Dynamic Simulation Of The Carbon Dioxide Heat Pump Evaporator

At present, the theoretical and experimental research at home and abroad for carbon dioxide heat pump system theory research has gradually been deeper, but how to improve system performance, optimization the match between components and keep the real-time running of the system in the optimal state is the key question that needed to solve to march to substantiate.In this paper using carbon dioxide heat pump system as the research object, combining the method of theoretical analysis and simulation studies,the research mainly contains the operational parameters that affect system performance increase and discharge temperature, the irreversible loss of system components, the solved problem to achieve optimal pressure control by means of system dynamic simulation and the evaporator dynamic characteristics for system optimum pressure control.From the angle of the thermodynamics of carbon dioxide heat pump system, with the theoretical method this article analyzes the computing method of system performance and the influence parameters of system performance, using simulation method concretely analyzes the influence of each operation parameters on system performance.Combining the theoretical analysis and verification of simulation, this conclusion is proved that carbon dioxide heat pump system exists optimal pressure.According to the characteristics of carbon dioxide heat pump system, the optimal pressure control method is suitable for this system control,dynamic simulation method that is used for researching operation effect of carbon dioxide heat pump system in the most optimal pressure control method is proposed, and analysing the main solved problems is to realize simulation control system.At last, the adjustable scope of system discharge pressure in actual operation is studied.Evaporator dynamic simulation model which is suitable for the control simulation of carbon dioxide heat pump system is established. Based on the steady-state simulation, when external disturbance occurs, the dynamic responses of other system components relevant parameters and the performance parameters of evaporator itself are studied.The research works in this article have the certain reference value on system performance increase and dynamic characteristic research for carbon dioxide heat pump system under the optimum pressure control.