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首页> 外文期刊>International Journal of Heat Exchangers >Transient-Based Technique for the Evaluation of Overall Heat Transfer Coefficient in a Concentric Tube Heat Exchanger
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Transient-Based Technique for the Evaluation of Overall Heat Transfer Coefficient in a Concentric Tube Heat Exchanger

机译：基于瞬态的同心管式换热器总传热系数评估技术

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摘要

The overall heat transfer coefficient of a heat exchanger can be evaluated using a steady state method, which is time consuming and involves long waiting time for steady state to be reached. In this paper, a transient-based technique, which provides speedy measurement, is presented. Finite Element Method together with Galerkin approach and implicit Euler method is used to solve energy equations of a concentric tube heat exchanger for the determination of the overall heat transfer coefficient by the transient-based technique. This technique can be used for a heat exchanger which can have either parallel flow or counter flow with equal or unequal mass flow rates involving liquid to liquid or liquid to gas heat transfer. The technique has been validated with analytical methods available in literature and verified with experimental results.
机译：可以使用稳态方法来评估热交换器的总传热系数，该方法耗时且需要很长的等待时间才能达到稳态。在本文中，提出了一种基于瞬态的技术，可以提供快速的测量。有限元方法与Galerkin方法和隐式Euler方法一起用于求解同心管式换热器的能量方程，从而通过基于瞬态的技术确定总传热系数。该技术可以用于热交换器，该热交换器可以具有平行流或逆流，其中质量流率相等或不相等，涉及液体到液体或液体到气体的热传递。该技术已通过文献中可用的分析方法进行了验证，并得到了实验结果的验证。

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