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A dynamic model for predicting condensation heat and mass transfer characteristics in falling film condenser

机译：用于预测叶片冷凝器中冷凝热和传质特性的动态模型

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摘要

A mathematical model of falling film condenser is developed to predict the dynamic response of shell-and-tube condenser having R1233zd(E) as refrigerant for high temperature heat pump systems. The model incorporates a vapor-mass-flux ratio, which includes the relative velocity slip between vapor and liquid to examine the performance of tube bundles in falling film condensers. Discretization of governing equations and control-volumes method are applied to construct the dynamic model which is first validated with the well-known HTRI software in steady-state performance. The mean relative deviations are within 14.8% for temperature and 2.0% for heating capacity in steady state. The established model can be used to predict the dynamic heat transfer response to the change of operating conditions and geometric configurations of tubing. When compared to the change of inlet pressure of vapor refrigerant, the response of the condensation temperature is much slower, yielding some 1.7 times longer time to reach stable state than that of pressure. Further, various heat exchange tubes (smooth tubes and low-fin tubes with 3 different fin pitches) are examined. It is found that the heating capacity and water outlet temperature increase with the rise of fin density. Yet higher fin density also tends to reach stable state earlier. The heat transfer enhancement ratio ranges from 2.7 to 2.0 for low-fin tube with 1.3 mm fin pitch, and the enhanced tubes are more effective with the low subcooling temperature.
机译：开发了落膜冷凝器的数学模型，以预测具有R1233ZD（E）作为高温热泵系统的制冷剂的壳管冷凝器的动态响应。该模型包括蒸汽质量磁通率，其包括蒸汽和液体之间的相对速度滑移，以检查管束在下降薄膜冷凝器中的性能。应用了管理方程和控制卷方法的离散化来构造动态模型，该动态模型在稳态性能中首次用众所周知的HTRI软件验证。平均相对偏差在温度范围内以内的14.8％，在稳态中加热容量为2.0％。建立的模型可用于预测对操作条件的变化和管道的几何构造的动态传热响应。与蒸汽制冷剂的入口压力的变化相比，冷凝温度的响应较慢，从而达到稳定状态的较长时间比压力稳定的约1.7倍。此外，检查各种热交换管（平滑管和具有3种不同翅片间距的低翅片管）。结果发现，随着翅片密度的升高，加热容量和水出口温度升高。然而，更高的鳍密度也倾向于更早地达到稳定的状态。具有1.3mm翅片间距的低翅片管的传热增强比率为2.7至2.0，并且增强管对低过冷温度更有效。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第9期|121434.1-121434.11|共11页
  • 作者

    Jiatong Jiang; Bin Hu; R.Z. Wang; Hua Liu; Zhiping Zhang; Hongbo Li;

  • 作者单位

    Institute of Refrigeration and Cryogenics&Engineering Research Center of Solar Power & Refrigeration Shanghai Jiao long University Shanghai 200240 China;

    Institute of Refrigeration and Cryogenics&Engineering Research Center of Solar Power & Refrigeration Shanghai Jiao long University Shanghai 200240 China;

    Institute of Refrigeration and Cryogenics&Engineering Research Center of Solar Power & Refrigeration Shanghai Jiao long University Shanghai 200240 China;

    Institute of Refrigeration and Cryogenics&Engineering Research Center of Solar Power & Refrigeration Shanghai Jiao long University Shanghai 200240 China SKL of Air-Conditioning Equipment and System Energy Conservation GREE Electric Appliances INC. Zhuhai 519070 China;

    SKL of Air-Conditioning Equipment and System Energy Conservation GREE Electric Appliances INC. Zhuhai 519070 China;

    SKL of Air-Conditioning Equipment and System Energy Conservation GREE Electric Appliances INC. Zhuhai 519070 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Falling film simulation; Dynamic condensation model; Vapor-mass-flux ratio; Enhanced heat transfer; R1233zd(E);

    机译：落叶电影模拟;动态凝结模型;蒸气质量磁通率;增强的传热;R1233ZD（e）;

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