Simulation And Optimization Of Industrial Waste Heat Ammonia Absorption Refrigeration System

At present, China’s energy efficiency is relatively low, a large number of industrial waste heat to smoke, gas and other forms of emissions into the atmosphere, which makes energy caused a huge waste; at the same time due to the improvement of people’s living standards, the demand for air conditioning and cold storage of food,drugs are rapid growth, which would has brought great pressure on resources and the environment. It is high significant value that industrial waste heat drive absorption refrigeration system.In this thesis, industrial waste heat driven ammonia absorption refrigeration system is studied. System parameters are optimized under the system cost is not increased, thereby industrial waste heat ammonia absorption refrigeration system cooling efficiency has been improved.Firstly,we aimed at the problem that is the speed of the look-up table slowly and get bigger error of NH3-H2O physical parameters.we compiled with VC++software for calculation of thermophysical properties of ammonia, it can quickly calculate thermophysical parameters of ammonia and lay the foundation for optimization of refrigeration system.Secondly, the various parts of the industrial waste heat NH3-H2O absorption refrigeration system is modeled,VC++is used to write the calculation software, the software can calculate each state point of thermodynamic parameters of system, material balance, heat balance, equipment heat load, the main consumption index.According to the calculation results of the system state parameters, this thesis analyzes the refrigeration temperature, cooling water temperature, the hot end temperature difference of the generator,the hot end temperature difference of the condenser, temperature difference of evaporator, the cold end temperature difference of the absorber and the solution heat exchanger,the impact of industrial waste heat NH3-H2O absorption refrigeration system.Finally, coordinate rotation method was used to comply with the system parameter optimization software. The objective function of the software is the largest system Coefficient of Performance, minimum heat transfer area and the minimum area performance ratio.The software optimizes the following parameters,they are the refrigeration temperature, cooling water temperature, the hot end temperature difference of the generator,the hot end temperature difference of the condenser, temperature difference of evaporator, the cold end temperature difference of the absorber and the solution heat exchanger. By comparative analysis of results, when optimization goal for the minimum area performance ratio, the optimization results can fully reflect the overall performance of the system.