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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 study the main working conditions of the condensing drying heat exchanger used in the manned spacecraft temperature and humidity control system in order to provide a more accurate calculation method for the design. Methods Based on the reasonably simplification of the structure of the condensing drying heat exchanger, the relevant mathematical models of the micro heat exchanger were established. The logarithmic average temperature difference method was used to calculate the dry working conditions. The wet working conditions were calculated using the energy and mass conservation methods . Based on the Matlab / Simulink software, the shooting target method is used to solve the model equations, and the different working states and corresponding heat transfer and dehumidification performances of the condensing drying heat exchanger are obtained. The results of the analysis show that the simulation model established can better predict the performance of the condensing-drying heat exchanger under different working conditions, and the simulation results are close to the physical phenomena. Conclusion The simulation model can be used in the development and optimization of the condensing and drying heat exchanger used in the manned spacecraft temperature and humidity control system and aircraft environment control system.