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Aroace units’ operating principle Generator - The water fed in heats the dilute lithium bromide and water solution contained in the generator to boiling point. Boiling releases water vapour (refrigerant) and strengthens the lithium bromide solution. The concentrated solution is collected and precooled, by being passed through a heat exchanger, prior to being fed into the absorber. Condenser - The refrigerant vapour reaches the condenser, where it condenses on the surfaces of the chilling circuit coils. The condensation heat is removed by the cooling water and exhausted through the evaporation tower. The refrigerant liquid collected in the condenser is then fed into the evaporator through the opening provided for the purpose. Evaporator - The influence exerted by the absorber makes the pressure inside the evaporator substantially lower than the generator and condenser pressure. Once inside the evaporator, the refrigerant liquid thus boils and absorbs heat, evaporating on the surface of the coil in the circuit containing the water to be chilled. The refrigerant vapour thus obtained thus flows into the absorber. Absorber - The low pressure in the absorber is due to the chemical affinity between the concentrated lithium bromide solution supplied by the generator and the refrigeration vapour that forms in the evaporator. The refrigerant vapour is absorbed by the concentrated lithium bromide solution as the latter bathes the surface of the absorber coil. The condensation and dilution heat is drawn off by the cooling water. The dilute lithium bromide solution is then preheated in the heat exchanger prior to being returned to the generator. |
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