Vapour Absorption Refrigeration System in Bangla. Vapour Absorption Refrigeration Cycle in Bangla.

Today you will learn Vapour Absorption Refrigeration System in Bangla. Vapour Absorption Refrigeration Cycle, rather you can say Vapour Absorption Refrigeration System in Bangla. Vapour Absorption Refrigeration Cycle. I have already shown Vapour Absorption Refrigeration System in Bangla. Vapour Absorption Refrigeration Cycle. Which is basically a youtube vedio upload tutorial by Tanu Mazumder, It is very informative to watch Vapour Absorption Refrigeration System in Bangla. Vapour Absorption Refrigeration Cycle.
A vapour absorption refrigeration system (VARS) is a kind of refrigeration in which after evaporation the vapours of refrigerant are absorbed in an absorber solution.
The simple VARS system consists of the following components: Absorber, Pump, Generator, Pressure relief valve, Condenser, Expansion device, and Evaporator.
It is quite similar to the Vapour compression refrigeration (VCR) system as it replaces the compressor in VCR with the absorber, pump and generator.
A) ABSORBER:-
The purpose of the absorber is to absorb the low-pressure refrigerant vapours in the solution of the refrigerant and absorbent.
The weaker solution from the generator and the low-pressure refrigerant vapours from the evaporator enters the absorber. Here the refrigerant vapours are absorbed to form a stronger solution.
During the absorption, the vapours of the refrigerant lose the latent heat to change their phase from vapour to liquid. Thus it raises the temperature inside the absorber which can lower the absorption capacity of the absorbent. To avoid this, the solution is cooled with the help of cooling water.
B) PUMP:- It is used to suck the strong solution from the absorber & deliver it to the generator at higher pressure.
C) GENERATOR:- It is used to heat the strong solution by use of heating coils, solar energy or waste heat. As the refrigerant has a lower boiling point than the absorbent, the refrigerant inside the solution gets vapourised leaving the solution weaker.
If this weak solution goes to the condenser, it may damage the system. Hence the weak solution from the generator returns to the absorber through pressure reducing valve (PRV).
D) CONDENSER:- The high-pressure refrigerant vapours from the generator enter the condenser. The condenser has a cooling medium to cool the hot vapours of the refrigerant. Here the refrigerant vapours get converted into the high-pressure saturated liquid refrigerant.
E) PRESSURE REDUCING VALVE (PRV):- The pressure-reducing valve is connected between the generator (works at high pressure) and absorber (works at low pressure). It lowers the pressure of weak solution coming from the generator and then it is passed to the absorber.
F) Expansion valve:- Expansion valve is located between the condenser & evaporator. After the condenser, the high-pressure liquid refrigerant enters the expansion valve. Here the high-pressure liquid refrigerant is converted into a mixture of low-pressure refrigerant (liquid + vapour).
G) Evaporator:- The evaporator is located in the enclosed space where cooling is carried out. In the evaporator, the low-pressure liquid refrigerant absorbs the heat in the enclosed space to provide a cooling effect. due to the absorption of heat, the liquid refrigerant gets converted into low-pressure refrigerant vapours.

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