Multi-segmented tube design and multi-objective optimization of deep coaxial borehole heat exchanger

Yongqiang Luo, Junhao Shen, Yixiao Song, Qingyuan Liu, Fulei Huo, Zhanpeng Chu, Zhiyong Tian, Jianhua Fan, Ling Zhang and Aihua Liu

Renewable Energy, 2024, vol. 237, issue PA

Abstract: Deep coaxial borehole heat exchanger (DCBHE) is a key component to extract medium-deep geothermal energy for low-carbon building heating. It is a convention that both center tube and annuals tube are respectively using a single material. However, a basic idea behind this study is using non-linear design to ask for performance improvement. It is assumed that non-uniform tube design pattern can meet different heat exchanger demand at different depth under a geothermal gradient dominated underground environment. The whole study is to prove this conjecture and make it useful for engineering application. A new numerical model is put forward to considered multi-segmented structure in heat transfer computation and a nondominated sorting genetic algorithm (NSGA-Ⅱ) is adopted in optimization process. The results of this study show that the optimized designed case can increase outlet temperature by 3 °C while reducing investment of 10000RMB. In addition, a home-made software is developed to perform the thermal and economic evaluation of DCBHE as well as automatically optimization of this multi-segmented structure. This study can provide a new model, algorithm, results and software tool for better utilizations of deep geothermal energy.

Keywords: Optimization study; Deep borehole heat exchanger; Center tube; Numerical simulation (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:237:y:2024:i:pa:s0960148124015623

DOI: 10.1016/j.renene.2024.121494

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