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Experimental and theoretical investigation of the performance of an air to water multi-pass heat pipe-based heat exchanger

机译：水多通热管式热交换器空气性能的实验与理论研究

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摘要

In this paper, the performance of a multi-pass heat pipe-based heat exchanger (HPHE) is investigated experimentally and theoretically. The heat pipe system consists of copper heat pipes in a specific equatorially staggered configuration to facilitate heat transportation from a hot gas (air) to a water flow, which cools the condenser section of these heat pipes. The effect of the Reynolds number on the heat transfer rate was studied by altering the number of passes for the evaporator section for the same system by the incorporation of various baffles and by varying the water flow rate. The experimental results have highlighted the strong correlation between heat exchanger performance and the Reynolds number. By increasing the number of passes from one to five, the effectiveness of the HPHE was improved by more than 25%. It has been demonstrated that increasing the number of passes increases the Reynolds number of the flow, leading to higher heat transfer coefficients and lower thermal forced convection resistances. The HPHE overall performance, as well as, the outlet temperatures of the fluids were predicted through two theoretical models, based on the Log Mean Temperature Difference (LMTD) method and the Effectiveness-Number of Transfer Units (epsilon-NTU) method. The predictions were compared with experimental results and the accuracy of the models reported. The validation showed that the developed iterative LMTD model predicted the performance of the HPHE within 15.5% error. In comparison, the epsilon-NTU model predicted the total effectiveness with a maximum error of 19% and was able to predict the outlet temperatures of both air and water streams within an accuracy of +/- 0.7 degrees C. The reported research is of importance for the application of heat pipe heat exchangers in waste heat recovery. Finally, knowledge is provided on the accuracy of the available prediction models. (C) 2020 Elsevier Ltd. All rights reserved.
机译：本文通过实验和理论地研究了多通热管的热交换器（HPHE）的性能。热管系统由特定赤道交错构造的铜热管组成，以便于从热气体（空气）到水流的热输送，这使得这些热管的冷凝器部分冷却。通过通过掺入各种挡板并改变水流速率来改变相同系统的蒸发器部分的通道的数量来研究雷诺数对传热速率的影响。实验结果突出了热交换器性能与雷诺数之间的强关系。通过增加一至五个通过的通过，HPHE的有效性提高了25％以上。已经证明，增加通过的数量增加了流动的雷诺数，导致较高的传热系数和较低的热强制反射电阻。通过两种理论模型，通过两种理论模型来预测流体的整体性能，以及流体的出口温度，基于对数平均温差（LMTD）方法和转移单元（EPSILON-NTU）方法的有效性 - 数量来预测流体的出口温度。将预测与实验结果进行比较，报告的模型的准确性。验证表明，发达的迭代LMTD模型预测了HPHE在15.5％误差范围内的性能。相比之下，EPSILON-NTU模型预测了最大误差为19％的总效果，并且能够在+/- 0.7摄氏度的准确度下预测空气和水流的出口温度。报告的研究具有重要性用于在废热回收中的热管热交换器的应用。最后，提供了可用预测模型的准确性的知识。 （c）2020 elestvier有限公司保留所有权利。

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  • 来源
    《Energy》 |2021年第15期|119624.1-119624.17|共17页
  • 作者

    Jouhara Hussam; Almahmoud Sulaiman; Brough Daniel; Guichet Valentin; Delpech Bertrand; Chauhan Amisha; Ahmad Lujean; Serey Nicolas;

  • 作者单位

    Brunel Univ London Coll Engn Design & Phys Sci Heat Pipe & Thermal Management Res Grp London UB8 3PH England;

    Spirax Sarco Engn PLC Cheltenham GL51 9NQ Glos England;

    Brunel Univ London Coll Engn Design & Phys Sci Heat Pipe & Thermal Management Res Grp London UB8 3PH England;

    Brunel Univ London Coll Engn Design & Phys Sci Heat Pipe & Thermal Management Res Grp London UB8 3PH England;

    Brunel Univ London Coll Engn Design & Phys Sci Heat Pipe & Thermal Management Res Grp London UB8 3PH England;

    Brunel Univ London Coll Engn Design & Phys Sci Heat Pipe & Thermal Management Res Grp London UB8 3PH England;

    Brunel Univ London Coll Engn Design & Phys Sci Heat Pipe & Thermal Management Res Grp London UB8 3PH England;

    Brunel Univ London Coll Engn Design & Phys Sci Heat Pipe & Thermal Management Res Grp London UB8 3PH England;

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  • 正文语种 eng
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  • 关键词

    Heat pipe heat exchanger; Multi-pass; Reynolds number; LMTD; Effectiveness-NTU;

    机译：热管换热器;多通;雷诺数;LMTD;有效性 - NTU;
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