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

Author

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

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.

Suggested Citation

  • Luo, Yongqiang & Shen, Junhao & Song, Yixiao & Liu, Qingyuan & Huo, Fulei & Chu, Zhanpeng & Tian, Zhiyong & Fan, Jianhua & Zhang, Ling & Liu, Aihua, 2024. "Multi-segmented tube design and multi-objective optimization of deep coaxial borehole heat exchanger," Renewable Energy, Elsevier, vol. 237(PA).
    • Handle: RePEc:eee:renene:v:237:y:2024:i:pa:s0960148124015623
    DOI: 10.1016/j.renene.2024.121494
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