ANALYTICAL MODEL OF COAXIAL BOREHOLE HEATEXCHANGER BASED ON SEGMENTATION METHOD

Huang Xianwen; Yao Zhishu; Xue Weipei; Cai Haibing; Liu Xiaohu

doi:10.19912/j.0254-0096.tynxb.2020-0897

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (4) : 95-103. DOI: 10.19912/j.0254-0096.tynxb.2020-0897

Topics on Key Technologies for Safety of Electrochemical Energy Storage Systems and Echelon Utilization of Decommissioned Power Batteries

ANALYTICAL MODEL OF COAXIAL BOREHOLE HEATEXCHANGER BASED ON SEGMENTATION METHOD

Huang Xianwen, Yao Zhishu, Xue Weipei, Cai Haibing, Liu Xiaohu

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Abstract

In order to optimize the design of Coaxial Borehole Heat Exchanger （CBHE）, based on the segmentation method, an analytical model of the CBHE was proposed. In the analytical model, according to the "thermal resistance theory" and "line-source theory", the internal and external heat transfer models of the borehole were constructed respectively, and the 3D CBHE analytical model was constructed based on the " segmentation method" and "time superposition theory". The calculation results of the analytical model were compared with the numerical analysis results and test resnlts, which verified the rationality of the analytical model. Based on the analytical model, the influence of the non-uniform distribution of soil thermal conductivity on the heat transfer effect of CBHE is studied. The results show that the heat transfer efficiency for soil with homogenization thermal conductivity is higher than that of soil with gradient thermal conductivity, and this tendency increases with the increase of the thermal conductivity change amplitude; which means that the non-uniformity of soil thermal conductivity should be considered when evaluating the heat transfer efficiency of CBHE.

Key words

heat pump system / heat exchanger / analytical model / optimization design / thermal conductivity

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Huang Xianwen, Yao Zhishu, Xue Weipei, Cai Haibing, Liu Xiaohu. ANALYTICAL MODEL OF COAXIAL BOREHOLE HEATEXCHANGER BASED ON SEGMENTATION METHOD[J]. Acta Energiae Solaris Sinica. 2022, 43(4): 95-103 https://doi.org/10.19912/j.0254-0096.tynxb.2020-0897

References

[1] ARESTI L, CHRISTODOULIDES P, FLORIDES G.A review of the design aspects of ground heat exchangers[J]. Renewable and sustainable energy reviews, 2018, 92: 757-773.
[2] JAVADI H, MOUSAVI S S, ROSEN M A, et al. Performance of ground heat exchangers: A comprehensive review of recent advances[J]. Energy, 2019, 178: 207-233.
[3] YAMANLAR S, KORKMAZ E D, SERPEN U.Assessment of geothermal power potential in Buyuk Menderes basin, Turkey[J]. Geothermics, 2020, 88: 101912.
[4] 刁乃仁, 方肇洪.地理管地源热泵技术[M]. 北京: 高等教育出版社, 2006.
DIAO N R, FANG Z H.Ground source heat pump technology of buried-pipes[M]. Beijing: Higher Education Press, 2006.
[5] MENG X W, HAN Z W, HU H H, et al. Studies on the performance of ground source heat pump affected by soil freezing under groundwater seepage[J]. Journal of building engineering, 2021, 33: 101632.
[6] CUI Y L, ZHU J, TWAHA S, et al. A comprehensive review on 2D and 3D models of vertical ground heat exchangers[J]. Renewable and sustainable energy reviews, 2018, 94: 84-114.
[7] LUO Y, GUO H, MEGGERS F, et al. Deep coaxial borehole heat exchanger: Analytical modeling and thermal analysis[J]. Energy, 2019, 185: 1298-1313.
[8] 刁乃仁, 曾和义, 方肇洪.竖直U型管地热换热器的准三维传热模型[J]. 热能动力工程, 2003, 18(4): 387-390.
DIAO N R, ZENG, H Y, FANG Z H.A quasi three-dimensional heat transfer model for vertical u-tube geothermal heat exchangers[J]. Journal of engineering for thermal energy and power, 2003, 18(4): 387-390.
[9] LI M, MA L, XU W J, et al. Multi-external-chamber coaxial borehole heat exchanger: Dynamic heat transfer and energy consumption analysis[J]. Energy conversion and management, 2020, 207: 112519.
[10] 李旻, 刁乃仁, 方肇洪.单井回灌地源热泵地下传热数值模型研究[J]. 太阳能学报, 2007, 28(12): 1394-1401.
LI M, DIAO N R, FANG Z H.Study on numerical heat transfer models of standing column well[J]. Acta energiae solaris sinica, 2007, 28(12): 1394-1401.
[11] HU X C, BANKS J, WU L P, et al. Numerical modeling of a coaxial borehole heat exchanger to exploit geothermal energy from abandoned petroleum wells in hinton, alberta[J]. Renewable energy, 2020, 148: 1110-1123.
[12] 申思, 官燕玲.地埋管换热器Delaunay三维非结构化网格的方法研究[J]. 太阳能学报, 2017, 38(1): 119-126.
SHEN S, GUAN Y L.Method research on delaunaythree-dimensional unstructured grid of ground heat exchangers[J]. Acta energiae solaris sinica, 2017, 38(1): 119-126.
[13] CIMMINO M, BERNIER M, ADAMS F.A contribution towards the determination of G-functions using the finite line source[J]. Applied thermal engineering, 2013, 51(1-2): 401-412.
[14] PAN A Q, LU L, CUI P, et al. A new analytical heat transfer model for deep borehole heat exchangers with coaxial tubes[J]. International journal of heat and mass transfer, 2019, 141: 1056-1065.
[15] 杨卫波, 施明恒, 陈振乾.基于准三维模型的垂直U型埋管换热特性影响因素的分析[J]. 流体机械, 2012, 40(4): 56-62.
YANG W B, SHI M H, CHEN Z Q.Analysis on influence factors of heat exchange characteristics of vertical U-bend ground heat exchanger based on quasi-three dimensional model[J]. Fluid machinery, 2012, 40(4): 56-62.
[16] 张兵兵, 刁乃仁, 方亮.套管式地埋管换热器温度分布及换热性能计算[J]. 煤气与热力, 2019, 39(4): 21-27.
ZHANG B B, DIAO N R, FANG L.Calculation of temperature distribution and heat exchange performance of casing-type buried tube heat exchanger[J]. Gas and heat, 2019, 39(4): 21-27.
[17] BEIER R A, ACUÑA J, MOGENSEN P, et al. Transient heat transfer in a coaxial borehole heat exchanger[J]. Geothermics, 2014, 51: 470-482.
[18] LI C, GUAN Y L, YANG R T, et al. Effect of inner pipe type on the heat transfer performance of deep-buried coaxial double-pipe heat exchangers[J]. Renewable energy, 2020, 145: 1049-1060.
[19] 杨卫波.土壤源热泵技术及应用[M]. 北京: 化学工业出版社, 2015.
YANG W B.Ground source heat pump technology and application[M]. Beijing: Chemical Industry Press, 2015.
[20] 杨卫波, 施明恒.基于线热源理论的垂直U型埋管换热器传热模型的研究[J]. 太阳能学报, 2007, 28(5): 482-488.
YANG W B, SHI M H.Study on heat transfer model of vertical U-tube ground heat exchangers based on line heat source theory[J]. Acta energiae solaris sinica, 2007, 28(5): 482-488.
[21] JAHANBIN A.Thermal performance of the vertical ground heat exchanger with a novel elliptical single U-tube[J]. Geothermics, 2020, 86: 101804.