welcome to academic gain tutorials in this video we will learn how a vapour absorption refrigeration system works along with its different parts and functions so let's get into the topic the vapour absorption refrigeration system is almost similar to a vapour compression refrigeration system but here we have replaced the compressor with an absorber hence the name vapour absorption refrigeration is given to this system in the vapour absorption refrigeration system we are discussing today we will use ammonia water solution which will run throughout the system so we have ammonia which is the refrigerant that gives the cooling effect or refrigeration effect and there will be water which acts as an absorbent water has a strong affinity towards ammonia so the ammonia water solution is formed and we will use this solution to run the vapour absorption refrigeration process now let's look into the major parts and components and basic working procedure of vapour absorption refrigeration system first of all here we have an evaporator where the refrigeration effect or the cooling effect takes place there is an absorber which contains the solution of ammonia and water a pump is placed beside the absorber which is used to pump this ammonia water solution from the absorber to the generator there is a generator with an analyzer fitted on the top of it a pressure reducing valve a condenser which converts the incoming vapour refrigerant into liquid by changing its phase and finally over here there is an expansion valve which expands the liquid refrigerant ammonia decreases the pressure and turns it into a cold chill low temperature low pressure liquid which will go to the evaporator so these major components together construct the vapour absorption refrigeration system all these components are connected together with these connecting pipes now let's start with the detailed function of the evaporator very cold chilled low temperature liquid ammonia coming out of the expansion valve enters into these evaporator coils through this connected pipe we all know that the main cooling effect or refrigeration effect always occurs in the evaporator so when this low-pressure very cold chilled low-temperature liquid ammonia will enter the evaporator coils it will absorb all the heat present in the surface of the evaporator coils by absorbing all the heat from the surrounding region of the evaporator coils this cold chilled liquid ammonia will turn into low-pressure ramonja vapor inside these coils and the surrounding surface of the evaporator will become cold by losing the heat to this liquid thus the cooling effect or refrigeration effect has occurred in the evaporator after that this low-pressure ammonia vapor will leave the evaporator and enter the absorber through this connecting pipe the absorber already has a weak solution of ammonia and water inside it and when this low-pressure ramonja vapor enters the absorber the water present in the weak solution of this absorber will start absorbing this ammonia vapor and the weak solution will gradually convert into a strong ammonia water solution the more ammonia vapor coming from the evaporator is absorbed by water from this weak solution the stronger this solution will become but when water absorbs ammonia vapor it also liberates heat that is when water will absorb the incoming ammonia vapor it will produce heat which will increase the temperature of the solution and when the solution becomes hot gradually the capacity of water to absorb ammonia decreases so to keep the temperature of this solution to an optimal level a supply of cool water is provided through this pipe so that this external supply of cool water through this pipe carries away heat from the solution and thus water regains the capacity to continuously absorb incoming ammonia vapor beside this absorber there is a pump now when power is provided then this pump starts working then using this pump this strong solution of ammonia and water will be pumped from this absorber to this generator so the function of this pump is to transfer the solution from the absorber to the generator we provide auxiliary heat or external heat to this generator either by using steam or hot water or any leader gas burner etc so when the solution of ammonia and water reaches the generator and heat is applied to this version from the external sauce both ammonia and water from this ammonia water solution turns into vapour inside this generator actually ammonia turns into vapour faster than water and water takes comparatively more time to completely turn into vapor but eventually both ammonia and water will turn into vapour when heat is provided now here we also have an analyzer on the top of this generator when this vapour of ammonia and water tries to pass through this analyzer only ammonia is allowed to pass through the analyzer continuously condenses the water vapour and sends water back to the generator this is because if water vapour enters the system it can decrease the efficiency of the refrigeration system or if larger quantity of water vapour enters the system then the system could be damaged thus the analyzer separates water particles from ammonia vapor and only lets ammonia to pass through to the next components through this pipe for further process and the analyzer sends water particles back to the generator then from this generator the residue weak solution of water and ammonia accumulated here will be passed back to the absorber again passing through this pressure reducing valve so here the high pressure high temperature pure ammonia vapor coming out of the generator will now enter into this condenser through this connected pipe here we have a condenser when high temperature high pressure ammonia vapour enters this cold condenser then the condenser absorbs the heat from the ammonia vapour and completely converts it into liquid this condenser can be either water cooled or air cooled or cooled by any other substance from an external source which will liberate the latent heat of this vapour coming into the condenser and thus condensing keeps happening now here we have an expansion valve after condensation liquid ammonia will leave the condenser and pass through this expansion valve now this high-pressure liquid ammonia coming from the condenser will be expanded inside this expansion valve we know that when expansion occurs the pressure between the molecules decrease considerably thus the temperature falls this high-pressure liquid ammonia will be expanded into low-pressure low-temperature liquid ammonia thus here we get very cold chilled low-temperature liquid ammonia coming out of the expansion valve then this liquid ammonia will be again passed over to the evaporator though this connected pipe way by absorbing all the heat from the surrounding region of the evaporator coils this cold chilled liquid ammonia will again turn into low-pressure ammonia vapor inside these coils and the surrounding region of the evaporator will become cold by losing the heat to this liquid then this low-pressure ammonia vapor will leave the evaporator and enter the absorber through this connecting pipe and the whole cycle will be repeated over and over again thus refrigeration or cooling will occur continuously in the evaporator region so this is how a vapour absorption refrigeration system works thank you for watching this video if this video was helpful subscribe to my channel academic gain tutorials for more updated videos