A simplified approach to predicting the Heat Extraction Rate of Borehole Heat Exchangers from parametric analysis

Tang, Fujiao; Nowamooz, Hossein; Wang, Dawei; Yang, Enhui; Luo, Jun; Wang, Wanli; Tan, Yiqiu

doi:10.1016/j.geothermics.2022.102358

Cited by 5 publications

(1 citation statement)

References 37 publications

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“…Nowadays, the increasingly acute energy shortage and environmental issues have received widespread attention [1]. In the past few decades, many studies on clean energy have been conducted [2,3]. Geothermal energy and solar energy have achieved significant development due to the advantages of wide distribution and large reserves [4,5].…”

Section: Introductionmentioning

confidence: 99%

Performance prediction and analysis of a solar assisted medium-deep geothermal heating system

Zhang,

Tao,

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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The solar assisted medium-deep geothermal heating (SAMGH) system is a novel kind of heating system that can combine the benefits of geothermal and solar energy. However, the variations in borehole heat exchanger (BHE) performance and the intermittency of solar energy pose challenges for predicting the overall performance of the coupled system and designing the operational strategies. To conduct simulation on the SAMGH system for performance prediction and analysis, a coaxial medium-deep borehole heat exchanger coupled with the solar energy heating system for an office building in Xi’an was developed. The TRNSYS software was employed to establish the model of the coupled system. A ground source heat pump (GSHP) heating system was used for comparison. The simulation results showed that with the introduction of the solar energy and heat storage modules, the annual operating time of the geothermal system only accounts for 32.06%. The energy consumption of the coupled system can be reduced from 63585 kW to 44586 kW, and the energy consumption proportion of the geothermal system in total value decreased from 69.10% to 40.58%. Therefore, the average coefficient of performance (COP) of the heat pump and the system were improved by 63.71% and 91.77%, respectively. Moreover, because the solar energy is beneficial to the ground heat recovery, the average ground temperature increased from 42.5 °C to 43.88 °C after ten years of operation. The proposed design method and simulation results can serve as a reference for design method and performance analysis of the geothermal and solar coupled system.

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