对安装在水平地缘热交换器上的螺旋叶片几何参数影响的数值研究

IF 3.5 2区 工程技术 Q3 ENERGY & FUELS Geothermics Pub Date : 2024-09-18 DOI:10.1016/j.geothermics.2024.103169
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引用次数: 0

摘要

在这项研究中,我们探讨了如何提高水平地热换热器的热效率,该换热器在管道外部装有螺旋翅片,内部装有带肋涡轮。我们的研究重点是通过创新的设计改造,研究几何形状与热效率之间的相互作用。利用有限元方法,三维数值模拟评估了不同几何参数(如翅片直径和厚度)的影响。我们的研究结果表明,增加螺旋形散热片后,传热效率明显提高;具体而言,将散热片直径从 5 毫米增加到 10 毫米后,传热率提高了 15%,而将散热片厚度从 2 毫米增加一倍到 4 毫米后,传热率提高了 10%。这些改进都是由于扩大了表面积,促进了更大的热交换。使用可取函数法进行优化后,模型的性能很高,出口温度的可取分数达到 0.9879,传热系数达到 0.9534。这反映出通过有效调整几何参数,实现了热性能的最大化。该研究还引入了两个预测数学模型,用于预测配备这些增强功能的 U 型管道的出口温度和对流传热系数。这些模型源自大量数值数据,为地热换热器未来的设计和运行应用提供了实用工具。这项研究提高了地热换热系统的设计和运行效率,通过可操作的见解和强大的数学工具为该领域的热效率建立了新的基准。
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Numerical investigation of the geometric parameters effect of helical blades installed on horizontal geo heat exchanger

In this study, we investigate the enhancement of horizontal geothermal heat exchangers equipped with helical fins on the pipe's exterior and internally ribbed turbulators. Our approach focuses on the interplay between geometry and thermal efficiency through innovative design modifications. Utilizing the finite element method, three-dimensional numerical simulations assessed the effects of varying geometric parameters such as the diameter and thickness of the fins. Our findings indicate significant increases in heat transfer efficiency with the addition of helical fins; specifically, increasing the fin diameter from 5 mm to 10 mm results in a 15 % increase in the heat transfer rate, while doubling the fin thickness from 2 mm to 4 mm enhances the rate by 10 %. These improvements are due to the expanded surface area facilitating greater heat exchange. Optimization using the desirability function approach yielded models with high performance, achieving desirability scores of 0.9879 for outlet temperature and 0.9534 for the heat transfer coefficient. This reflects the effective tuning of geometric parameters to maximize thermal performance. The study also introduces two predictive mathematical models for the outlet temperature and convective heat transfer coefficient of the U-shaped pipe equipped with these enhancements. These models, derived from extensive numerical data, provide practical tools for future design and operational applications of geothermal heat exchangers. This research advances the design and operational efficiency of geothermal heat exchange systems, establishing new benchmarks for thermal efficiency in the field with actionable insights and robust mathematical tools.

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来源期刊
Geothermics
Geothermics 工程技术-地球科学综合
CiteScore
7.70
自引率
15.40%
发文量
237
审稿时长
4.5 months
期刊介绍: Geothermics is an international journal devoted to the research and development of geothermal energy. The International Board of Editors of Geothermics, which comprises specialists in the various aspects of geothermal resources, exploration and development, guarantees the balanced, comprehensive view of scientific and technological developments in this promising energy field. It promulgates the state of the art and science of geothermal energy, its exploration and exploitation through a regular exchange of information from all parts of the world. The journal publishes articles dealing with the theory, exploration techniques and all aspects of the utilization of geothermal resources. Geothermics serves as the scientific house, or exchange medium, through which the growing community of geothermal specialists can provide and receive information.
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