团队博士贾国圣关于套管式地埋管换热器的研究成果“A finite-volume method for full-scale simulations of coaxial borehole heat exchangers with different structural parameters, geological and operating conditions”发表于能源类TOP期刊Renewable Energy。

Dr. Jiaguosheng published a paper titled “A finite-volume method for full-scale simulations of coaxial borehole heat exchangers with different structural parameters, geological and operating conditions” about the coaxial borehole heat exchanger in Renewable Energy, which is a top journal in the field of energy.

本研究提出了一种针对套管式地埋管换热器的数值计算方法。该算法基于有限体积法的计算思路，针对换热器与岩土的换热过程建立了可变控制体全尺度模型，实现了复杂地质参数及超大管长-管径比换热器在不同换热器参数、不同地质参数及系统连续运行、间歇运行情况下的实时性能快速预测。经过与47.2m、879.6m及2600m地埋管换热器的实测结果对比，该算法能够准确预测不同深度套管式地埋管换热器在不同运行工况下的换热性能。针对影响因素的分析表明，间断运行的模式有助于提高系统性能，当系统每日运行时间由16小时降低至8小时时，一个采暖季内的平均取热功率可由396kW提升至567kW。该算法能够为实际工程中的地埋管设计提供指导，有助于完善地热能理论体系，降低施工成本，提高运行效率。

This study presented a numerical simulation method for the coaxial borehole heat exchangers (BHEs). Based on the finite-volume method, a variable control volume model was established for the full-scale simulation of BHEs. The method can be used to predict the BHE performance under different structural parameters, geological parameters and operating modes with high efficiency and accuracy. The solution method was validated using data collected from three wells of 47.2 m, 879.6 m and 2,600.0 m depths. The comparisons showed that the present method can accurately predict the BHE performance. The operating mode has a nonnegligible effect on the system performance. As the operating time per day reduces from 16 h to 8 h, the average heat exchange rate over 3,000 h increases from 396 kW to 567 kW. The proposed method can provide guidance for the design of the BHEs in the practical engineering. It is conducive to enriching the geothermal theory, saving the initial cost and improve the system efficiency.

论文链接：http://doi.org/10.1016/j.renene.2021.10.017