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首页> 外文期刊>International Journal of Refrigeration >Distributed steady and dynamic modelling of dry-expansion evaporators
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Distributed steady and dynamic modelling of dry-expansion evaporators

机译：干式膨胀蒸发器的分布稳态和动态模型

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A general distributed parameter model is presented to describe both steady and dynamic behaviors of dry-expansion evaporators. The homogeneous and three different non-homogeneous two-phase flow models are used to evaluate the impact of differentflow models on the accuracy of the simulation. The experimental work was carried out on a full-scale refrigeration system with R- 134a as the working fluid and without frost formation at the evaporator. Comparison between the modeling and experimentalmeasurements shows that the drift flux flow models give satisfactory predictions. The simulation results indicate that an even air temperature distribution off the evaporator may be obtained by controlling liquid dry-out point at the two ends of the coil. The study also indicates that the counterflow configuration provides a higher heat exchange efficiency with a slower transient response compared with the cocurrent-flow configuration. A general distributed parameter model is presented to describe bothsteady and dynamic behaviors of dry-expansion evaporators. The homogeneous and three different non-homogeneous two-phase flow models are used to evaluate the impact of different flow models on the accuracy of the simulation. The experimental work wascarried out on a full-scale refrigeration system with R- I 34a as the working fluid and without frost formation at the evaporator. Comparison between the modeling and experimental measurements shows that the drift flux flow models give satisfactorypredictions. The simulation results indicate that an even air temperature distribution off the evaporator may be obtained by controlling liquid dry-out point at the two ends of the coil. The study also indicates that the counterflow configuration provides a higher heat exchange efficiency with a slower transient response compared with the cocurrent-flow configuration.
机译：提出了一个通用的分布参数模型来描述干式膨胀蒸发器的稳态和动态行为。均质和三种不同的非均质两相流动模型用于评估不同流动模型对模拟精度的影响。实验工作是在以R- 134a为工作流体且在蒸发器上没有结霜的大型制冷系统上进行的。建模和实验测量结果的比较表明，漂移通量流模型给出了令人满意的预测。仿真结果表明，通过控制盘管两端的液体变干点，可以使蒸发器外的空气温度分布均匀。研究还表明，与并流配置相比，逆流配置可提供更高的热交换效率和更慢的瞬态响应。提出了一个通用的分布参数模型来描述干式膨胀蒸发器的稳态和动态特性。均质和三种不同的非均质两相流动模型用于评估不同流动模型对模拟精度的影响。实验工作是在具有R-I 34a作为工作流体且在蒸发器上没有结霜的全尺寸制冷系统上进行的。建模与实验测量结果的比较表明，漂移通量流动模型给出了令人满意的预测。仿真结果表明，通过控制盘管两端的液体变干点，可以使蒸发器外的空气温度分布均匀。研究还表明，与并流配置相比，逆流配置可提供更高的热交换效率和更慢的瞬态响应。

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