Research on the heat transfer model of double U-pipe ground heat exchanger based on in-situ testing

IF 2.6 4区 工程技术 Q3 ENERGY & FUELS Frontiers in Energy Research Pub Date : 2024-08-29 DOI:10.3389/fenrg.2024.1442185
Ruifeng Wang, Mingchuan Shi, Ke Zhu, Jun Yu, Wei Ren, Guohong Yan, Zhiqiang Yin, Shujie Gao
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Abstract

The Double U-pipe ground heat exchanger, known for its simple process, cost-effectiveness, high heat exchange efficiency, and low thermal resistance, remains the predominant type of ground heat exchanger in today’s shallow geothermal energy development and utilization. In recent years, significant research has focused on the factors influencing heat transfer and the heat exchange performance of Double U-pipe ground heat exchangers through experimental testing methods. However, studies that integrate numerical simulation with in situ testing have been less common. Utilizing the cylindrical heat source model theory and the results of regional in situ thermal response tests, this paper develops a Double U-pipe ground heat transfer model by establishing physical, mathematical, and heat transfer geometric models. It evaluates the effects of varying inlet temperatures, flow rates, and initial ground temperatures on heat exchange efficiency under heating conditions. The results confirm the accuracy of the Double U-pipe ground heat exchanger model based on in situ testing. They indicate that increasing the temperature differential between the inlet and initial temperatures, raising the initial ground temperature, and moderately enhancing the flow rate can improve the system’s heat exchange efficiency.
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基于原位测试的双 U 型管地面换热器传热模型研究
双 U 管地热交换器以其工艺简单、成本效益高、热交换效率高、热阻小而著称,仍是当今浅层地热能开发利用中最主要的地热交换器类型。近年来,通过实验测试方法对双 U 型管地热交换器的传热影响因素和热交换性能进行了大量研究。然而,将数值模拟与现场测试相结合的研究却并不多见。本文利用圆柱热源模型理论和区域原位热响应测试结果,通过建立物理、数学和传热几何模型,开发了双 U 型管地面传热模型。它评估了在供暖条件下,不同的入口温度、流速和初始地温对热交换效率的影响。结果证实了基于现场测试的双 U 型管地热交换器模型的准确性。结果表明,增大入口温度与初始温度之间的温差、提高初始地温以及适度提高流速可以提高系统的热交换效率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Frontiers in Energy Research
Frontiers in Energy Research Economics, Econometrics and Finance-Economics and Econometrics
CiteScore
3.90
自引率
11.80%
发文量
1727
审稿时长
12 weeks
期刊介绍: Frontiers in Energy Research makes use of the unique Frontiers platform for open-access publishing and research networking for scientists, which provides an equal opportunity to seek, share and create knowledge. The mission of Frontiers is to place publishing back in the hands of working scientists and to promote an interactive, fair, and efficient review process. Articles are peer-reviewed according to the Frontiers review guidelines, which evaluate manuscripts on objective editorial criteria
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