Research On Power/Cooling Cogeneration Absorption Cycle

Absorption power/cooling cogeneration cycle using ammonia-water can use middle and low taste of energy/which is very to save energy, to recover waste energy and to lower the pollution of environment.Absorption power/cooling cogeneration cycle using ammonia-water is based on ammonia-water absorption cooling cycle, so this paper studies ammonia-water absorption cooling system not only experimentally but also theoretically. In addition, improvement and thermodynamic analysis approach about the cycle which is combined with power and cooling are also explored and studied.Running state about the refrigeration machine is known through the debugging experiment, including the heat resource temperature and cooling water temperature difference when entering and leaving, cooling temperature, and refrigerating capacity in rated situation. Problem of the machine is analyzed and summarized, and the method about how to improve the performance is also proposed. A series of experiment are carried out to test the cooling machine performance after improvement is finished, including efforts of unfrozen liquid flow, temperature, and cooling water flow on refrigerating capacity and coefficient of performance, and how cooling water flow affect temperature of absorber and condenser. So, maneuvering condition and the best state about the cooling machine is known better.The refrigeration system is analyzed using Aspen Plus flowsheet simulator. The results are compared with experimental data. Among performance parameters analyzed are temperature and flow of ammonia-water, heat duties of the evaporator, absorber, and the condenser, and flow of unfrozen liquid and cooling water. In general, a very good agreement between the simulator's results and the experimental measurements was found, especially heat duties of absorber and the condenser. In addition, some of maneuvering condition been investigated in this work by Aspen Plus flowsheet simulator, including efforts of heat duty of generator, generating pressure and basic liquid concentration on refrigerating capacity and coefficient of performance, which are not accomplished through the cooling machine.Absorption system combined Power and Cooling cycle (APC) is analyzed using the pinch point analysis, some improper place is found from pinch analysis by the relate of the temperature to enthalpy, two new cycle is proposed to recycle energy to improve the performance. especially the second cycle whose pinch moves to high temperature from low temperature. A good match between the cold and the hot is observed from the new pinch analysis scheme. exergy analysis are used to prove the effort again. Additional 175.4 kW power and 61.8 kW refrigerating capacity are obtained, loss of exhaust gas decrease to 645.3 kW, and exergy efficiency increase to 0.504 from 0.397.