[关键词]
[摘要]
混合工质配比是自动复叠制冷系统重要参数,不同的配比对系统的整体性能影响很大。为了优化混合工质配比,提高系统性能,本文采用Aspen Plus来模拟自动复叠制冷系统,将遗传算法与混合工质的配比选取结合,以系统热力学完善度最高为目标函数进行优化,得出了不同蒸发器出口温度、冷凝器出口温度、压缩机压比时系统性能最优时混合工质的质量配比,为实际自动复叠制冷系统设计和制冷剂充注提供了理论数据。将一组三级自动复叠制冷系统的实验值与模拟值进行对比,发现模拟值与实验值的误差多数都在10%以内。
[Key word]
[Abstract]
Mixing ratio is an important parameter of automatic cascade refrigeration system and different ratios have great influence on the overall performance of the system. In order to optimize the mixing ratio and improve the performance of the system, Aspen Plus is used to simulate the automatic cascade refrigeration system, combining the genetic algorithm and the mixed working medium, and optimizes the system thermodynamics with the highest objective degree. The mass ratio of mixed refrigerants with different evaporator outlet temperature, condenser outlet temperature and compressor pressure ratio is obtained, which provides theoretical data for the actual automatic cascade refrigeration system design and refrigerant charging. Comparing the experimental values of a set of three-stage automatic cascade refrigeration system with the simulated values, it is found that the error between the simulated value and the experimental value is mostly within 10%.
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