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Modelling of elastocaloric regenerators with enhanced heat transfer structures

机译：增强传热结构弹性再生器的建模

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摘要

The elastocaloric refrigeration utilizing Shape Memory Alloys (SMAs) has been actively pursued as an alternative cooling technology to the traditional vapor compression. Many research efforts have been focusing on the thermomechanical cycles, material properties, and fatigue life of the SMAs. However, less effort has been made to achieve optimal heat transfer performance of the entire system. In this work, for the first time, we introduce a porous regenerative heat exchanger to a tube-based compression-loaded elastocaloric cooling device for enhanced cooling performance without compromising its fatigue life. A convective regenerator made of a porous structure is proposed for better thermal coupling between the nickel-titanium (Ni-Ti) tube and the heat transfer fluids. A quasi-1D numerical model has been developed to predict the elastocaloric cooling performance and optimize the heat transfer structures. We demonstrate, at specific operating conditions, the optimized elastocaloric regenerator design can improve the Specific Cooling Power (SCP) and Coefficient of Performance (COP) by 50% and 45%, respectively, as compared to a bare tube design. The numerical framework developed in this work offers a systematic investigation of complex regenerative heat exchanger systems and a detailed understanding of the design parameters that are vital for prototype development.
机译：利用形状记忆合金（SMA）的弹性制冷被激活为传统蒸汽压缩的替代冷却技术。许多研究努力专注于SMA的热机械循环，材料特性和疲劳寿命。然而，已经减少努力来实现整个系统的最佳传热性能。在这项工作中，我们首次将多孔再生热交换器引入基于管的压缩加载弹性冷却装置，以增强冷却性能而不会影响其疲劳寿命。提出了一种由多孔结构制成的对流再生器，用于更好地在镍 - 钛（Ni-Ti）管和传热流体之间的热耦合。已经开发了一种准1D数值模型来预测弹性冷却性能并优化传热结构。我们在具体的操作条件下，优化的弹性传动器设计可以分别将特定的冷却功率（SCP）和性能系数（COP）和45％分别改善50％和45％，与裸管设计相比。本工作中开发的数值框架提供了对复杂再生热交换器系统的系统调查，并详细了解对原型开发至关重要的设计参数。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第9期|121372.1-121372.12|共12页
  • 作者

    Yuxiang Zhu; Jun Hur; Siyuan Cheng; Qingping Sun; Weihong Li; Shuhuai Yao;

  • 作者单位

    Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Hong Kong China;

    Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Hong Kong China;

    Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Hong Kong China;

    Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Hong Kong China;

    Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Hong Kong China HKUST Jockey Club Institute for Advanced Study The Hong Kong University of Science and Technology Hong Kong China;

    Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Hong Kong 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

    Elastocaloric cooling; Regenerative heat exchanger; Porous structure; Optimization;

    机译：弹性冷却;再生热交换器;多孔结构;优化;

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