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首页> 外文期刊>International Journal of Refrigeration >An advanced nonlinear switched heat exchanger model for vapor compression cycles using the moving-boundary method
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An advanced nonlinear switched heat exchanger model for vapor compression cycles using the moving-boundary method

机译：基于移动边界方法的蒸气压缩循环的高级非线性开关换热器模型

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摘要

Simulation is commonly used to develop control and diagnostic algorithms. Because vapor compression cycles are essentially heat management devices, transient and steady-state heat exchanger performance must be predicted accurately. However, for hardware- and software-in-the-loop purposes, the simulation must run in real-time. To reconcile these competing needs, a new lumped parameter or moving-boundary heat exchanger model was created. Accuracy concerns are addressed by including finned surfaces, nonlinear air temperature distributions, and non-circular passages. In its current form, the model is applicable to single pass, cross-flow heat exchangers. The mathematical basis of the model is given and shown to be consistent with integral forms of the energy and continuity equations. Although known to be more computationally efficient than finite volume models, moving-boundary models become singular and fail under certain conditions. To address this shortcoming, particular attention was focused on algorithms for switching between different representations and rezoning wall temperatures. Robustness to changing flow regimes is demonstrated through simulation test cases, and model application to a chiller system is shown. As such, the model provides improved accuracy, robustness, and operating range while maintaining real-time capability.
机译：仿真通常用于开发控制和诊断算法。由于蒸汽压缩循环本质上是热管理设备，因此必须准确预测瞬态和稳态热交换器的性能。但是，出于硬件和软件在环的目的，仿真必须实时运行。为了协调这些竞争需求，创建了一个新的集总参数或移动边界热交换器模型。通过包括翅片表面，非线性空气温度分布和非圆形通道来解决精度问题。在当前形式下，该模型适用于单程横流热交换器。给出了该模型的数学基础，并证明与能量和连续性方程的积分形式是一致的。尽管众所周知，移动边界模型在计算上比有限体积模型更有效，但它们在某些情况下变得奇异并失效。为了解决该缺点，特别关注了在不同表示形式之间进行切换并重新分配壁温的算法。通过模拟测试案例展示了对改变流动状态的鲁棒性，并展示了其在冷却器系统中的应用。这样，该模型在保持实时功能的同时提供了改进的准确性，鲁棒性和工作范围。

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