 మాలి చాంరిట్త్ధ మాడికిస్ట్. మాలిలికి విల్స్మి. నిగాడిలిమి. మాల్చిత్గాడ్లి మాల్స్దిదాది. ఆరికిల్రందికాస్. మాబ్పచిరిచింఆ Payalising the working of Simple Ammonia Water Vapor Absorption system. To discuss Krishna's principles, hookman of Simple Ammonia Water Vapor Absorption system. He announced the kind of working of Simple Ammonia Water Vapor Absorption system. susp...uke calves buy using one of the fact that there is a peculiar behaviors property of subsistence should have more affinity for another substances at low temperature and pressure conditions and at the same thing they have less affinity at another conditions these particular fact has created the idea of working of vapour absorption systems. Now, let us think for a while, why would we call these systems as vape хороший system? Now, we know that we have already studied vapour compression size system. In vapour compression system we use a compressor the vapor coming from the evaporator and so it is called a vapor compression system whereas in case of vapor absorption system the vapor vapor of the refrigerant coming out of the evaporator it is not compress instead of compressing it is absorbed in the absorber so in absorber we will have a substance which will have affinity for refrigerant coming out of the evaporator which will be able to absorb the refrigerant vapor in the absorber that is why in case of vapor absorption system the compressor is absent the work of function of compressor is being carried out by three other devices which we are going to see in the next slide and that is why because we absorb the vapor coming out of the evaporator these refrigeration systems are called as vapor absorption system now what is the principle behind vapor absorption system now in simple aqua ammonia vapor absorption system the ammonia is used as refrigerant whereas water is used as absorbant as just now we have seen the water is having strong affinity for ammonia at low pressure and temperature and less affinity for ammonia at high pressure and temperature and so the water will be used as absorbant and ammonia is used as refrigerant and just now as I told you the solubility of ammonia in water is higher at low pressure and temperature whereas it is less at higher temperature and pressure now we will see the working of simple vapor absorption system now you can see here the very beautiful diagram of simple vapor absorption system now we will start from the evaporator section now in the evaporator as already we know the liquid refrigerant which is coming out of the condenser first of all it is stored in the receiver and then from the receiver it passes to the expansion wall now expansion wall function is to reduce the pressure of the refrigerant liquid refrigerant from condenser pressure to the evaporator pressure now condenser pressure will be corresponding to the saturation temperature of the refrigerant which will be used for condensing the refrigerant whereas the evaporator pressure will be corresponding to the required temperature in the evaporator in evaporator we maintain the temperature which is desired to be produced so the function of expansion wall now expansion wall is nothing but the throttle wall there are various types of expansion wall we can use any type of expansion wall or throttle wall but its function will be same to reduce the pressure of the refrigerant from condenser pressure to the required evaporator pressure so when this liquid refrigerant after expanding to the low pressure it now passes to the evaporator now in the evaporator this liquid refrigerant will absorb the heat from the surrounding space so here after absorbing the heat from the surrounding space this liquid refrigerant gets converted into vapor and the heat absorbed in the evaporator we have shown here as qg that is nothing but the refrigerant effect produced now this particular low pressure and low temperature vapor now though it has absorbed the heat in the evaporator this is a what you can say latent heat phenomena so the vapor is getting converted into liquid sorry the liquid refrigerant is getting converted into vapor so here latent heat of vaporization is absorbed in the evaporator therefore the temperature won't change temperature is still lower only and so this low pressure and low temperature ammonia vapor now passes to the absorber now inside the absorber as we have discussed just now the substance that is water is used as a absorber which has got strong affinity for ammonia vapor at low pressure and temperature so this ammonia vapor will be rigorously absorbed in the absorber now after absorbing the ammonia vapor in the water we get the strong aqua ammonia solution this is a strong solution but this particular reaction of absorption of ammonia vapor into water is an exothermic reaction so heat is produced in the absorber and this heat has to be removed by you circulating the cooling water or any other suitable medium if we don't remove this heat from the absorber ok so here I have shown the heat rejected from the absorber is qa so if we don't remove this heat then the ability of water to absorb the ammonia vapor reduces which is not desirable so cooling of the absorber is equally important in case of vapor absorption system now we will move ahead so once we get the strong solution of aqua ammonia due to absorption of ammonia vapor into water this particular strong solution is now pumped to higher pressure into the generator so here we have shown 1 to 2 is the absorption process 2 to 3 is the pumping so we require to supply some pump work WP and equivalent pump work we have denoted by Kiwi in terms of heat equivalent QP now this particular strong solution of aqua ammonia when it passes to the generator so in generator we are supplying the heat now this heat supplied can be in the form of steam waste steam available or any other form of waste heat or even we can supply with the help of electric heating coil but usually we supply hot water or steam or any other form of waste heat it is available so in the generator when we supply the heat which is shown as heat supplied as QG that is the heat supplied in the generator the ammonia being having a lower boiling point it will vaporize and here we will get high pressure ammonia vapor separated so what will be remaining in the generator now in the generator when we remove the ammonia vapor we should get the water but some traces of ammonia will be still present because 100% evaporation of ammonia vapor is not possible so we get the weak solution of aqua ammonia now this weak solution is again expanded down with the help of pressure reducing wall into the absorber so in the absorber again this weak solution will come back and it will be available for absorbing the coming low pressure ammonia vapor now this particular high pressure ammonia vapor which is separated in the generator will now pass to the condenser now we know that the function of condenser is to condense the vapor into the liquid so in case of this vapor absorber system condenser condenser can be shell and tube type and we are using usually the cooling water for absorbing the heat of latent heat of condensation so this high pressure ammonia vapor enters into the condenser and water is circulated through the tubes so the water will absorb the heat that is latent heat of condensation and we will get here now the liquid ammonia which is again stored in the receiver and expanded back and supplied to the evaporator so that completes our cycle now let us see how to find out the COP of vapor absorber system in case of vapor absorber system the refrigerating effect is heat absorbed by refrigerant in the evaporator which we have shown as QE divided by total energy supplied is the sum of work supplied to the pump and heat supplied in the generator so this equation thus the equation of COP can be written as refrigerating effect divided by total energy supplied so QE upon WP plus QG that is QE is the heat absorbed in the evaporator WP is the pump work and QG is the heat supplied in the generator so usually the pump work is negligible and therefore the COP is given by QE upon QG that is the heat absorbed in the evaporator divided by heat supplied in the generator these are the references thank you