomes rich solution.
  •  Pump:it pumps rich solution raising its pressure to condenser pressure.
  •  Generator: It distills vapour refrigerant from rich solution making it weak solution for recycling in absorber.
    the cycle of rich solution flows as absorber ® pump ® generator ® valve ® absorber

COP = 
Chapter 6 Vapour Absorption System - RAC(Refrigeration and Air Conditioning), Mechanical Engineering Mechanical Engineering Notes | EduRev

  • Vapour absorption system may be considered as a combination of heat engine & refrigerating machine.

Chapter 6 Vapour Absorption System - RAC(Refrigeration and Air Conditioning), Mechanical Engineering Mechanical Engineering Notes | EduRev
Chapter 6 Vapour Absorption System - RAC(Refrigeration and Air Conditioning), Mechanical Engineering Mechanical Engineering Notes | EduRev

Maximum COP

Chapter 6 Vapour Absorption System - RAC(Refrigeration and Air Conditioning), Mechanical Engineering Mechanical Engineering Notes | EduRev
Chapter 6 Vapour Absorption System - RAC(Refrigeration and Air Conditioning), Mechanical Engineering Mechanical Engineering Notes | EduRev

  • So for maximum COP
    •  Th should be as high as possible
    •  Tk should be as low as possible
    • T0 should be as high as possible 
    • COP of vapour absorption system first increases with generator temperature
      (Th). reaches an optimum then it decreases

REQUIREMENT OF REFRIGERANT ABSORBENT PAIR

  •  Low viscosity to minimize pump work
  •  Low freezing point
  •   Chemical & thermal stability
  •  Refrigerant should be highly soluble in absorbent
  •  Their boiling point difference should be large.

Ex. Refrigerant NH3 + Absorbent H2O
Refrigerant H2O + Absorbent LiBr2

ELECTROLUX REFRIGERATOR

  •   It works on 3 fluid System e.g.,

NH3 + H2O + H2

  •  There is no solution circulation pump
  •  Third fluid remains in the evaporator.
  •  H2 is chosen as it is non corrosive & insoluble in water.
  •  Two U bends are provided to prevent H2 from going to solution
  •  The cycle runs on the basis of partial pressure variation.

Chapter 6 Vapour Absorption System - RAC(Refrigeration and Air Conditioning), Mechanical Engineering Mechanical Engineering Notes | EduRev

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