多工况下冷凝干燥换热器性能仿真研究(英文)

Simulation Research on Performance of Condensing Heat Exchanger in Different Working Conditions

目的对载人航天器温湿度控制系统所采用的冷凝干燥换热器的主要工作状态进行了研究,以便为设计提供更精确的计算方法。方法在对冷凝干燥换热器结构进行合理简化的基础上,建立相关的微元换热器数学模型,对干工况使用对数平均温差法计算,对湿工况使用能量、质量守恒方法计算。基于Matlab/Simulink软件使用打靶法求解模型方程组,得到了冷凝干燥换热器不同的工作状态及其对应的换热和除湿性能。结果分析结果表明,所建立的仿真模型能够较好地预测不同工况下冷凝干燥换热器的性能,仿真结果与物理现象接近。结论建立的仿真模型可用于载人航天器温湿度控制系统和飞机环境控制系统中采用的冷凝干燥换热器的研制与优化。

Objective To provide a more accurate calculation method for design of condensing heat exchanger （CHX） through an in depth discussion about working conditions of the CHX commonly used in temperature and humidity control system of manned spacecraft.Methods With difference of the simplified configuration of CHX,a mathematical model was given.Specifically,the log-mean temperature difference （LMTD） method was used in dry conditions,while in wet conditions mass and energy conservation equations were used.The set of equations of the model were solved by using the shooting method provided by Matlab/Simulink program.Results The results of working conditions and the performance of heat transfer and dehumidification of CHX were determined.Analysis showed that the simulation model could evaluate performance of the CHX in different work conditions reasonably and the results were close to the physical phenomenon.Conclusion The simulation models are of significance for design and optimization of CHX both in manned spacecraft temperature and humidity control system and in aircraft environmental control system.