Direct Fired Absorption Chiller Chilling Cycle

Direct Fired Absorption Chiller Chilling Cycle Points : direct fired absorption chiller chilling cycle Lithium Bromide solution with proper temperature and density shows very low saturation vapor pressure to the same temperature refrigerant (water). It is possible to absorb refrigerant vapor to lithium bromide solution using the difference of the saturation pressure. Such a refrigerant vapor latent heat is used for cooling.

The chilling cycle, is high vacuum single body consisting of 1. Evaporator, 2 Absorber, 3 Second stage generator, 4 Condenser 5, First stage generator 6, High temperature heat exchanger. 7 Low temperature heat exchanger. 8 Solution pump, 9 Refrigerant pump etc. The chilled water for air conditioning and cooling shall cool down by evaporation latent heat of refrigerant liquid (water) when traveling the evaporator tube. Evaporated refrigerant vapor flows into the abs9rber to be absorbed into lithiumbrornide solution, The absorption heat shall disappear by cooling water flowing inside, the absorber tube. Consequently the temperature in the absorber always keeps constant. Lithium bromide solution which has been cooled down and diluted in absorber, shall be heated at low temperature heat exchanger by high temperature and high density Lithium bromide solution, and then move to First stage generator through Second stage generator and high temperature heat exchanger. Diluted Lithium Bromide solution shall be introduced to First stage generator and heated by combustion gas to generate high temperature refrigerant vapor and become high temperature concentrated solution. Meantime the solution, which has returned to Second stage generator, shall be heated by refrigerant vapor of First stage generator shall mix with the solution concentrated in Second stage generator through high temperature neat exchanger to return to the absorber through low temperature heat exchanger. In the meantime both the refrigerant to heat second stage generator and the one to generate in Second stage generator shall cool down to be condensed by cooling water in the condenser. The condensed refrigerant shall he introduced to the evaporator by gravity and pressure difference to make necessary chilled water. Heating Cycle The water is heated by the condensation latent heat of refrigerant vapor generated by heating Lithium Bromide solution. Refrigerant vapor, which is generated in First stage generator, travels to inner heat transfer pipe to heat outer solution of heat transfer pipe and refrigerant vapor shall be condensed to return to Second stage generator.

Meantime the heated solution generates refrigerant vapor inside Second stage generator and refrigerant vapor travels to the condenser to exchanger the heat with hot water inside heat transfer pipe, and refrigerant vapor shall be condensed to return to the evaporator.

The refrigerant inside the evaporator is supplied by refrigerant pump to mix with Lithium Bromide solution of the absorber and supplied to the heat exchanger again by the solution to exchange heat with high density solution to be divided and supplied to both First stage generator and Second stage generator respectively. The solution generated in First stage generator and Second stage generator returns to the absorber in the same channel as that of chilling cycle and exchange heat with hot water.