基于遗传算法和Aspen Plus的二级自动复叠制冷系统建模分析和优化  

Modeling analysis and optimization of two-stage automatic cascade refrigeration system based on genetic algorithm and aspen plus

作　　者：胡姣姣 张华[1] 徐琳娇 HU Jiao-jiao;ZHANG Hua;XU Lin-jiao(Institute of Refrigeration and Cryogenics Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学制冷与低温工程研究所

出　　处：《能源工程》2019年第6期91-97,共7页Energy Engineering

摘　　要：采用Aspen Plus中的序贯模块法撕裂物流,模拟二级自动复叠系统。理论分析采用Visual Basic for Application(VBA)编写遗传算法,通过ActiveX技术将VBA与Aspen Plus进行对接,通过改进的自适应度遗传算法对循环进行寻优,将循环的热力学完善度作为目标函数,并引入惩罚函数得到适应度函数;优化了不同蒸发温度、冷凝温度、压缩机压比下循环在热力学完善度最高时的制冷工质配比,为实际自动复叠制冷系统设计和制冷剂充注提供理论数据。仿真生成了蒸发冷凝器温度与换热量曲线,发现最优时第一级蒸发冷凝器传热窄点在热流体出口处,而第二级蒸发冷凝器传热窄点在换热器中部和热流体出口处。Mixing ratio was an important parameter of automatic cascade refrigeration system and different ratios had great influence on the overall performance of the system.In order to optimize the mixing ratio and improve the system performance,the sequential module method tearing logistics in Aspen Plus was used to simulate the two-stage automatic cascade system.In the theoretical analysis,the genetic algorithm was written by Visual Basic for Application,and VBA was connected with Aspen Plus through ActiveX technology.The cycle was optimized by the improved adaptive genetic algorithm,in which the thermodynamic perfection of the cycle was taken as the objective function,and the fitness function was obtained by the introduction of the penalty function.The ratios of refrigerants with different evaporative temperatures,condensing temperatures and compressor pressure ratios at the highest thermodynamics perfectability were optimized,which provided theoretical data for the design of actual automatic cascade refrigeration systems and refrigerant charging.The temperature and heat transfer curves of the evaporative condenser at the optimal condition were generated.It was found that the first stage evaporator condenser had a pinch point at the hot flow exit,while the second stage evaporator condenser had two pinch points which are at the middle of the heat exchanger and at the hot flow exit.

关 键 词：自动复叠系统 非共沸混合工质 遗传算法 Aspen Plus 优化 建模分析 

分 类 号：TB61[一般工业技术—制冷工程]