Previous mode switching algorithms for heat exchanger moving boundary models in the literature are composed of a set of IF-THEN rules. These representations could lead to numerical challenges due to the inherited discontinuities associated with IF-THEN rules. This paper presents an alternative mode switching methodology which results in a continuous moving boundary heat exchanger model over all possible mode changes. Numerical performance of the proposed method for a heat exchanger has been tested using simulations and sample results are compared with a moving boundary model with switching based on IF-THEN rules and also a finite-volume method. The proposed switching algorithm was implemented within a complete vapor compression cycle model and results were compared with experimental data for a start-up transient.

文献中用于热交换器移动边界模型的先前模式切换算法由一组IF-THEN规则组成。由于与IF-THEN规则相关的继承的不连续性，这些表示可能会导致数值挑战。本文提出了一种替代模式切换方法，该方法可在所有可能的模式变化上产生连续移动边界热交换器模型。通过仿真测试了所提出的热交换器方法的数值性能，并将样本结果与基于IF-THEN规则进行切换的运动边界模型以及有限体积方法进行了比较。所提出的转换算法在完整的蒸气压缩循环模型中实施，并将结果与​​启动瞬态的实验数据进行了比较。