基于两相流体网络的翅片管换热器仿真模型研究

Simulation of Fin-and-tube Heat Exchanger Based on Two-phase Fluid Network

基于两相流体网络 ,建立了针对具有复杂流路布置的翅片管换热器稳态通用分布参数仿真模型。模型考虑了实际换热器内部存在的翅片间导热 ,这使模型的建立假设更接近于实际的换热条件。通过对给定参数的实际换热器性能预测结果与实验结果对比分析表明 ,该模型和算法可以对具有复杂管排布置和连接方式的翅片管式换热器稳态性能进行仿真 (其仿真误差小于 5 % ) ,完全达到工程运用的要求。该模型可以用来预测和分析具有复杂制冷剂流路的翅片管换热器稳态性能。

A general steady distributed parameters mode l of fin-and-tube heat exchanger with complex refrigerant circuits was developed based on two-phase fluid network. Practicability and reliability of this model are improved by considering heat conduction through fins which exists in the ac tual heat exchanger. Performance of an actual heat exchanger with given paramete rs is evaluated according to the model and alternative algorithm of heat transfe r and pressure drop. This model and algorithm are suitable to simulate the perfo rmance of fin-and-tube heat exchanger with complex tube layout and connection. The maximum deviation between predicted values and experiment data lies within 5%, which is enough to meet the requirement of engineering application. Perform ance of fin-and-tube heat exchanger with complex refrigerant circuits can be e valuated and analyzed to apply this model.