Modelling and Simulation of the Freezing Systems and Heat Pumps Using Unisim ® Design C
Abstract—The paper describes the modeling and simulation of the heat pumps domain processes. The main objective of the study is the use of the heat pump in propene–propane distillation processes. The modeling and simulation instrument is the Unisim® Design simulator. The paper is structured in three parts: An overview of the compressing gases, the modeling and simulation of the freezing systems, and the modeling and simulation of the heat pumps. For each of these systems, there are presented the Unisim® Design simulation diagrams, the input–output system structure and the numerical results. Future studies will consider modeling and simulation of the propene–propane distillation process with heat pump.
Specific Problems of Using Unisim Design ® in the Dynamic Simulation of the Propylene-Propane Distillation Column
The paper analyzes the principles and particularities of using Unisim Design® environment in the dynamic modelling and simulation of chemical processes. The paper presents the four stages of configuration and simulation of the distillation process: steady-state modelling and simulation of the process, particularities of dynamic model configuration for propylene-propane distillation column, configuration of control structure for separated products quality, and dynamic simulation of propylene-propane distillation column. There are also presented the results of dynamic simulation of propylene-propane separation process with L-B structure for separated products quality control. The obtained results validate Unisim Design® as a powerful tool in dynamic simulation of distillation processes control systems.
Frequency selective surface design for blinds applications
In this paper, the reconfigurable blind structure with frequency selective surfaces(FSS) for the building applications are presented. Frequency transmission characteristics for different angles of the proposed blind-FSSs are investigated and verified through simulation and measurement. The simulation results show that we can implement the reconfigurable blind-FSS for multiband wireless applications. To verify the proposed paper, two kinds of blind-FSSs, crossed dipole FSS and circular ring FSS are fabricated and measurements are performed for different angles. The proposed structure in this paper which is very simple, can be easily applied to any planar surface for wireless security applications at low cost.